Only automatically load page for UserPage if username param is present

This avoid issues with SettingsPage
Remove redundant code from IndexPage oninit
2025-08-13 20:04:24 +02:00 · 2020-10-04 22:02:16 -04:00 · 2020-10-04 22:00:11 -04:00 · 2020-10-04 21:49:51 -04:00 · 2020-10-04 16:11:39 -04:00 · 2020-10-03 22:48:56 +00:00
460 changed files with 13173 additions and 9378 deletions
--- a/.gitattributes
+++ b/.gitattributes
@@ -11,3 +11,5 @@ phpunit.xml export-ignore
 tests export-ignore

 js/dist/* -diff
+
+* text=auto eol=lf
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,31 @@
+name: Lint
+
+on:
+  push:
+    paths:
+      - 'js/src/**'
+  pull_request:
+    paths:
+      - 'js/src/**'
+
+jobs:
+  prettier:
+    runs-on: ubuntu-latest
+
+    name: JS / Prettier
+
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: "12"
+
+      - name: Install JS dependencies
+        run: npm ci
+        working-directory: ./js
+
+      - name: Check JS code for formatting
+        run: node_modules/.bin/prettier --check src
+        working-directory: ./js
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,7 +8,7 @@ jobs:

    strategy:
      matrix:
-        php: [7.1, 7.2, 7.3]
+        php: [7.2, 7.3, 7.4]
        service: ['mysql:5.7', mariadb]
        prefix: ['', flarum_]

@@ -21,16 +21,16 @@ jobs:
            prefixStr: (prefix)

        exclude:
-          - php: 7.1
+          - php: 7.2
            service: 'mysql:5.7'
            prefix: flarum_
-          - php: 7.1
+          - php: 7.2
            service: mariadb
            prefix: flarum_
-          - php: 7.2
+          - php: 7.3
            service: 'mysql:5.7'
            prefix: flarum_
-          - php: 7.2
+          - php: 7.3
            service: mariadb
            prefix: flarum_

@@ -49,7 +49,9 @@ jobs:
        run: sudo update-alternatives --set php $(which php${{ matrix.php }})

      - name: Create MySQL Database
-        run: mysql -uroot -proot -e 'CREATE DATABASE flarum_test;' --port 13306
+        run: |
+          sudo systemctl start mysql
+          mysql -uroot -proot -e 'CREATE DATABASE flarum_test;' --port 13306

      - name: Install Composer dependencies
        run: composer install
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,86 @@
 # Changelog

+## [0.1.0-beta.13](https://github.com/flarum/core/compare/v0.1.0-beta.12...v0.1.0-beta.13)
+
+### Added
+- Console extender (#2057)
+- CSRF extender (#2095)
+- Event extender (#2097)
+- Mail extender (#2012)
+- Model extender (#2100)
+- Posts by users that started a discussion now have the CSS class `.Post--by-start-user`
+- PHPUnit 8 compatibility
+- Composer 2 compatibility
+- Permission groups can now be hidden (#2129)
+- Confirmation popup when hiding or deleting posts (#2135)
+
+### Changed
+- Updated less.php dependency version to 3.0
+- Updated JS dependencies
+- All notifications and other emails now processed through the queue, if enabled (#978, #1928, #1931, #2096)
+- Simplified uploads, removing need to store intermediate files (#2117)
+- Improved date handling for dates older than 1 year (#2034)
+- Linting and automatic formatting for JS (#2099)
+- Translation files from Language Packs are only loaded for extensions that are enabled (#2020)
+- PHP extenders' properties are now `private` instead of `protected`, intentionally making it harder to extend these classes (#1958)
+- Preparation for upgrading Laravel components to 5.8 and then 6.0 (#2055, #2117)
+- Allowed permission checks based on model classes in addition to instances (#1977)
+
+### Fixed
+- Users can no longer restore discussions hidden by admins (#2037)
+- Issues of the Modal not showing or auto hiding (#1504, #1813, #2080)
+- Columnar layout on admin extensions page was broken in Firefox (#2029, #2111)
+- Non-dismissible modals could still be dismissed using the ESC key (#1917)
+- New discussions were added to the discussion list above unread sticky posts (#1751, #1868)
+- New discussions not visible to users when using Pusher (#2076, #2077)
+- Permission icons were aligned unevenly in admin permissions list (#2016, #2018)
+- Notification bubble not inversed on mobile with colored header (#1983, #2109)
+- Post stream scrubber clicks jumped back to first post (#1945)
+- Loading state of Switch toggle component was hard to see (#2039, #1491)
+- `Flarum\Extend\Middleware`: The methods `insertBefore()` and `insertAfter()` did not work as described (#2063, #2084)
+
+### Removed
+- Support for PHP 7.1 (#2014)
+- Zend compatibility bridge (#2010)
+- SES mail support (#2011)
+- Backward compatibility layer for `Flarum\Mail\DriverInterface`, new methods from beta.12 are now required
+- `Flarum\Util\Str` helper class
+- `Flarum\Event\ConfigureMiddleware` event 
+
+### Deprecated
+- `Flarum\Event\AbstractConfigureRoutes` event class
+- `Flarum\Event\ConfigureApiRoutes` event class
+- `Flarum\Event\ConfigureForumRoutes` event class
+- `Flarum\Event\ConfigureLocales` event class
+
+## [0.1.0-beta.12](https://github.com/flarum/core/compare/v0.1.0-beta.11.1...v0.1.0-beta.12)
+
+### Added
+- Full support for PHP 7.4 (#1980)
+- Mail settings: Configure region for the Mailgun driver (#1834, #1850)
+- Mail settings: Alert admins about incomplete settings (#1763, #1921)
+- New permission that allows users to post without throttling (#1255, #1938)
+- Basic transliteration of discussion "slugs" / pretty URLs (#194, #1975)
+- User profiles: Render basic content on server side (#1901)
+- New extender for configuring middleware (#1919, #1952, #1957, #1971)
+- New extender for configuring error handling (#1781, #1970)
+- Automated tests for PHP extenders to guarantee their backwards compatibility
+
+### Changed
+- Profile URLs for non-existing users properly return HTTP 404 (#1846, #1901)
+- Confirmation email subject no longer contains the forum title (#1613)
+- Improved error handling during Flarum's early boot phase (#1607)
+- Updated deprecated "Zend" libraries to their new "Laminas" equivalents (#1963)
+
+### Fixed
+- Update page did not work when installed in subdirectories (#1947)
+- Avatar upload did not work in IE11 / Edge (#1125, #1570)
+- Translation fallback was ignored for client-rendered pages (#1774, #1961)
+- The success alert when posting replies was invisible (#1976)
+
 ## [0.1.0-beta.11.1](https://github.com/flarum/core/compare/v0.1.0-beta.11...v0.1.0-beta.11.1)

 ### Fixed
-
 - Saving custom css in admin failed (#1946)

 ## [0.1.0-beta.11](https://github.com/flarum/core/compare/v0.1.0-beta.10...v0.1.0-beta.11)
--- a/README.md
+++ b/README.md
@@ -1,12 +1,14 @@
-<p align="center"><img src="https://flarum.org/img/logo.png"></p>
+<p align="center"><img src="https://flarum.org/assets/img/logo.png"></p>

 <p align="center">
-<a href="https://travis-ci.org/flarum/core"><img src="https://travis-ci.org/flarum/core.svg" alt="Build Status"></a>
-<a href="https://packagist.org/packages/flarum/core"><img src="https://poser.pugx.org/flarum/core/d/total.svg" alt="Total Downloads"></a>
-<a href="https://packagist.org/packages/flarum/core"><img src="https://poser.pugx.org/flarum/core/v/stable.svg" alt="Latest Stable Version"></a>
-<a href="https://packagist.org/packages/flarum/core"><img src="https://poser.pugx.org/flarum/core/license.svg" alt="License"></a>
+<a href="https://github.com/flarum/core/actions?query=workflow%3ATests"><img src="https://github.com/flarum/core/workflows/Tests/badge.svg" alt="PHP Tests"></a>
+<a href="https://packagist.org/packages/flarum/core"><img src="https://img.shields.io/packagist/dt/flarum/core" alt="Total Downloads"></a>
+<a href="https://packagist.org/packages/flarum/core"><img src="https://img.shields.io/github/v/release/flarum/core?sort=semver" alt="Latest Version"></a>
+<a href="https://packagist.org/packages/flarum/core"><img src="https://img.shields.io/packagist/l/flarum/core" alt="License"></a>
+<a href="https://github.styleci.io/repos/28257573"><img src="https://github.styleci.io/repos/28257573/shield?style=flat" alt="StyleCI"></a>
 </p>

+
 ## About Flarum

 **[Flarum](https://flarum.org/) is a delightfully simple discussion platform for your website.** It's fast and easy to use, with all the features you need to run a successful community. It is designed to be:
@@ -32,4 +34,3 @@ If you discover a security vulnerability within Flarum, please send an e-mail to
 ## License

 Flarum is open-source software licensed under the [MIT License](https://github.com/flarum/flarum/blob/master/LICENSE).
-
--- a/composer.json
+++ b/composer.json
@@ -5,17 +5,28 @@
    "homepage": "https://flarum.org/",
    "license": "MIT",
    "authors": [
-        {
-            "name": "Toby Zerner",
-            "email": "toby.zerner@gmail.com"
-        },
        {
            "name": "Franz Liedke",
            "email": "franz@develophp.org"
        },
        {
-          "name": "Daniel Klabbers",
-          "email": "daniel@klabbers.email"
+            "name": "Daniel Klabbers",
+            "email": "daniel@klabbers.email",
+            "homepage": "https://luceos.com"
+        },
+        {
+            "name": "David Sevilla Martin",
+            "email": "me+flarum@datitisev.me",
+            "homepage": "https://datitisev.me"
+        },
+        {
+            "name": "Clark Winkelmann",
+            "email": "clark.winkelmann@gmail.com",
+            "homepage": "https://clarkwinkelmann.com"
+        },
+        {
+            "name": "Matthew Kilgore",
+            "email": "matthew@kilgore.dev"
        }
    ],
    "support": {
@@ -24,50 +35,50 @@
        "docs": "https://flarum.org/docs/"
    },
    "require": {
-        "php": ">=7.1",
+        "php": ">=7.2",
        "axy/sourcemap": "^0.1.4",
-        "components/font-awesome": "5.9.*",
-        "dflydev/fig-cookies": "^1.0.2",
+        "components/font-awesome": "^5.14.0",
+        "dflydev/fig-cookies": "^2.0.1",
        "doctrine/dbal": "^2.7",
        "franzl/whoops-middleware": "^0.4.0",
-        "illuminate/bus": "5.7.*",
-        "illuminate/cache": "5.7.*",
-        "illuminate/config": "5.7.*",
-        "illuminate/container": "5.7.*",
-        "illuminate/contracts": "5.7.*",
-        "illuminate/database": "5.7.*",
-        "illuminate/events": "5.7.*",
-        "illuminate/filesystem": "5.7.*",
-        "illuminate/hashing": "5.7.*",
-        "illuminate/mail": "5.7.*",
-        "illuminate/queue": "5.7.*",
-        "illuminate/session": "5.7.*",
-        "illuminate/support": "5.7.*",
-        "illuminate/validation": "5.7.*",
-        "illuminate/view": "5.7.*",
-        "intervention/image": "^2.3.0",
+        "illuminate/bus": "^6.0",
+        "illuminate/cache": "^6.0",
+        "illuminate/config": "^6.0",
+        "illuminate/container": "^6.0",
+        "illuminate/contracts": "^6.0",
+        "illuminate/database": "^6.0",
+        "illuminate/events": "^6.0",
+        "illuminate/filesystem": "^6.0",
+        "illuminate/hashing": "^6.0",
+        "illuminate/mail": "^6.0",
+        "illuminate/queue": "^6.0",
+        "illuminate/session": "^6.0",
+        "illuminate/support": "^6.0",
+        "illuminate/validation": "^6.0",
+        "illuminate/view": "^6.0",
+        "intervention/image": "^2.5.0",
        "laminas/laminas-diactoros": "^1.8.4",
        "laminas/laminas-httphandlerrunner": "^1.0",
        "laminas/laminas-stratigility": "^3.0",
-        "laminas/laminas-zendframework-bridge": "^1.0",
        "league/flysystem": "^1.0.11",
        "matthiasmullie/minify": "^1.3",
        "middlewares/base-path": "^1.1",
        "middlewares/base-path-router": "^0.2.1",
        "middlewares/request-handler": "^1.2",
        "monolog/monolog": "^1.16.0",
+        "nesbot/carbon": "^2.0",
        "nikic/fast-route": "^0.6",
-        "oyejorge/less.php": "^1.7",
        "psr/http-message": "^1.0",
        "psr/http-server-handler": "^1.0",
        "psr/http-server-middleware": "^1.0",
-        "s9e/text-formatter": "^1.2.0",
+        "s9e/text-formatter": "^2.3.6",
        "symfony/config": "^3.3",
        "symfony/console": "^4.2",
        "symfony/event-dispatcher": "^4.3.2",
        "symfony/translation": "^3.3",
        "symfony/yaml": "^3.3",
-        "tobscure/json-api": "^0.3.0"
+        "tobscure/json-api": "^0.3.0",
+        "wikimedia/less.php": "^3.0"
    },
    "require-dev": {
        "mockery/mockery": "^1.0",
--- a/js/.prettierrc.json
+++ b/js/.prettierrc.json
@@ -0,0 +1,6 @@
+{
+  "printWidth": 150,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "es5"
+}
--- a/js/dist/admin.js
+++ b/js/dist/admin.js
--- a/js/dist/admin.js.map
+++ b/js/dist/admin.js.map
--- a/js/dist/forum.js
+++ b/js/dist/forum.js
--- a/js/dist/forum.js.map
+++ b/js/dist/forum.js.map
--- a/js/package-lock.json
+++ b/js/package-lock.json
--- a/js/package.json
+++ b/js/package.json
@@ -2,25 +2,38 @@
  "private": true,
  "name": "@flarum/core",
  "dependencies": {
+    "@babel/preset-typescript": "^7.10.1",
+    "@types/mithril": "^2.0.3",
    "bootstrap": "^3.4.1",
    "classnames": "^2.2.5",
    "color-thief-browser": "^2.0.2",
+    "dayjs": "^1.8.28",
    "expose-loader": "^0.7.5",
    "flarum-webpack-config": "0.1.0-beta.10",
    "jquery": "^3.4.1",
    "jquery.hotkeys": "^0.1.0",
    "lodash-es": "^4.17.14",
    "m.attrs.bidi": "github:tobscure/m.attrs.bidi",
-    "mithril": "^0.2.8",
-    "moment": "^2.22.2",
+    "mithril": "^2.0.4",
    "punycode": "^2.1.1",
    "spin.js": "^3.1.0",
-    "webpack": "^4.41.2",
-    "webpack-cli": "^3.1.2",
+    "webpack": "^4.43.0",
+    "webpack-cli": "^3.3.11",
    "webpack-merge": "^4.1.4"
  },
+  "devDependencies": {
+    "husky": "^4.2.5",
+    "prettier": "2.0.2"
+  },
  "scripts": {
    "dev": "webpack --mode development --watch",
-    "build": "webpack --mode production"
+    "build": "webpack --mode production",
+    "format": "prettier --write src",
+    "format-check": "prettier --check src"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "npm run format"
+    }
  }
 }
--- a/js/shims.d.ts
+++ b/js/shims.d.ts
@@ -0,0 +1,32 @@
+// Mithril
+import Mithril from 'mithril';
+
+// Other third-party libs
+import * as _dayjs from 'dayjs';
+import * as _$ from 'jquery';
+
+// Globals from flarum/core
+import Application from './src/common/Application';
+
+/**
+ * flarum/core exposes several extensions globally:
+ *
+ * - jQuery for convenient DOM manipulation
+ * - Mithril for VDOM and components
+ * - dayjs for date/time operations
+ *
+ * Since these are already part of the global namespace, extensions won't need
+ * to (and should not) bundle these themselves.
+ */
+declare global {
+  const $: typeof _$;
+  const m: Mithril.Static;
+  const dayjs: typeof _dayjs;
+}
+
+/**
+ * All global variables owned by flarum/core.
+ */
+declare global {
+  const app: Application;
+}
--- a/js/src/admin/AdminApplication.js
+++ b/js/src/admin/AdminApplication.js
@@ -12,9 +12,9 @@ export default class AdminApplication extends Application {
    canGoBack: () => true,
    getPrevious: () => {},
    backUrl: () => this.forum.attribute('baseUrl'),
-    back: function() {
+    back: function () {
      window.location = this.backUrl();
-    }
+    },
  };

  constructor() {
@@ -27,13 +27,18 @@ export default class AdminApplication extends Application {
   * @inheritdoc
   */
  mount() {
-    m.mount(document.getElementById('app-navigation'), Navigation.component({className: 'App-backControl', drawer: true}));
-    m.mount(document.getElementById('header-navigation'), Navigation.component());
-    m.mount(document.getElementById('header-primary'), HeaderPrimary.component());
-    m.mount(document.getElementById('header-secondary'), HeaderSecondary.component());
-    m.mount(document.getElementById('admin-navigation'), AdminNav.component());
+    m.mount(document.getElementById('app-navigation'), { view: () => Navigation.component({ className: 'App-backControl', drawer: true }) });
+    m.mount(document.getElementById('header-navigation'), Navigation);
+    m.mount(document.getElementById('header-primary'), HeaderPrimary);
+    m.mount(document.getElementById('header-secondary'), HeaderSecondary);
+    m.mount(document.getElementById('admin-navigation'), AdminNav);
+
+    // Mithril does not render the home route on https://example.com/admin, so
+    // we need to go to https://example.com/admin#/ explicitly.
+    if (!document.location.hash) document.location.hash = '#/';
+
+    m.route.prefix = '#';

-    m.route.mode = 'hash';
    super.mount();

    // If an extension has just been enabled, then we will run its settings
@@ -59,5 +64,5 @@ export default class AdminApplication extends Application {
    }

    return required;
-  };
+  }
 }
--- a/js/src/admin/compat.js
+++ b/js/src/admin/compat.js
@@ -6,7 +6,6 @@ import EditCustomFooterModal from './components/EditCustomFooterModal';
 import SessionDropdown from './components/SessionDropdown';
 import HeaderPrimary from './components/HeaderPrimary';
 import AppearancePage from './components/AppearancePage';
-import Page from './components/Page';
 import StatusWidget from './components/StatusWidget';
 import HeaderSecondary from './components/HeaderSecondary';
 import SettingsModal from './components/SettingsModal';
@@ -15,7 +14,6 @@ import AddExtensionModal from './components/AddExtensionModal';
 import ExtensionsPage from './components/ExtensionsPage';
 import AdminLinkButton from './components/AdminLinkButton';
 import PermissionGrid from './components/PermissionGrid';
-import Widget from './components/Widget';
 import MailPage from './components/MailPage';
 import UploadImageButton from './components/UploadImageButton';
 import LoadingModal from './components/LoadingModal';
@@ -37,7 +35,6 @@ export default Object.assign(compat, {
  'components/SessionDropdown': SessionDropdown,
  'components/HeaderPrimary': HeaderPrimary,
  'components/AppearancePage': AppearancePage,
-  'components/Page': Page,
  'components/StatusWidget': StatusWidget,
  'components/HeaderSecondary': HeaderSecondary,
  'components/SettingsModal': SettingsModal,
@@ -46,7 +43,6 @@ export default Object.assign(compat, {
  'components/ExtensionsPage': ExtensionsPage,
  'components/AdminLinkButton': AdminLinkButton,
  'components/PermissionGrid': PermissionGrid,
-  'components/Widget': Widget,
  'components/MailPage': MailPage,
  'components/UploadImageButton': UploadImageButton,
  'components/LoadingModal': LoadingModal,
@@ -58,6 +54,6 @@ export default Object.assign(compat, {
  'components/AdminNav': AdminNav,
  'components/EditCustomCssModal': EditCustomCssModal,
  'components/EditGroupModal': EditGroupModal,
-  'routes': routes,
-  'AdminApplication': AdminApplication
+  routes: routes,
+  AdminApplication: AdminApplication,
 });
--- a/js/src/admin/components/AddExtensionModal.js
+++ b/js/src/admin/components/AddExtensionModal.js
@@ -22,8 +22,10 @@ export default class AddExtensionModal extends Modal {
    return (
      <div className="Modal-body">
        <p>{app.translator.trans('core.admin.add_extension.temporary_text')}</p>
-        <p>{app.translator.trans('core.admin.add_extension.install_text', {a: <a href="https://discuss.flarum.org/t/extensions" target="_blank"/>})}</p>
-        <p>{app.translator.trans('core.admin.add_extension.developer_text', {a: <a href="http://flarum.org/docs/extend" target="_blank"/>})}</p>
+        <p>
+          {app.translator.trans('core.admin.add_extension.install_text', { a: <a href="https://discuss.flarum.org/t/extensions" target="_blank" /> })}
+        </p>
+        <p>{app.translator.trans('core.admin.add_extension.developer_text', { a: <a href="http://flarum.org/docs/extend" target="_blank" /> })}</p>
      </div>
    );
  }
--- a/js/src/admin/components/AdminLinkButton.js
+++ b/js/src/admin/components/AdminLinkButton.js
@@ -10,15 +10,7 @@
 import LinkButton from '../../common/components/LinkButton';

 export default class AdminLinkButton extends LinkButton {
-  getButtonContent() {
-    const content = super.getButtonContent();
-
-    content.push(
-      <div className="AdminLinkButton-description">
-        {this.props.description}
-      </div>
-    );
-
-    return content;
+  getButtonContent(children) {
+    return [...super.getButtonContent(children), <div className="AdminLinkButton-description">{this.attrs.description}</div>];
  }
 }
--- a/js/src/admin/components/AdminNav.js
+++ b/js/src/admin/components/AdminNav.js
@@ -15,9 +15,7 @@ import ItemList from '../../common/utils/ItemList';
 export default class AdminNav extends Component {
  view() {
    return (
-      <SelectDropdown
-        className="AdminNav App-titleControl"
-        buttonClassName="Button">
+      <SelectDropdown className="AdminNav App-titleControl" buttonClassName="Button">
        {this.items().toArray()}
      </SelectDropdown>
    );
@@ -31,47 +29,77 @@ export default class AdminNav extends Component {
  items() {
    const items = new ItemList();

-    items.add('dashboard', AdminLinkButton.component({
-      href: app.route('dashboard'),
-      icon: 'far fa-chart-bar',
-      children: app.translator.trans('core.admin.nav.dashboard_button'),
-      description: app.translator.trans('core.admin.nav.dashboard_text')
-    }));
+    items.add(
+      'dashboard',
+      AdminLinkButton.component(
+        {
+          href: app.route('dashboard'),
+          icon: 'far fa-chart-bar',
+          description: app.translator.trans('core.admin.nav.dashboard_text'),
+        },
+        app.translator.trans('core.admin.nav.dashboard_button')
+      )
+    );

-    items.add('basics', AdminLinkButton.component({
-      href: app.route('basics'),
-      icon: 'fas fa-pencil-alt',
-      children: app.translator.trans('core.admin.nav.basics_button'),
-      description: app.translator.trans('core.admin.nav.basics_text')
-    }));
+    items.add(
+      'basics',
+      AdminLinkButton.component(
+        {
+          href: app.route('basics'),
+          icon: 'fas fa-pencil-alt',
+          description: app.translator.trans('core.admin.nav.basics_text'),
+        },
+        app.translator.trans('core.admin.nav.basics_button')
+      )
+    );

-    items.add('mail', AdminLinkButton.component({
-      href: app.route('mail'),
-      icon: 'fas fa-envelope',
-      children: app.translator.trans('core.admin.nav.email_button'),
-      description: app.translator.trans('core.admin.nav.email_text')
-    }));
+    items.add(
+      'mail',
+      AdminLinkButton.component(
+        {
+          href: app.route('mail'),
+          icon: 'fas fa-envelope',
+          description: app.translator.trans('core.admin.nav.email_text'),
+        },
+        app.translator.trans('core.admin.nav.email_button')
+      )
+    );

-    items.add('permissions', AdminLinkButton.component({
-      href: app.route('permissions'),
-      icon: 'fas fa-key',
-      children: app.translator.trans('core.admin.nav.permissions_button'),
-      description: app.translator.trans('core.admin.nav.permissions_text')
-    }));
+    items.add(
+      'permissions',
+      AdminLinkButton.component(
+        {
+          href: app.route('permissions'),
+          icon: 'fas fa-key',
+          description: app.translator.trans('core.admin.nav.permissions_text'),
+        },
+        app.translator.trans('core.admin.nav.permissions_button')
+      )
+    );

-    items.add('appearance', AdminLinkButton.component({
-      href: app.route('appearance'),
-      icon: 'fas fa-paint-brush',
-      children: app.translator.trans('core.admin.nav.appearance_button'),
-      description: app.translator.trans('core.admin.nav.appearance_text')
-    }));
+    items.add(
+      'appearance',
+      AdminLinkButton.component(
+        {
+          href: app.route('appearance'),
+          icon: 'fas fa-paint-brush',
+          description: app.translator.trans('core.admin.nav.appearance_text'),
+        },
+        app.translator.trans('core.admin.nav.appearance_button')
+      )
+    );

-    items.add('extensions', AdminLinkButton.component({
-      href: app.route('extensions'),
-      icon: 'fas fa-puzzle-piece',
-      children: app.translator.trans('core.admin.nav.extensions_button'),
-      description: app.translator.trans('core.admin.nav.extensions_text')
-    }));
+    items.add(
+      'extensions',
+      AdminLinkButton.component(
+        {
+          href: app.route('extensions'),
+          icon: 'fas fa-puzzle-piece',
+          description: app.translator.trans('core.admin.nav.extensions_text'),
+        },
+        app.translator.trans('core.admin.nav.extensions_button')
+      )
+    );

    return items;
  }
--- a/js/src/admin/components/AppearancePage.js
+++ b/js/src/admin/components/AppearancePage.js
@@ -1,6 +1,7 @@
-import Page from './Page';
+import Page from '../../common/components/Page';
 import Button from '../../common/components/Button';
 import Switch from '../../common/components/Switch';
+import Stream from '../../common/utils/Stream';
 import EditCustomCssModal from './EditCustomCssModal';
 import EditCustomHeaderModal from './EditCustomHeaderModal';
 import EditCustomFooterModal from './EditCustomFooterModal';
@@ -8,13 +9,13 @@ import UploadImageButton from './UploadImageButton';
 import saveSettings from '../utils/saveSettings';

 export default class AppearancePage extends Page {
-  init() {
-    super.init();
+  oninit(vnode) {
+    super.oninit(vnode);

-    this.primaryColor = m.prop(app.data.settings.theme_primary_color);
-    this.secondaryColor = m.prop(app.data.settings.theme_secondary_color);
-    this.darkMode = m.prop(app.data.settings.theme_dark_mode === '1');
-    this.coloredHeader = m.prop(app.data.settings.theme_colored_header === '1');
+    this.primaryColor = Stream(app.data.settings.theme_primary_color);
+    this.secondaryColor = Stream(app.data.settings.theme_secondary_color);
+    this.darkMode = Stream(app.data.settings.theme_dark_mode);
+    this.coloredHeader = Stream(app.data.settings.theme_colored_header);
  }

  view() {
@@ -24,86 +25,86 @@ export default class AppearancePage extends Page {
          <form onsubmit={this.onsubmit.bind(this)}>
            <fieldset className="AppearancePage-colors">
              <legend>{app.translator.trans('core.admin.appearance.colors_heading')}</legend>
-              <div className="helpText">
-                {app.translator.trans('core.admin.appearance.colors_text')}
-              </div>
+              <div className="helpText">{app.translator.trans('core.admin.appearance.colors_text')}</div>

              <div className="AppearancePage-colors-input">
-                <input className="FormControl" type="text" placeholder="#aaaaaa" value={this.primaryColor()} onchange={m.withAttr('value', this.primaryColor)}/>
-                <input className="FormControl" type="text" placeholder="#aaaaaa" value={this.secondaryColor()} onchange={m.withAttr('value', this.secondaryColor)}/>
+                <input className="FormControl" type="text" placeholder="#aaaaaa" bidi={this.primaryColor} />
+                <input className="FormControl" type="text" placeholder="#aaaaaa" bidi={this.secondaryColor} />
              </div>

-              {Switch.component({
-                state: this.darkMode(),
-                children: app.translator.trans('core.admin.appearance.dark_mode_label'),
-                onchange: this.darkMode
-              })}
+              {Switch.component(
+                {
+                  state: this.darkMode(),
+                  onchange: this.darkMode,
+                },
+                app.translator.trans('core.admin.appearance.dark_mode_label')
+              )}

-              {Switch.component({
-                state: this.coloredHeader(),
-                children: app.translator.trans('core.admin.appearance.colored_header_label'),
-                onchange: this.coloredHeader
-              })}
+              {Switch.component(
+                {
+                  state: this.coloredHeader(),
+                  onchange: this.coloredHeader,
+                },
+                app.translator.trans('core.admin.appearance.colored_header_label')
+              )}

-              {Button.component({
-                className: 'Button Button--primary',
-                type: 'submit',
-                children: app.translator.trans('core.admin.appearance.submit_button'),
-                loading: this.loading
-              })}
+              {Button.component(
+                {
+                  className: 'Button Button--primary',
+                  type: 'submit',
+                  loading: this.loading,
+                },
+                app.translator.trans('core.admin.appearance.submit_button')
+              )}
            </fieldset>
          </form>

          <fieldset>
            <legend>{app.translator.trans('core.admin.appearance.logo_heading')}</legend>
-            <div className="helpText">
-              {app.translator.trans('core.admin.appearance.logo_text')}
-            </div>
-            <UploadImageButton name="logo"/>
+            <div className="helpText">{app.translator.trans('core.admin.appearance.logo_text')}</div>
+            <UploadImageButton name="logo" />
          </fieldset>

          <fieldset>
            <legend>{app.translator.trans('core.admin.appearance.favicon_heading')}</legend>
-            <div className="helpText">
-              {app.translator.trans('core.admin.appearance.favicon_text')}
-            </div>
-            <UploadImageButton name="favicon"/>
+            <div className="helpText">{app.translator.trans('core.admin.appearance.favicon_text')}</div>
+            <UploadImageButton name="favicon" />
          </fieldset>

          <fieldset>
            <legend>{app.translator.trans('core.admin.appearance.custom_header_heading')}</legend>
-            <div className="helpText">
-              {app.translator.trans('core.admin.appearance.custom_header_text')}
-            </div>
-            {Button.component({
-              className: 'Button',
-              children: app.translator.trans('core.admin.appearance.edit_header_button'),
-              onclick: () => app.modal.show(new EditCustomHeaderModal())
-            })}
+            <div className="helpText">{app.translator.trans('core.admin.appearance.custom_header_text')}</div>
+            {Button.component(
+              {
+                className: 'Button',
+                onclick: () => app.modal.show(EditCustomHeaderModal),
+              },
+              app.translator.trans('core.admin.appearance.edit_header_button')
+            )}
          </fieldset>

          <fieldset>
            <legend>{app.translator.trans('core.admin.appearance.custom_footer_heading')}</legend>
-            <div className="helpText">
-              {app.translator.trans('core.admin.appearance.custom_footer_text')}
-            </div>
-            {Button.component({
-              className: 'Button',
-              children: app.translator.trans('core.admin.appearance.edit_footer_button'),
-              onclick: () => app.modal.show(new EditCustomFooterModal())
-            })}
+            <div className="helpText">{app.translator.trans('core.admin.appearance.custom_footer_text')}</div>
+            {Button.component(
+              {
+                className: 'Button',
+                onclick: () => app.modal.show(EditCustomFooterModal),
+              },
+              app.translator.trans('core.admin.appearance.edit_footer_button')
+            )}
          </fieldset>

          <fieldset>
            <legend>{app.translator.trans('core.admin.appearance.custom_styles_heading')}</legend>
-            <div className="helpText">
-              {app.translator.trans('core.admin.appearance.custom_styles_text')}
-            </div>
-            {Button.component({
-              className: 'Button',
-              children: app.translator.trans('core.admin.appearance.edit_css_button'),
-              onclick: () => app.modal.show(new EditCustomCssModal())
-            })}
+            <div className="helpText">{app.translator.trans('core.admin.appearance.custom_styles_text')}</div>
+            {Button.component(
+              {
+                className: 'Button',
+                onclick: () => app.modal.show(EditCustomCssModal),
+              },
+              app.translator.trans('core.admin.appearance.edit_css_button')
+            )}
          </fieldset>
        </div>
      </div>
@@ -126,7 +127,7 @@ export default class AppearancePage extends Page {
      theme_primary_color: this.primaryColor(),
      theme_secondary_color: this.secondaryColor(),
      theme_dark_mode: this.darkMode(),
-      theme_colored_header: this.coloredHeader()
+      theme_colored_header: this.coloredHeader(),
    }).then(() => window.location.reload());
  }
 }
--- a/js/src/admin/components/BasicsPage.js
+++ b/js/src/admin/components/BasicsPage.js
@@ -1,15 +1,16 @@
-import Page from './Page';
+import Page from '../../common/components/Page';
 import FieldSet from '../../common/components/FieldSet';
 import Select from '../../common/components/Select';
 import Button from '../../common/components/Button';
-import Alert from '../../common/components/Alert';
 import saveSettings from '../utils/saveSettings';
 import ItemList from '../../common/utils/ItemList';
 import Switch from '../../common/components/Switch';
+import Stream from '../../common/utils/Stream';
+import withAttr from '../../common/utils/withAttr';

 export default class BasicsPage extends Page {
-  init() {
-    super.init();
+  oninit(vnode) {
+    super.oninit(vnode);

    this.loading = false;

@@ -20,12 +21,13 @@ export default class BasicsPage extends Page {
      'show_language_selector',
      'default_route',
      'welcome_title',
-      'welcome_message'
+      'welcome_message',
+      'display_name_driver',
    ];
    this.values = {};

    const settings = app.data.settings;
-    this.fields.forEach(key => this.values[key] = m.prop(settings[key]));
+    this.fields.forEach((key) => (this.values[key] = Stream(settings[key])));

    this.localeOptions = {};
    const locales = app.data.locales;
@@ -33,7 +35,15 @@ export default class BasicsPage extends Page {
      this.localeOptions[i] = `${locales[i]} (${i})`;
    }

-    if (typeof this.values.show_language_selector() !== "number") this.values.show_language_selector(1);
+    this.displayNameOptions = {};
+    const displayNameDrivers = app.data.displayNameDrivers;
+    displayNameDrivers.forEach(function (identifier) {
+      this.displayNameOptions[identifier] = identifier;
+    }, this);
+
+    if (!this.values.display_name_driver() && displayNameDrivers.includes('username')) this.values.display_name_driver('username');
+
+    if (typeof this.values.show_language_selector() !== 'number') this.values.show_language_selector(1);
  }

  view() {
@@ -41,78 +51,107 @@ export default class BasicsPage extends Page {
      <div className="BasicsPage">
        <div className="container">
          <form onsubmit={this.onsubmit.bind(this)}>
-            {FieldSet.component({
-              label: app.translator.trans('core.admin.basics.forum_title_heading'),
-              children: [
-                <input className="FormControl" value={this.values.forum_title()} oninput={m.withAttr('value', this.values.forum_title)}/>
-              ]
-            })}
+            {FieldSet.component(
+              {
+                label: app.translator.trans('core.admin.basics.forum_title_heading'),
+              },
+              [<input className="FormControl" bidi={this.values.forum_title} />]
+            )}

-            {FieldSet.component({
-              label: app.translator.trans('core.admin.basics.forum_description_heading'),
-              children: [
-                <div className="helpText">
-                  {app.translator.trans('core.admin.basics.forum_description_text')}
-                </div>,
-                <textarea className="FormControl" value={this.values.forum_description()} oninput={m.withAttr('value', this.values.forum_description)}/>
+            {FieldSet.component(
+              {
+                label: app.translator.trans('core.admin.basics.forum_description_heading'),
+              },
+              [
+                <div className="helpText">{app.translator.trans('core.admin.basics.forum_description_text')}</div>,
+                <textarea className="FormControl" bidi={this.values.forum_description} />,
              ]
-            })}
+            )}

            {Object.keys(this.localeOptions).length > 1
-              ? FieldSet.component({
-                label: app.translator.trans('core.admin.basics.default_language_heading'),
-                children: [
-                  Select.component({
-                    options: this.localeOptions,
-                    value: this.values.default_locale(),
-                    onchange: this.values.default_locale
-                  }),
-                  Switch.component({
-                    state: this.values.show_language_selector(),
-                    onchange: this.values.show_language_selector,
-                    children: app.translator.trans('core.admin.basics.show_language_selector_label'),
-                  })
-                ]
-              })
+              ? FieldSet.component(
+                  {
+                    label: app.translator.trans('core.admin.basics.default_language_heading'),
+                  },
+                  [
+                    Select.component({
+                      options: this.localeOptions,
+                      value: this.values.default_locale(),
+                      onchange: this.values.default_locale,
+                    }),
+                    Switch.component(
+                      {
+                        state: this.values.show_language_selector(),
+                        onchange: this.values.show_language_selector,
+                      },
+                      app.translator.trans('core.admin.basics.show_language_selector_label')
+                    ),
+                  ]
+                )
              : ''}

-            {FieldSet.component({
-              label: app.translator.trans('core.admin.basics.home_page_heading'),
-              className: 'BasicsPage-homePage',
-              children: [
-                <div className="helpText">
-                  {app.translator.trans('core.admin.basics.home_page_text')}
-                </div>,
-                this.homePageItems().toArray().map(({path, label}) =>
-                  <label className="checkbox">
-                    <input type="radio" name="homePage" value={path} checked={this.values.default_route() === path} onclick={m.withAttr('value', this.values.default_route)}/>
-                    {label}
-                  </label>
-                )
+            {FieldSet.component(
+              {
+                label: app.translator.trans('core.admin.basics.home_page_heading'),
+                className: 'BasicsPage-homePage',
+              },
+              [
+                <div className="helpText">{app.translator.trans('core.admin.basics.home_page_text')}</div>,
+                this.homePageItems()
+                  .toArray()
+                  .map(({ path, label }) => (
+                    <label className="checkbox">
+                      <input
+                        type="radio"
+                        name="homePage"
+                        value={path}
+                        checked={this.values.default_route() === path}
+                        onclick={withAttr('value', this.values.default_route)}
+                      />
+                      {label}
+                    </label>
+                  )),
              ]
-            })}
+            )}

-            {FieldSet.component({
-              label: app.translator.trans('core.admin.basics.welcome_banner_heading'),
-              className: 'BasicsPage-welcomeBanner',
-              children: [
-                <div className="helpText">
-                  {app.translator.trans('core.admin.basics.welcome_banner_text')}
-                </div>,
+            {FieldSet.component(
+              {
+                label: app.translator.trans('core.admin.basics.welcome_banner_heading'),
+                className: 'BasicsPage-welcomeBanner',
+              },
+              [
+                <div className="helpText">{app.translator.trans('core.admin.basics.welcome_banner_text')}</div>,
                <div className="BasicsPage-welcomeBanner-input">
-                  <input className="FormControl" value={this.values.welcome_title()} oninput={m.withAttr('value', this.values.welcome_title)}/>
-                  <textarea className="FormControl" value={this.values.welcome_message()} oninput={m.withAttr('value', this.values.welcome_message)}/>
-                </div>
+                  <input className="FormControl" bidi={this.values.welcome_title} />
+                  <textarea className="FormControl" bidi={this.values.welcome_message} />
+                </div>,
              ]
-            })}
+            )}

-            {Button.component({
-              type: 'submit',
-              className: 'Button Button--primary',
-              children: app.translator.trans('core.admin.basics.submit_button'),
-              loading: this.loading,
-              disabled: !this.changed()
-            })}
+            {Object.keys(this.displayNameOptions).length > 1
+              ? FieldSet.component(
+                  {
+                    label: app.translator.trans('core.admin.basics.display_name_heading'),
+                  },
+                  [
+                    <div className="helpText">{app.translator.trans('core.admin.basics.display_name_text')}</div>,
+                    Select.component({
+                      options: this.displayNameOptions,
+                      bidi: this.values.display_name_driver,
+                    }),
+                  ]
+                )
+              : ''}
+
+            {Button.component(
+              {
+                type: 'submit',
+                className: 'Button Button--primary',
+                loading: this.loading,
+                disabled: !this.changed(),
+              },
+              app.translator.trans('core.admin.basics.submit_button')
+            )}
          </form>
        </div>
      </div>
@@ -120,7 +159,7 @@ export default class BasicsPage extends Page {
  }

  changed() {
-    return this.fields.some(key => this.values[key]() !== app.data.settings[key]);
+    return this.fields.some((key) => this.values[key]() !== app.data.settings[key]);
  }

  /**
@@ -135,7 +174,7 @@ export default class BasicsPage extends Page {

    items.add('allDiscussions', {
      path: '/all',
-      label: app.translator.trans('core.admin.basics.all_discussions_label')
+      label: app.translator.trans('core.admin.basics.all_discussions_label'),
    });

    return items;
@@ -151,11 +190,11 @@ export default class BasicsPage extends Page {

    const settings = {};

-    this.fields.forEach(key => settings[key] = this.values[key]());
+    this.fields.forEach((key) => (settings[key] = this.values[key]()));

    saveSettings(settings)
      .then(() => {
-        app.alerts.show(this.successAlert = new Alert({type: 'success', children: app.translator.trans('core.admin.basics.saved_message')}));
+        this.successAlert = app.alerts.show({ type: 'success' }, app.translator.trans('core.admin.basics.saved_message'));
      })
      .catch(() => {})
      .then(() => {
--- a/js/src/admin/components/DashboardPage.js
+++ b/js/src/admin/components/DashboardPage.js
@@ -1,18 +1,16 @@
-import Page from './Page';
+import Page from '../../common/components/Page';
 import StatusWidget from './StatusWidget';

 export default class DashboardPage extends Page {
  view() {
    return (
      <div className="DashboardPage">
-        <div className="container">
-          {this.availableWidgets()}
-        </div>
+        <div className="container">{this.availableWidgets()}</div>
      </div>
    );
  }

  availableWidgets() {
-    return [<StatusWidget/>];
+    return [<StatusWidget />];
  }
 }
--- a/js/src/admin/components/DashboardWidget.js
+++ b/js/src/admin/components/DashboardWidget.js
@@ -1,21 +1,8 @@
-/*
- * This file is part of Flarum.
- *
- * (c) Toby Zerner <toby.zerner@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
 import Component from '../../common/Component';

-export default class Widget extends Component {
+export default class DashboardWidget extends Component {
  view() {
-    return (
-      <div className={"Widget "+this.className()}>
-        {this.content()}
-      </div>
-    );
+    return <div className={'DashboardWidget Widget ' + this.className()}>{this.content()}</div>;
  }

  /**
--- a/js/src/admin/components/EditCustomCssModal.js
+++ b/js/src/admin/components/EditCustomCssModal.js
@@ -11,10 +11,14 @@ export default class EditCustomCssModal extends SettingsModal {

  form() {
    return [
-      <p>{app.translator.trans('core.admin.edit_css.customize_text', {a: <a href="https://github.com/flarum/core/tree/master/less" target="_blank"/>})}</p>,
+      <p>
+        {app.translator.trans('core.admin.edit_css.customize_text', {
+          a: <a href="https://github.com/flarum/core/tree/master/less" target="_blank" />,
+        })}
+      </p>,
      <div className="Form-group">
-        <textarea className="FormControl" rows="30" bidi={this.setting('custom_less')}/>
-      </div>
+        <textarea className="FormControl" rows="30" bidi={this.setting('custom_less')} />
+      </div>,
    ];
  }

--- a/js/src/admin/components/EditCustomFooterModal.js
+++ b/js/src/admin/components/EditCustomFooterModal.js
@@ -13,8 +13,8 @@ export default class EditCustomFooterModal extends SettingsModal {
    return [
      <p>{app.translator.trans('core.admin.edit_footer.customize_text')}</p>,
      <div className="Form-group">
-        <textarea className="FormControl" rows="30" bidi={this.setting('custom_footer')}/>
-      </div>
+        <textarea className="FormControl" rows="30" bidi={this.setting('custom_footer')} />
+      </div>,
    ];
  }

--- a/js/src/admin/components/EditCustomHeaderModal.js
+++ b/js/src/admin/components/EditCustomHeaderModal.js
@@ -13,8 +13,8 @@ export default class EditCustomHeaderModal extends SettingsModal {
    return [
      <p>{app.translator.trans('core.admin.edit_header.customize_text')}</p>,
      <div className="Form-group">
-        <textarea className="FormControl" rows="30" bidi={this.setting('custom_header')}/>
-      </div>
+        <textarea className="FormControl" rows="30" bidi={this.setting('custom_header')} />
+      </div>,
    ];
  }

--- a/js/src/admin/components/EditGroupModal.js
+++ b/js/src/admin/components/EditGroupModal.js
@@ -3,19 +3,24 @@ import Button from '../../common/components/Button';
 import Badge from '../../common/components/Badge';
 import Group from '../../common/models/Group';
 import ItemList from '../../common/utils/ItemList';
+import Switch from '../../common/components/Switch';
+import Stream from '../../common/utils/Stream';

 /**
 * The `EditGroupModal` component shows a modal dialog which allows the user
 * to create or edit a group.
 */
 export default class EditGroupModal extends Modal {
-  init() {
-    this.group = this.props.group || app.store.createRecord('groups');
+  oninit(vnode) {
+    super.oninit(vnode);

-    this.nameSingular = m.prop(this.group.nameSingular() || '');
-    this.namePlural = m.prop(this.group.namePlural() || '');
-    this.icon = m.prop(this.group.icon() || '');
-    this.color = m.prop(this.group.color() || '');
+    this.group = this.attrs.group || app.store.createRecord('groups');
+
+    this.nameSingular = Stream(this.group.nameSingular() || '');
+    this.namePlural = Stream(this.group.namePlural() || '');
+    this.icon = Stream(this.group.icon() || '');
+    this.color = Stream(this.group.color() || '');
+    this.isHidden = Stream(this.group.isHidden() || false);
  }

  className() {
@@ -24,21 +29,21 @@ export default class EditGroupModal extends Modal {

  title() {
    return [
-      this.color() || this.icon() ? Badge.component({
-        icon: this.icon(),
-        style: {backgroundColor: this.color()}
-      }) : '',
+      this.color() || this.icon()
+        ? Badge.component({
+            icon: this.icon(),
+            style: { backgroundColor: this.color() },
+          })
+        : '',
      ' ',
-      this.namePlural() || app.translator.trans('core.admin.edit_group.title')
+      this.namePlural() || app.translator.trans('core.admin.edit_group.title'),
    ];
  }

  content() {
    return (
      <div className="Modal-body">
-        <div className="Form">
-          {this.fields().toArray()}
-        </div>
+        <div className="Form">{this.fields().toArray()}</div>
      </div>
    );
  }
@@ -46,40 +51,74 @@ export default class EditGroupModal extends Modal {
  fields() {
    const items = new ItemList();

-    items.add('name', <div className="Form-group">
-      <label>{app.translator.trans('core.admin.edit_group.name_label')}</label>
-      <div className="EditGroupModal-name-input">
-        <input className="FormControl" placeholder={app.translator.trans('core.admin.edit_group.singular_placeholder')} value={this.nameSingular()} oninput={m.withAttr('value', this.nameSingular)}/>
-        <input className="FormControl" placeholder={app.translator.trans('core.admin.edit_group.plural_placeholder')} value={this.namePlural()} oninput={m.withAttr('value', this.namePlural)}/>
-      </div>
-    </div>, 30);
+    items.add(
+      'name',
+      <div className="Form-group">
+        <label>{app.translator.trans('core.admin.edit_group.name_label')}</label>
+        <div className="EditGroupModal-name-input">
+          <input className="FormControl" placeholder={app.translator.trans('core.admin.edit_group.singular_placeholder')} bidi={this.nameSingular} />
+          <input className="FormControl" placeholder={app.translator.trans('core.admin.edit_group.plural_placeholder')} bidi={this.namePlural} />
+        </div>
+      </div>,
+      30
+    );

-    items.add('color', <div className="Form-group">
-      <label>{app.translator.trans('core.admin.edit_group.color_label')}</label>
-      <input className="FormControl" placeholder="#aaaaaa" value={this.color()} oninput={m.withAttr('value', this.color)}/>
-    </div>, 20);
+    items.add(
+      'color',
+      <div className="Form-group">
+        <label>{app.translator.trans('core.admin.edit_group.color_label')}</label>
+        <input className="FormControl" placeholder="#aaaaaa" bidi={this.color} />
+      </div>,
+      20
+    );

-    items.add('icon', <div className="Form-group">
-      <label>{app.translator.trans('core.admin.edit_group.icon_label')}</label>
-      <div className="helpText">
-        {app.translator.trans('core.admin.edit_group.icon_text', {a: <a href="https://fontawesome.com/icons?m=free" tabindex="-1"/>})}
-      </div>
-      <input className="FormControl" placeholder="fas fa-bolt" value={this.icon()} oninput={m.withAttr('value', this.icon)}/>
-    </div>, 10);
+    items.add(
+      'icon',
+      <div className="Form-group">
+        <label>{app.translator.trans('core.admin.edit_group.icon_label')}</label>
+        <div className="helpText">
+          {app.translator.trans('core.admin.edit_group.icon_text', { a: <a href="https://fontawesome.com/icons?m=free" tabindex="-1" /> })}
+        </div>
+        <input className="FormControl" placeholder="fas fa-bolt" bidi={this.icon} />
+      </div>,
+      10
+    );

-    items.add('submit', <div className="Form-group">
-      {Button.component({
-        type: 'submit',
-        className: 'Button Button--primary EditGroupModal-save',
-        loading: this.loading,
-        children: app.translator.trans('core.admin.edit_group.submit_button')
-      })}
-      {this.group.exists && this.group.id() !== Group.ADMINISTRATOR_ID ? (
-        <button type="button" className="Button EditGroupModal-delete" onclick={this.deleteGroup.bind(this)}>
-          {app.translator.trans('core.admin.edit_group.delete_button')}
-        </button>
-      ) : ''}
-    </div>, -10);
+    items.add(
+      'hidden',
+      <div className="Form-group">
+        {Switch.component(
+          {
+            state: !!Number(this.isHidden()),
+            onchange: this.isHidden,
+          },
+          app.translator.trans('core.admin.edit_group.hide_label')
+        )}
+      </div>,
+      10
+    );
+
+    items.add(
+      'submit',
+      <div className="Form-group">
+        {Button.component(
+          {
+            type: 'submit',
+            className: 'Button Button--primary EditGroupModal-save',
+            loading: this.loading,
+          },
+          app.translator.trans('core.admin.edit_group.submit_button')
+        )}
+        {this.group.exists && this.group.id() !== Group.ADMINISTRATOR_ID ? (
+          <button type="button" className="Button EditGroupModal-delete" onclick={this.deleteGroup.bind(this)}>
+            {app.translator.trans('core.admin.edit_group.delete_button')}
+          </button>
+        ) : (
+          ''
+        )}
+      </div>,
+      -10
+    );

    return items;
  }
@@ -89,7 +128,8 @@ export default class EditGroupModal extends Modal {
      nameSingular: this.nameSingular(),
      namePlural: this.namePlural(),
      color: this.color(),
-      icon: this.icon()
+      icon: this.icon(),
+      isHidden: this.isHidden(),
    };
  }

@@ -98,7 +138,8 @@ export default class EditGroupModal extends Modal {

    this.loading = true;

-    this.group.save(this.submitData(), {errorHandler: this.onerror.bind(this)})
+    this.group
+      .save(this.submitData(), { errorHandler: this.onerror.bind(this) })
      .then(this.hide.bind(this))
      .catch(() => {
        this.loading = false;
--- a/js/src/admin/components/ExtensionsPage.js
+++ b/js/src/admin/components/ExtensionsPage.js
@@ -1,13 +1,10 @@
-import Page from './Page';
-import LinkButton from '../../common/components/LinkButton';
+import Page from '../../common/components/Page';
 import Button from '../../common/components/Button';
 import Dropdown from '../../common/components/Dropdown';
-import Separator from '../../common/components/Separator';
 import AddExtensionModal from './AddExtensionModal';
 import LoadingModal from './LoadingModal';
 import ItemList from '../../common/utils/ItemList';
 import icon from '../../common/helpers/icon';
-import listItems from '../../common/helpers/listItems';

 export default class ExtensionsPage extends Page {
  view() {
@@ -15,24 +12,26 @@ export default class ExtensionsPage extends Page {
      <div className="ExtensionsPage">
        <div className="ExtensionsPage-header">
          <div className="container">
-            {Button.component({
-              children: app.translator.trans('core.admin.extensions.add_button'),
-              icon: 'fas fa-plus',
-              className: 'Button Button--primary',
-              onclick: () => app.modal.show(new AddExtensionModal())
-            })}
+            {Button.component(
+              {
+                icon: 'fas fa-plus',
+                className: 'Button Button--primary',
+                onclick: () => app.modal.show(AddExtensionModal),
+              },
+              app.translator.trans('core.admin.extensions.add_button')
+            )}
          </div>
        </div>

        <div className="ExtensionsPage-list">
          <div className="container">
            <ul className="ExtensionList">
-              {Object.keys(app.data.extensions)
-                .map(id => {
-                  const extension = app.data.extensions[id];
-                  const controls = this.controlItems(extension.id).toArray();
+              {Object.keys(app.data.extensions).map((id) => {
+                const extension = app.data.extensions[id];
+                const controls = this.controlItems(extension.id).toArray();

-                  return <li className={'ExtensionListItem ' + (!this.isEnabled(extension.id) ? 'disabled' : '')}>
+                return (
+                  <li className={'ExtensionListItem ' + (!this.isEnabled(extension.id) ? 'disabled' : '')}>
                    <div className="ExtensionListItem-content">
                      <span className="ExtensionListItem-icon ExtensionIcon" style={extension.icon}>
                        {extension.icon ? icon(extension.icon.name) : ''}
@@ -42,21 +41,25 @@ export default class ExtensionsPage extends Page {
                          className="ExtensionListItem-controls"
                          buttonClassName="Button Button--icon Button--flat"
                          menuClassName="Dropdown-menu--right"
-                          icon="fas fa-ellipsis-h">
+                          icon="fas fa-ellipsis-h"
+                        >
                          {controls}
                        </Dropdown>
-                      ) : ''}
+                      ) : (
+                        ''
+                      )}
                      <div className="ExtensionListItem-main">
                        <label className="ExtensionListItem-title">
-                          <input type="checkbox" checked={this.isEnabled(extension.id)} onclick={this.toggle.bind(this, extension.id)}/> {' '}
-                            {extension.extra['flarum-extension'].title}
+                          <input type="checkbox" checked={this.isEnabled(extension.id)} onclick={this.toggle.bind(this, extension.id)} />{' '}
+                          {extension.extra['flarum-extension'].title}
                        </label>
                        <div className="ExtensionListItem-version">{extension.version}</div>
                        <div className="ExtensionListItem-description">{extension.description}</div>
                      </div>
                    </div>
-                  </li>;
-                })}
+                  </li>
+                );
+              })}
            </ul>
          </div>
        </div>
@@ -69,26 +72,38 @@ export default class ExtensionsPage extends Page {
    const enabled = this.isEnabled(name);

    if (app.extensionSettings[name]) {
-      items.add('settings', Button.component({
-        icon: 'fas fa-cog',
-        children: app.translator.trans('core.admin.extensions.settings_button'),
-        onclick: app.extensionSettings[name]
-      }));
+      items.add(
+        'settings',
+        Button.component(
+          {
+            icon: 'fas fa-cog',
+            onclick: app.extensionSettings[name],
+          },
+          app.translator.trans('core.admin.extensions.settings_button')
+        )
+      );
    }

    if (!enabled) {
-      items.add('uninstall', Button.component({
-        icon: 'far fa-trash-alt',
-        children: app.translator.trans('core.admin.extensions.uninstall_button'),
-        onclick: () => {
-          app.request({
-            url: app.forum.attribute('apiUrl') + '/extensions/' + name,
-            method: 'DELETE'
-          }).then(() => window.location.reload());
+      items.add(
+        'uninstall',
+        Button.component(
+          {
+            icon: 'far fa-trash-alt',
+            onclick: () => {
+              app
+                .request({
+                  url: app.forum.attribute('apiUrl') + '/extensions/' + name,
+                  method: 'DELETE',
+                })
+                .then(() => window.location.reload());

-          app.modal.show(new LoadingModal());
-        }
-      }));
+              app.modal.show(LoadingModal);
+            },
+          },
+          app.translator.trans('core.admin.extensions.uninstall_button')
+        )
+      );
    }

    return items;
@@ -103,15 +118,37 @@ export default class ExtensionsPage extends Page {
  toggle(id) {
    const enabled = this.isEnabled(id);

-    app.request({
-      url: app.forum.attribute('apiUrl') + '/extensions/' + id,
-      method: 'PATCH',
-      data: {enabled: !enabled}
-    }).then(() => {
-      if (!enabled) localStorage.setItem('enabledExtension', id);
-      window.location.reload();
-    });
+    app
+      .request({
+        url: app.forum.attribute('apiUrl') + '/extensions/' + id,
+        method: 'PATCH',
+        body: { enabled: !enabled },
+        errorHandler: this.onerror.bind(this),
+      })
+      .then(() => {
+        if (!enabled) localStorage.setItem('enabledExtension', id);
+        window.location.reload();
+      });

-    app.modal.show(new LoadingModal());
+    app.modal.show(LoadingModal);
+  }
+
+  onerror(e) {
+    // We need to give the modal animation time to start; if we close the modal too early,
+    // it breaks the bootstrap modal library.
+    // TODO: This workaround should be removed when we move away from bootstrap JS for modals.
+    setTimeout(() => {
+      app.modal.close();
+
+      const error = JSON.parse(e.responseText).errors[0];
+
+      app.alerts.show(
+        { type: 'error' },
+        app.translator.trans(`core.lib.error.${error.code}_message`, {
+          extension: error.extension,
+          extensions: error.extensions.join(', '),
+        })
+      );
+    }, 250);
  }
 }
--- a/js/src/admin/components/HeaderPrimary.js
+++ b/js/src/admin/components/HeaderPrimary.js
@@ -8,11 +8,7 @@ import listItems from '../../common/helpers/listItems';
 */
 export default class HeaderPrimary extends Component {
  view() {
-    return (
-      <ul className="Header-controls">
-        {listItems(this.items().toArray())}
-      </ul>
-    );
+    return <ul className="Header-controls">{listItems(this.items().toArray())}</ul>;
  }

  config(isInitialized, context) {
--- a/js/src/admin/components/HeaderSecondary.js
+++ b/js/src/admin/components/HeaderSecondary.js
@@ -8,18 +8,7 @@ import listItems from '../../common/helpers/listItems';
 */
 export default class HeaderSecondary extends Component {
  view() {
-    return (
-      <ul className="Header-controls">
-        {listItems(this.items().toArray())}
-      </ul>
-    );
-  }
-
-  config(isInitialized, context) {
-    // Since this component is 'above' the content of the page (that is, it is a
-    // part of the global UI that persists between routes), we will flag the DOM
-    // to be retained across route changes.
-    context.retain = true;
+    return <ul className="Header-controls">{listItems(this.items().toArray())}</ul>;
  }

  /**
--- a/js/src/admin/components/LoadingModal.js
+++ b/js/src/admin/components/LoadingModal.js
@@ -1,9 +1,10 @@
 import Modal from '../../common/components/Modal';

 export default class LoadingModal extends Modal {
-  isDismissible() {
-    return false;
-  }
+  /**
+   * @inheritdoc
+   */
+  static isDismissible = false;

  className() {
    return 'LoadingModal Modal--small';
--- a/js/src/admin/components/MailPage.js
+++ b/js/src/admin/components/MailPage.js
@@ -1,48 +1,56 @@
-import Page from './Page';
+import Page from '../../common/components/Page';
 import FieldSet from '../../common/components/FieldSet';
 import Button from '../../common/components/Button';
 import Alert from '../../common/components/Alert';
 import Select from '../../common/components/Select';
 import LoadingIndicator from '../../common/components/LoadingIndicator';
 import saveSettings from '../utils/saveSettings';
+import Stream from '../../common/utils/Stream';

 export default class MailPage extends Page {
-  init() {
-    super.init();
+  oninit(vnode) {
+    super.oninit(vnode);

-    this.loading = true;
    this.saving = false;
+    this.sendingTest = false;
+    this.refresh();
+  }
+
+  refresh() {
+    this.loading = true;

    this.driverFields = {};
    this.fields = ['mail_driver', 'mail_from'];
    this.values = {};
+    this.status = { sending: false, errors: {} };

    const settings = app.data.settings;
-    this.fields.forEach(key => this.values[key] = m.prop(settings[key]));
+    this.fields.forEach((key) => (this.values[key] = Stream(settings[key])));

-    app.request({
-      method: 'GET',
-      url: app.forum.attribute('apiUrl') + '/mail-drivers'
-    }).then(response => {
-      this.driverFields = response['data'].reduce(
-        (hash, driver) => ({...hash, [driver['id']]: driver['attributes']['fields']}),
-        {}
-      );
+    app
+      .request({
+        method: 'GET',
+        url: app.forum.attribute('apiUrl') + '/mail/settings',
+      })
+      .then((response) => {
+        this.driverFields = response['data']['attributes']['fields'];
+        this.status.sending = response['data']['attributes']['sending'];
+        this.status.errors = response['data']['attributes']['errors'];

-      for (const driver in this.driverFields) {
-        for (const field in this.driverFields[driver]) {
-          this.fields.push(field);
-          this.values[field] = m.prop(settings[field]);
+        for (const driver in this.driverFields) {
+          for (const field in this.driverFields[driver]) {
+            this.fields.push(field);
+            this.values[field] = Stream(settings[field]);
+          }
        }
-      }

-      this.loading = false;
-      m.redraw();
-    });
+        this.loading = false;
+        m.redraw();
+      });
  }

  view() {
-    if (this.loading) {
+    if (this.loading || this.saving) {
      return (
        <div className="MailPage">
          <div className="container">
@@ -52,57 +60,105 @@ export default class MailPage extends Page {
      );
    }

+    const fields = this.driverFields[this.values.mail_driver()];
+    const fieldKeys = Object.keys(fields);
+
    return (
      <div className="MailPage">
        <div className="container">
          <form onsubmit={this.onsubmit.bind(this)}>
            <h2>{app.translator.trans('core.admin.email.heading')}</h2>
-            <div className="helpText">
-              {app.translator.trans('core.admin.email.text')}
-            </div>
+            <div className="helpText">{app.translator.trans('core.admin.email.text')}</div>

-            {FieldSet.component({
-              label: app.translator.trans('core.admin.email.addresses_heading'),
-              className: 'MailPage-MailSettings',
-              children: [
+            {FieldSet.component(
+              {
+                label: app.translator.trans('core.admin.email.addresses_heading'),
+                className: 'MailPage-MailSettings',
+              },
+              [
                <div className="MailPage-MailSettings-input">
-                  <label>{app.translator.trans('core.admin.email.from_label')}</label>
-                  <input className="FormControl" value={this.values.mail_from() || ''} oninput={m.withAttr('value', this.values.mail_from)} />
-                </div>
+                  <label>
+                    {app.translator.trans('core.admin.email.from_label')}
+                    <input className="FormControl" bidi={this.values.mail_from} />
+                  </label>
+                </div>,
              ]
-            })}
+            )}

-            {FieldSet.component({
-              label: app.translator.trans('core.admin.email.driver_heading'),
-              className: 'MailPage-MailSettings',
-              children: [
+            {FieldSet.component(
+              {
+                label: app.translator.trans('core.admin.email.driver_heading'),
+                className: 'MailPage-MailSettings',
+              },
+              [
                <div className="MailPage-MailSettings-input">
-                  <label>{app.translator.trans('core.admin.email.driver_label')}</label>
-                  <Select value={this.values.mail_driver()} options={Object.keys(this.driverFields).reduce((memo, val) => ({...memo, [val]: val}), {})} onchange={this.values.mail_driver} />
-                </div>
+                  <label>
+                    {app.translator.trans('core.admin.email.driver_label')}
+                    <Select
+                      value={this.values.mail_driver()}
+                      options={Object.keys(this.driverFields).reduce((memo, val) => ({ ...memo, [val]: val }), {})}
+                      onchange={this.values.mail_driver}
+                    />
+                  </label>
+                </div>,
              ]
-            })}
+            )}

-            {Object.keys(this.driverFields[this.values.mail_driver()]).length > 0 && FieldSet.component({
-              label: app.translator.trans(`core.admin.email.${this.values.mail_driver()}_heading`),
-              className: 'MailPage-MailSettings',
-              children: [
-                <div className="MailPage-MailSettings-input">
-                  {Object.keys(this.driverFields[this.values.mail_driver()]).map(field => [
-                    <label>{app.translator.trans(`core.admin.email.${field}_label`)}</label>,
-                    this.renderField(field),
-                  ])}
-                </div>
+            {this.status.sending ||
+              Alert.component(
+                {
+                  dismissible: false,
+                },
+                app.translator.trans('core.admin.email.not_sending_message')
+              )}
+
+            {fieldKeys.length > 0 &&
+              FieldSet.component(
+                {
+                  label: app.translator.trans(`core.admin.email.${this.values.mail_driver()}_heading`),
+                  className: 'MailPage-MailSettings',
+                },
+                [
+                  <div className="MailPage-MailSettings-input">
+                    {fieldKeys.map((field) => [
+                      <label>
+                        {app.translator.trans(`core.admin.email.${field}_label`)}
+                        {this.renderField(field)}
+                      </label>,
+                      this.status.errors[field] && <p className="ValidationError">{this.status.errors[field]}</p>,
+                    ])}
+                  </div>,
+                ]
+              )}
+
+            <FieldSet>
+              {Button.component(
+                {
+                  type: 'submit',
+                  className: 'Button Button--primary',
+                  disabled: !this.changed(),
+                },
+                app.translator.trans('core.admin.email.submit_button')
+              )}
+            </FieldSet>
+
+            {FieldSet.component(
+              {
+                label: app.translator.trans('core.admin.email.send_test_mail_heading'),
+                className: 'MailPage-MailSettings',
+              },
+              [
+                <div className="helpText">{app.translator.trans('core.admin.email.send_test_mail_text', { email: app.session.user.email() })}</div>,
+                Button.component(
+                  {
+                    className: 'Button Button--primary',
+                    disabled: this.sendingTest || this.changed(),
+                    onclick: () => this.sendTestEmail(),
+                  },
+                  app.translator.trans('core.admin.email.send_test_mail_button')
+                ),
              ]
-            })}
-
-            {Button.component({
-              type: 'submit',
-              className: 'Button Button--primary',
-              children: app.translator.trans('core.admin.email.submit_button'),
-              loading: this.saving,
-              disabled: !this.changed()
-            })}
+            )}
          </form>
        </div>
      </div>
@@ -115,36 +171,58 @@ export default class MailPage extends Page {
    const prop = this.values[name];

    if (typeof field === 'string') {
-      return <input className="FormControl" value={prop() || ''} oninput={m.withAttr('value', prop)}/>;
+      return <input className="FormControl" bidi={prop} />;
    } else {
      return <Select value={prop()} options={field} onchange={prop} />;
    }
  }

  changed() {
-    return this.fields.some(key => this.values[key]() !== app.data.settings[key]);
+    return this.fields.some((key) => this.values[key]() !== app.data.settings[key]);
+  }
+
+  sendTestEmail() {
+    if (this.saving || this.sendingTest) return;
+
+    this.sendingTest = true;
+    app.alerts.dismiss(this.testEmailSuccessAlert);
+
+    app
+      .request({
+        method: 'POST',
+        url: app.forum.attribute('apiUrl') + '/mail/test',
+      })
+      .then((response) => {
+        this.sendingTest = false;
+        this.testEmailSuccessAlert = app.alerts.show({ type: 'success' }, app.translator.trans('core.admin.email.send_test_mail_success'));
+      })
+      .catch((error) => {
+        this.sendingTest = false;
+        m.redraw();
+        throw error;
+      });
  }

  onsubmit(e) {
    e.preventDefault();

-    if (this.saving) return;
+    if (this.saving || this.sendingTest) return;

    this.saving = true;
    app.alerts.dismiss(this.successAlert);

    const settings = {};

-    this.fields.forEach(key => settings[key] = this.values[key]());
+    this.fields.forEach((key) => (settings[key] = this.values[key]()));

    saveSettings(settings)
      .then(() => {
-        app.alerts.show(this.successAlert = new Alert({type: 'success', children: app.translator.trans('core.admin.basics.saved_message')}));
+        this.successAlert = app.alerts.show({ type: 'success' }, app.translator.trans('core.admin.basics.saved_message'));
      })
      .catch(() => {})
      .then(() => {
        this.saving = false;
-        m.redraw();
+        this.refresh();
      });
  }
 }
--- a/js/src/admin/components/Page.js
+++ b/js/src/admin/components/Page.js
@@ -1,32 +0,0 @@
-import Component from '../../common/Component';
-
-/**
- * The `Page` component
- *
- * @abstract
- */
-export default class Page extends Component {
-  init() {
-    app.previous = app.current;
-    app.current = this;
-
-    app.modal.close();
-
-    /**
-     * A class name to apply to the body while the route is active.
-     *
-     * @type {String}
-     */
-    this.bodyClass = '';
-  }
-
-  config(isInitialized, context) {
-    if (isInitialized) return;
-
-    if (this.bodyClass) {
-      $('#app').addClass(this.bodyClass);
-
-      context.onunload = () => $('#app').removeClass(this.bodyClass);
-    }
-  }
-}
--- a/js/src/admin/components/PermissionDropdown.js
+++ b/js/src/admin/components/PermissionDropdown.js
@@ -8,126 +8,133 @@ import GroupBadge from '../../common/components/GroupBadge';
 function badgeForId(id) {
  const group = app.store.getById('groups', id);

-  return group ? GroupBadge.component({group, label: null}) : '';
+  return group ? GroupBadge.component({ group, label: null }) : '';
 }

 function filterByRequiredPermissions(groupIds, permission) {
-  app.getRequiredPermissions(permission)
-    .forEach(required => {
-      const restrictToGroupIds = app.data.permissions[required] || [];
+  app.getRequiredPermissions(permission).forEach((required) => {
+    const restrictToGroupIds = app.data.permissions[required] || [];

-      if (restrictToGroupIds.indexOf(Group.GUEST_ID) !== -1) {
-        // do nothing
-      } else if (restrictToGroupIds.indexOf(Group.MEMBER_ID) !== -1) {
-        groupIds = groupIds.filter(id => id !== Group.GUEST_ID);
-      } else if (groupIds.indexOf(Group.MEMBER_ID) !== -1) {
-        groupIds = restrictToGroupIds;
-      } else {
-        groupIds = restrictToGroupIds.filter(id => groupIds.indexOf(id) !== -1);
-      }
+    if (restrictToGroupIds.indexOf(Group.GUEST_ID) !== -1) {
+      // do nothing
+    } else if (restrictToGroupIds.indexOf(Group.MEMBER_ID) !== -1) {
+      groupIds = groupIds.filter((id) => id !== Group.GUEST_ID);
+    } else if (groupIds.indexOf(Group.MEMBER_ID) !== -1) {
+      groupIds = restrictToGroupIds;
+    } else {
+      groupIds = restrictToGroupIds.filter((id) => groupIds.indexOf(id) !== -1);
+    }

-      groupIds = filterByRequiredPermissions(groupIds, required);
-    });
+    groupIds = filterByRequiredPermissions(groupIds, required);
+  });

  return groupIds;
 }

 export default class PermissionDropdown extends Dropdown {
-  static initProps(props) {
-    super.initProps(props);
+  static initAttrs(attrs) {
+    super.initAttrs(attrs);

-    props.className = 'PermissionDropdown';
-    props.buttonClassName = 'Button Button--text';
+    attrs.className = 'PermissionDropdown';
+    attrs.buttonClassName = 'Button Button--text';
  }

-  view() {
-    this.props.children = [];
+  view(vnode) {
+    const children = [];

-    let groupIds = app.data.permissions[this.props.permission] || [];
+    let groupIds = app.data.permissions[this.attrs.permission] || [];

-    groupIds = filterByRequiredPermissions(groupIds, this.props.permission);
+    groupIds = filterByRequiredPermissions(groupIds, this.attrs.permission);

    const everyone = groupIds.indexOf(Group.GUEST_ID) !== -1;
    const members = groupIds.indexOf(Group.MEMBER_ID) !== -1;
    const adminGroup = app.store.getById('groups', Group.ADMINISTRATOR_ID);

    if (everyone) {
-      this.props.label = Badge.component({icon: 'fas fa-globe'});
+      this.attrs.label = Badge.component({ icon: 'fas fa-globe' });
    } else if (members) {
-      this.props.label = Badge.component({icon: 'fas fa-user'});
+      this.attrs.label = Badge.component({ icon: 'fas fa-user' });
    } else {
-      this.props.label = [
-        badgeForId(Group.ADMINISTRATOR_ID),
-        groupIds.map(badgeForId)
-      ];
+      this.attrs.label = [badgeForId(Group.ADMINISTRATOR_ID), groupIds.map(badgeForId)];
    }

    if (this.showing) {
-      if (this.props.allowGuest) {
-        this.props.children.push(
-          Button.component({
-            children: [Badge.component({icon: 'fas fa-globe'}), ' ', app.translator.trans('core.admin.permissions_controls.everyone_button')],
-            icon: everyone ? 'fas fa-check' : true,
-            onclick: () => this.save([Group.GUEST_ID]),
-            disabled: this.isGroupDisabled(Group.GUEST_ID)
-          })
+      if (this.attrs.allowGuest) {
+        children.push(
+          Button.component(
+            {
+              icon: everyone ? 'fas fa-check' : true,
+              onclick: () => this.save([Group.GUEST_ID]),
+              disabled: this.isGroupDisabled(Group.GUEST_ID),
+            },
+            [Badge.component({ icon: 'fas fa-globe' }), ' ', app.translator.trans('core.admin.permissions_controls.everyone_button')]
+          )
        );
      }

-      this.props.children.push(
-        Button.component({
-          children: [Badge.component({icon: 'fas fa-user'}), ' ', app.translator.trans('core.admin.permissions_controls.members_button')],
-          icon: members ? 'fas fa-check' : true,
-          onclick: () => this.save([Group.MEMBER_ID]),
-          disabled: this.isGroupDisabled(Group.MEMBER_ID)
-        }),
+      children.push(
+        Button.component(
+          {
+            icon: members ? 'fas fa-check' : true,
+            onclick: () => this.save([Group.MEMBER_ID]),
+            disabled: this.isGroupDisabled(Group.MEMBER_ID),
+          },
+          [Badge.component({ icon: 'fas fa-user' }), ' ', app.translator.trans('core.admin.permissions_controls.members_button')]
+        ),

        Separator.component(),

-        Button.component({
-          children: [badgeForId(adminGroup.id()), ' ', adminGroup.namePlural()],
-          icon: !everyone && !members ? 'fas fa-check' : true,
-          disabled: !everyone && !members,
-          onclick: e => {
-            if (e.shiftKey) e.stopPropagation();
-            this.save([]);
-          }
-        })
+        Button.component(
+          {
+            icon: !everyone && !members ? 'fas fa-check' : true,
+            disabled: !everyone && !members,
+            onclick: (e) => {
+              if (e.shiftKey) e.stopPropagation();
+              this.save([]);
+            },
+          },
+          [badgeForId(adminGroup.id()), ' ', adminGroup.namePlural()]
+        )
      );

      [].push.apply(
-        this.props.children,
-        app.store.all('groups')
-          .filter(group => [Group.ADMINISTRATOR_ID, Group.GUEST_ID, Group.MEMBER_ID].indexOf(group.id()) === -1)
-          .map(group => Button.component({
-            children: [badgeForId(group.id()), ' ', group.namePlural()],
-            icon: groupIds.indexOf(group.id()) !== -1 ? 'fas fa-check' : true,
-            onclick: (e) => {
-              if (e.shiftKey) e.stopPropagation();
-              this.toggle(group.id());
-            },
-            disabled: this.isGroupDisabled(group.id()) && this.isGroupDisabled(Group.MEMBER_ID) && this.isGroupDisabled(Group.GUEST_ID)
-          }))
+        children,
+        app.store
+          .all('groups')
+          .filter((group) => [Group.ADMINISTRATOR_ID, Group.GUEST_ID, Group.MEMBER_ID].indexOf(group.id()) === -1)
+          .map((group) =>
+            Button.component(
+              {
+                icon: groupIds.indexOf(group.id()) !== -1 ? 'fas fa-check' : true,
+                onclick: (e) => {
+                  if (e.shiftKey) e.stopPropagation();
+                  this.toggle(group.id());
+                },
+                disabled: this.isGroupDisabled(group.id()) && this.isGroupDisabled(Group.MEMBER_ID) && this.isGroupDisabled(Group.GUEST_ID),
+              },
+              [badgeForId(group.id()), ' ', group.namePlural()]
+            )
+          )
      );
    }

-    return super.view();
+    return super.view({ ...vnode, children });
  }

  save(groupIds) {
-    const permission = this.props.permission;
+    const permission = this.attrs.permission;

    app.data.permissions[permission] = groupIds;

    app.request({
      method: 'POST',
      url: app.forum.attribute('apiUrl') + '/permission',
-      data: {permission, groupIds}
+      body: { permission, groupIds },
    });
  }

  toggle(groupId) {
-    const permission = this.props.permission;
+    const permission = this.attrs.permission;

    let groupIds = app.data.permissions[permission] || [];

@@ -137,13 +144,13 @@ export default class PermissionDropdown extends Dropdown {
      groupIds.splice(index, 1);
    } else {
      groupIds.push(groupId);
-      groupIds = groupIds.filter(id => [Group.GUEST_ID, Group.MEMBER_ID].indexOf(id) === -1);
+      groupIds = groupIds.filter((id) => [Group.GUEST_ID, Group.MEMBER_ID].indexOf(id) === -1);
    }

    this.save(groupIds);
  }

  isGroupDisabled(id) {
-    return filterByRequiredPermissions([id], this.props.permission).indexOf(id) === -1;
+    return filterByRequiredPermissions([id], this.attrs.permission).indexOf(id) === -1;
  }
 }
--- a/js/src/admin/components/PermissionGrid.js
+++ b/js/src/admin/components/PermissionGrid.js
@@ -6,19 +6,17 @@ import ItemList from '../../common/utils/ItemList';
 import icon from '../../common/helpers/icon';

 export default class PermissionGrid extends Component {
-  init() {
+  oninit(vnode) {
+    super.oninit(vnode);
+
    this.permissions = this.permissionItems().toArray();
  }

  view() {
    const scopes = this.scopeItems().toArray();

-    const permissionCells = permission => {
-      return scopes.map(scope => (
-        <td>
-          {scope.render(permission)}
-        </td>
-      ));
+    const permissionCells = (permission) => {
+      return scopes.map((scope) => <td>{scope.render(permission)}</td>);
    };

    return (
@@ -26,27 +24,32 @@ export default class PermissionGrid extends Component {
        <thead>
          <tr>
            <td></td>
-            {scopes.map(scope => (
+            {scopes.map((scope) => (
              <th>
                {scope.label}{' '}
-                {scope.onremove ? Button.component({icon: 'fas fa-times', className: 'Button Button--text PermissionGrid-removeScope', onclick: scope.onremove}) : ''}
+                {scope.onremove
+                  ? Button.component({ icon: 'fas fa-times', className: 'Button Button--text PermissionGrid-removeScope', onclick: scope.onremove })
+                  : ''}
              </th>
            ))}
            <th>{this.scopeControlItems().toArray()}</th>
          </tr>
        </thead>
-        {this.permissions.map(section => (
+        {this.permissions.map((section) => (
          <tbody>
            <tr className="PermissionGrid-section">
              <th>{section.label}</th>
              {permissionCells(section)}
-              <td/>
+              <td />
            </tr>
-            {section.children.map(child => (
+            {section.children.map((child) => (
              <tr className="PermissionGrid-child">
-                <th>{icon(child.icon)}{child.label}</th>
+                <th>
+                  {icon(child.icon)}
+                  {child.label}
+                </th>
                {permissionCells(child)}
-                <td/>
+                <td />
              </tr>
            ))}
          </tbody>
@@ -58,25 +61,41 @@ export default class PermissionGrid extends Component {
  permissionItems() {
    const items = new ItemList();

-    items.add('view', {
-      label: app.translator.trans('core.admin.permissions.read_heading'),
-      children: this.viewItems().toArray()
-    }, 100);
+    items.add(
+      'view',
+      {
+        label: app.translator.trans('core.admin.permissions.read_heading'),
+        children: this.viewItems().toArray(),
+      },
+      100
+    );

-    items.add('start', {
-      label: app.translator.trans('core.admin.permissions.create_heading'),
-      children: this.startItems().toArray()
-    }, 90);
+    items.add(
+      'start',
+      {
+        label: app.translator.trans('core.admin.permissions.create_heading'),
+        children: this.startItems().toArray(),
+      },
+      90
+    );

-    items.add('reply', {
-      label: app.translator.trans('core.admin.permissions.participate_heading'),
-      children: this.replyItems().toArray()
-    }, 80);
+    items.add(
+      'reply',
+      {
+        label: app.translator.trans('core.admin.permissions.participate_heading'),
+        children: this.replyItems().toArray(),
+      },
+      80
+    );

-    items.add('moderate', {
-      label: app.translator.trans('core.admin.permissions.moderate_heading'),
-      children: this.moderateItems().toArray()
-    }, 70);
+    items.add(
+      'moderate',
+      {
+        label: app.translator.trans('core.admin.permissions.moderate_heading'),
+        children: this.moderateItems().toArray(),
+      },
+      70
+    );

    return items;
  }
@@ -84,31 +103,54 @@ export default class PermissionGrid extends Component {
  viewItems() {
    const items = new ItemList();

-    items.add('viewDiscussions', {
-      icon: 'fas fa-eye',
-      label: app.translator.trans('core.admin.permissions.view_discussions_label'),
-      permission: 'viewDiscussions',
-      allowGuest: true
-    }, 100);
+    items.add(
+      'viewDiscussions',
+      {
+        icon: 'fas fa-eye',
+        label: app.translator.trans('core.admin.permissions.view_discussions_label'),
+        permission: 'viewDiscussions',
+        allowGuest: true,
+      },
+      100
+    );

-    items.add('viewUserList', {
-      icon: 'fas fa-users',
-      label: app.translator.trans('core.admin.permissions.view_user_list_label'),
-      permission: 'viewUserList',
-      allowGuest: true
-    }, 100);
+    items.add(
+      'viewHiddenGroups',
+      {
+        icon: 'fas fa-users',
+        label: app.translator.trans('core.admin.permissions.view_hidden_groups_label'),
+        permission: 'viewHiddenGroups',
+      },
+      100
+    );

-    items.add('signUp', {
-      icon: 'fas fa-user-plus',
-      label: app.translator.trans('core.admin.permissions.sign_up_label'),
-      setting: () => SettingDropdown.component({
-        key: 'allow_sign_up',
-        options: [
-          {value: '1', label: app.translator.trans('core.admin.permissions_controls.signup_open_button')},
-          {value: '0', label: app.translator.trans('core.admin.permissions_controls.signup_closed_button')}
-        ]
-      })
-    }, 90);
+    items.add(
+      'viewUserList',
+      {
+        icon: 'fas fa-users',
+        label: app.translator.trans('core.admin.permissions.view_user_list_label'),
+        permission: 'viewUserList',
+        allowGuest: true,
+      },
+      100
+    );
+
+    items.add(
+      'signUp',
+      {
+        icon: 'fas fa-user-plus',
+        label: app.translator.trans('core.admin.permissions.sign_up_label'),
+        setting: () =>
+          SettingDropdown.component({
+            key: 'allow_sign_up',
+            options: [
+              { value: '1', label: app.translator.trans('core.admin.permissions_controls.signup_open_button') },
+              { value: '0', label: app.translator.trans('core.admin.permissions_controls.signup_closed_button') },
+            ],
+          }),
+      },
+      90
+    );

    items.add('viewLastSeenAt', {
      icon: 'far fa-clock',
@@ -122,31 +164,39 @@ export default class PermissionGrid extends Component {
  startItems() {
    const items = new ItemList();

-    items.add('start', {
-      icon: 'fas fa-edit',
-      label: app.translator.trans('core.admin.permissions.start_discussions_label'),
-      permission: 'startDiscussion'
-    }, 100);
+    items.add(
+      'start',
+      {
+        icon: 'fas fa-edit',
+        label: app.translator.trans('core.admin.permissions.start_discussions_label'),
+        permission: 'startDiscussion',
+      },
+      100
+    );

-    items.add('allowRenaming', {
-      icon: 'fas fa-i-cursor',
-      label: app.translator.trans('core.admin.permissions.allow_renaming_label'),
-      setting: () => {
-        const minutes = parseInt(app.data.settings.allow_renaming, 10);
+    items.add(
+      'allowRenaming',
+      {
+        icon: 'fas fa-i-cursor',
+        label: app.translator.trans('core.admin.permissions.allow_renaming_label'),
+        setting: () => {
+          const minutes = parseInt(app.data.settings.allow_renaming, 10);

-        return SettingDropdown.component({
-          defaultLabel: minutes
-            ? app.translator.transChoice('core.admin.permissions_controls.allow_some_minutes_button', minutes, {count: minutes})
-            : app.translator.trans('core.admin.permissions_controls.allow_indefinitely_button'),
-          key: 'allow_renaming',
-          options: [
-            {value: '-1', label: app.translator.trans('core.admin.permissions_controls.allow_indefinitely_button')},
-            {value: '10', label: app.translator.trans('core.admin.permissions_controls.allow_ten_minutes_button')},
-            {value: 'reply', label: app.translator.trans('core.admin.permissions_controls.allow_until_reply_button')}
-          ]
-        });
-      }
-    }, 90);
+          return SettingDropdown.component({
+            defaultLabel: minutes
+              ? app.translator.transChoice('core.admin.permissions_controls.allow_some_minutes_button', minutes, { count: minutes })
+              : app.translator.trans('core.admin.permissions_controls.allow_indefinitely_button'),
+            key: 'allow_renaming',
+            options: [
+              { value: '-1', label: app.translator.trans('core.admin.permissions_controls.allow_indefinitely_button') },
+              { value: '10', label: app.translator.trans('core.admin.permissions_controls.allow_ten_minutes_button') },
+              { value: 'reply', label: app.translator.trans('core.admin.permissions_controls.allow_until_reply_button') },
+            ],
+          });
+        },
+      },
+      90
+    );

    return items;
  }
@@ -154,31 +204,39 @@ export default class PermissionGrid extends Component {
  replyItems() {
    const items = new ItemList();

-    items.add('reply', {
-      icon: 'fas fa-reply',
-      label: app.translator.trans('core.admin.permissions.reply_to_discussions_label'),
-      permission: 'discussion.reply'
-    }, 100);
+    items.add(
+      'reply',
+      {
+        icon: 'fas fa-reply',
+        label: app.translator.trans('core.admin.permissions.reply_to_discussions_label'),
+        permission: 'discussion.reply',
+      },
+      100
+    );

-    items.add('allowPostEditing', {
-      icon: 'fas fa-pencil-alt',
-      label: app.translator.trans('core.admin.permissions.allow_post_editing_label'),
-      setting: () => {
-        const minutes = parseInt(app.data.settings.allow_post_editing, 10);
+    items.add(
+      'allowPostEditing',
+      {
+        icon: 'fas fa-pencil-alt',
+        label: app.translator.trans('core.admin.permissions.allow_post_editing_label'),
+        setting: () => {
+          const minutes = parseInt(app.data.settings.allow_post_editing, 10);

-        return SettingDropdown.component({
-          defaultLabel: minutes
-            ? app.translator.transChoice('core.admin.permissions_controls.allow_some_minutes_button', minutes, {count: minutes})
-            : app.translator.trans('core.admin.permissions_controls.allow_indefinitely_button'),
-          key: 'allow_post_editing',
-          options: [
-            {value: '-1', label: app.translator.trans('core.admin.permissions_controls.allow_indefinitely_button')},
-            {value: '10', label: app.translator.trans('core.admin.permissions_controls.allow_ten_minutes_button')},
-            {value: 'reply', label: app.translator.trans('core.admin.permissions_controls.allow_until_reply_button')}
-          ]
-        });
-      }
-    }, 90);
+          return SettingDropdown.component({
+            defaultLabel: minutes
+              ? app.translator.transChoice('core.admin.permissions_controls.allow_some_minutes_button', minutes, { count: minutes })
+              : app.translator.trans('core.admin.permissions_controls.allow_indefinitely_button'),
+            key: 'allow_post_editing',
+            options: [
+              { value: '-1', label: app.translator.trans('core.admin.permissions_controls.allow_indefinitely_button') },
+              { value: '10', label: app.translator.trans('core.admin.permissions_controls.allow_ten_minutes_button') },
+              { value: 'reply', label: app.translator.trans('core.admin.permissions_controls.allow_until_reply_button') },
+            ],
+          });
+        },
+      },
+      90
+    );

    return items;
  }
@@ -186,75 +244,121 @@ export default class PermissionGrid extends Component {
  moderateItems() {
    const items = new ItemList();

-    items.add('viewIpsPosts', {
-      icon: 'fas fa-bullseye',
-      label: app.translator.trans('core.admin.permissions.view_post_ips_label'),
-      permission: 'discussion.viewIpsPosts'
-    }, 110);
+    items.add(
+      'viewIpsPosts',
+      {
+        icon: 'fas fa-bullseye',
+        label: app.translator.trans('core.admin.permissions.view_post_ips_label'),
+        permission: 'discussion.viewIpsPosts',
+      },
+      110
+    );

-    items.add('renameDiscussions', {
-      icon: 'fas fa-i-cursor',
-      label: app.translator.trans('core.admin.permissions.rename_discussions_label'),
-      permission: 'discussion.rename'
-    }, 100);
+    items.add(
+      'renameDiscussions',
+      {
+        icon: 'fas fa-i-cursor',
+        label: app.translator.trans('core.admin.permissions.rename_discussions_label'),
+        permission: 'discussion.rename',
+      },
+      100
+    );

-    items.add('hideDiscussions', {
-      icon: 'far fa-trash-alt',
-      label: app.translator.trans('core.admin.permissions.delete_discussions_label'),
-      permission: 'discussion.hide'
-    }, 90);
+    items.add(
+      'hideDiscussions',
+      {
+        icon: 'far fa-trash-alt',
+        label: app.translator.trans('core.admin.permissions.delete_discussions_label'),
+        permission: 'discussion.hide',
+      },
+      90
+    );

-    items.add('deleteDiscussions', {
-      icon: 'fas fa-times',
-      label: app.translator.trans('core.admin.permissions.delete_discussions_forever_label'),
-      permission: 'discussion.delete'
-    }, 80);
+    items.add(
+      'deleteDiscussions',
+      {
+        icon: 'fas fa-times',
+        label: app.translator.trans('core.admin.permissions.delete_discussions_forever_label'),
+        permission: 'discussion.delete',
+      },
+      80
+    );

-    items.add('editPosts', {
-      icon: 'fas fa-pencil-alt',
-      label: app.translator.trans('core.admin.permissions.edit_posts_label'),
-      permission: 'discussion.editPosts'
-    }, 70);
+    items.add(
+      'postWithoutThrottle',
+      {
+        icon: 'fas fa-swimmer',
+        label: app.translator.trans('core.admin.permissions.post_without_throttle_label'),
+        permission: 'postWithoutThrottle',
+      },
+      70
+    );

-    items.add('hidePosts', {
-      icon: 'far fa-trash-alt',
-      label: app.translator.trans('core.admin.permissions.delete_posts_label'),
-      permission: 'discussion.hidePosts'
-    }, 60);
+    items.add(
+      'editPosts',
+      {
+        icon: 'fas fa-pencil-alt',
+        label: app.translator.trans('core.admin.permissions.edit_posts_label'),
+        permission: 'discussion.editPosts',
+      },
+      70
+    );

-    items.add('deletePosts', {
-      icon: 'fas fa-times',
-      label: app.translator.trans('core.admin.permissions.delete_posts_forever_label'),
-      permission: 'discussion.deletePosts'
-    }, 60);
+    items.add(
+      'hidePosts',
+      {
+        icon: 'far fa-trash-alt',
+        label: app.translator.trans('core.admin.permissions.delete_posts_label'),
+        permission: 'discussion.hidePosts',
+      },
+      60
+    );
+
+    items.add(
+      'deletePosts',
+      {
+        icon: 'fas fa-times',
+        label: app.translator.trans('core.admin.permissions.delete_posts_forever_label'),
+        permission: 'discussion.deletePosts',
+      },
+      60
+    );
+
+    items.add(
+      'userEdit',
+      {
+        icon: 'fas fa-user-cog',
+        label: app.translator.trans('core.admin.permissions.edit_users_label'),
+        permission: 'user.edit',
+      },
+      60
+    );

-    items.add('userEdit', {
-      icon: 'fas fa-user-cog',
-      label: app.translator.trans('core.admin.permissions.edit_users_label'),
-      permission: 'user.edit'
-    }, 60);
-    
    return items;
  }

  scopeItems() {
    const items = new ItemList();

-    items.add('global', {
-      label: app.translator.trans('core.admin.permissions.global_heading'),
-      render: item => {
-        if (item.setting) {
-          return item.setting();
-        } else if (item.permission) {
-          return PermissionDropdown.component({
-            permission: item.permission,
-            allowGuest: item.allowGuest
-          });
-        }
+    items.add(
+      'global',
+      {
+        label: app.translator.trans('core.admin.permissions.global_heading'),
+        render: (item) => {
+          if (item.setting) {
+            return item.setting();
+          } else if (item.permission) {
+            return PermissionDropdown.component({
+              permission: item.permission,
+              allowGuest: item.allowGuest,
+            });
+          }

-        return '';
-      }
-    }, 100);
+          return '';
+        },
+      },
+      100
+    );

    return items;
  }
--- a/js/src/admin/components/PermissionsPage.js
+++ b/js/src/admin/components/PermissionsPage.js
@@ -1,4 +1,4 @@
-import Page from './Page';
+import Page from '../../common/components/Page';
 import GroupBadge from '../../common/components/GroupBadge';
 import EditGroupModal from './EditGroupModal';
 import Group from '../../common/models/Group';
@@ -11,29 +11,28 @@ export default class PermissionsPage extends Page {
      <div className="PermissionsPage">
        <div className="PermissionsPage-groups">
          <div className="container">
-            {app.store.all('groups')
-              .filter(group => [Group.GUEST_ID, Group.MEMBER_ID].indexOf(group.id()) === -1)
-              .map(group => (
-                <button className="Button Group" onclick={() => app.modal.show(new EditGroupModal({group}))}>
+            {app.store
+              .all('groups')
+              .filter((group) => [Group.GUEST_ID, Group.MEMBER_ID].indexOf(group.id()) === -1)
+              .map((group) => (
+                <button className="Button Group" onclick={() => app.modal.show(EditGroupModal, { group })}>
                  {GroupBadge.component({
                    group,
                    className: 'Group-icon',
-                    label: null
+                    label: null,
                  })}
                  <span className="Group-name">{group.namePlural()}</span>
                </button>
              ))}
-            <button className="Button Group Group--add" onclick={() => app.modal.show(new EditGroupModal())}>
-              {icon('fas fa-plus', {className: 'Group-icon'})}
+            <button className="Button Group Group--add" onclick={() => app.modal.show(EditGroupModal)}>
+              {icon('fas fa-plus', { className: 'Group-icon' })}
              <span className="Group-name">{app.translator.trans('core.admin.permissions.new_group_button')}</span>
            </button>
          </div>
        </div>

        <div className="PermissionsPage-permissions">
-          <div className="container">
-            {PermissionGrid.component()}
-          </div>
+          <div className="container">{PermissionGrid.component()}</div>
        </div>
      </div>
    );
--- a/js/src/admin/components/SessionDropdown.js
+++ b/js/src/admin/components/SessionDropdown.js
@@ -9,27 +9,22 @@ import ItemList from '../../common/utils/ItemList';
 * avatar/name, with a dropdown of session controls.
 */
 export default class SessionDropdown extends Dropdown {
-  static initProps(props) {
-    super.initProps(props);
+  static initAttrs(attrs) {
+    super.initAttrs(attrs);

-    props.className = 'SessionDropdown';
-    props.buttonClassName = 'Button Button--user Button--flat';
-    props.menuClassName = 'Dropdown-menu--right';
+    attrs.className = 'SessionDropdown';
+    attrs.buttonClassName = 'Button Button--user Button--flat';
+    attrs.menuClassName = 'Dropdown-menu--right';
  }

-  view() {
-    this.props.children = this.items().toArray();
-
-    return super.view();
+  view(vnode) {
+    return super.view({ ...vnode, children: this.items().toArray() });
  }

  getButtonContent() {
    const user = app.session.user;

-    return [
-      avatar(user), ' ',
-      <span className="Button-label">{username(user)}</span>
-    ];
+    return [avatar(user), ' ', <span className="Button-label">{username(user)}</span>];
  }

  /**
@@ -40,12 +35,15 @@ export default class SessionDropdown extends Dropdown {
  items() {
    const items = new ItemList();

-    items.add('logOut',
-      Button.component({
-        icon: 'fas fa-sign-out-alt',
-        children: app.translator.trans('core.admin.header.log_out_button'),
-        onclick: app.session.logout.bind(app.session)
-      }),
+    items.add(
+      'logOut',
+      Button.component(
+        {
+          icon: 'fas fa-sign-out-alt',
+          onclick: app.session.logout.bind(app.session),
+        },
+        app.translator.trans('core.admin.header.log_out_button')
+      ),
      -100
    );

--- a/js/src/admin/components/SettingDropdown.js
+++ b/js/src/admin/components/SettingDropdown.js
@@ -3,23 +3,30 @@ import Button from '../../common/components/Button';
 import saveSettings from '../utils/saveSettings';

 export default class SettingDropdown extends SelectDropdown {
-  static initProps(props) {
-    super.initProps(props);
+  static initAttrs(attrs) {
+    super.initAttrs(attrs);

-    props.className = 'SettingDropdown';
-    props.buttonClassName = 'Button Button--text';
-    props.caretIcon = 'fas fa-caret-down';
-    props.defaultLabel = 'Custom';
+    attrs.className = 'SettingDropdown';
+    attrs.buttonClassName = 'Button Button--text';
+    attrs.caretIcon = 'fas fa-caret-down';
+    attrs.defaultLabel = 'Custom';
+  }

-    props.children = props.options.map(({value, label}) => {
-      const active = app.data.settings[props.key] === value;
+  view(vnode) {
+    return super.view({
+      ...vnode,
+      children: this.attrs.options.map(({ value, label }) => {
+        const active = app.data.settings[this.attrs.key] === value;

-      return Button.component({
-        children: label,
-        icon: active ? 'fas fa-check' : true,
-        onclick: saveSettings.bind(this, {[props.key]: value}),
-        active
-      });
+        return Button.component(
+          {
+            icon: active ? 'fas fa-check' : true,
+            onclick: saveSettings.bind(this, { [this.attrs.key]: value }),
+            active,
+          },
+          label
+        );
+      }),
    });
  }
 }
--- a/js/src/admin/components/SettingsModal.js
+++ b/js/src/admin/components/SettingsModal.js
@@ -1,9 +1,12 @@
 import Modal from '../../common/components/Modal';
 import Button from '../../common/components/Button';
+import Stream from '../../common/utils/Stream';
 import saveSettings from '../utils/saveSettings';

 export default class SettingsModal extends Modal {
-  init() {
+  oninit(vnode) {
+    super.oninit(vnode);
+
    this.settings = {};
    this.loading = false;
  }
@@ -18,9 +21,7 @@ export default class SettingsModal extends Modal {
        <div className="Form">
          {this.form()}

-          <div className="Form-group">
-            {this.submitButton()}
-          </div>
+          <div className="Form-group">{this.submitButton()}</div>
        </div>
      </div>
    );
@@ -28,18 +29,14 @@ export default class SettingsModal extends Modal {

  submitButton() {
    return (
-      <Button
-        type="submit"
-        className="Button Button--primary"
-        loading={this.loading}
-        disabled={!this.changed()}>
+      <Button type="submit" className="Button Button--primary" loading={this.loading} disabled={!this.changed()}>
        {app.translator.trans('core.admin.settings.submit_button')}
      </Button>
    );
  }

  setting(key, fallback = '') {
-    this.settings[key] = this.settings[key] || m.prop(app.data.settings[key] || fallback);
+    this.settings[key] = this.settings[key] || Stream(app.data.settings[key] || fallback);

    return this.settings[key];
  }
@@ -47,7 +44,7 @@ export default class SettingsModal extends Modal {
  dirty() {
    const dirty = {};

-    Object.keys(this.settings).forEach(key => {
+    Object.keys(this.settings).forEach((key) => {
      const value = this.settings[key]();

      if (value !== app.data.settings[key]) {
@@ -67,10 +64,7 @@ export default class SettingsModal extends Modal {

    this.loading = true;

-    saveSettings(this.dirty()).then(
-      this.onsaved.bind(this),
-      this.loaded.bind(this)
-    );
+    saveSettings(this.dirty()).then(this.onsaved.bind(this), this.loaded.bind(this));
  }

  onsaved() {
--- a/js/src/admin/components/StatusWidget.js
+++ b/js/src/admin/components/StatusWidget.js
@@ -20,39 +20,39 @@ export default class StatusWidget extends DashboardWidget {
  }

  content() {
-    return (
-      <ul>{listItems(this.items().toArray())}</ul>
-    );
+    return <ul>{listItems(this.items().toArray())}</ul>;
  }

  items() {
    const items = new ItemList();

-    items.add('tools', (
+    items.add(
+      'tools',
      <Dropdown
        label={app.translator.trans('core.admin.dashboard.tools_button')}
        icon="fas fa-cog"
        buttonClassName="Button"
-        menuClassName="Dropdown-menu--right">
-        <Button onclick={this.handleClearCache.bind(this)}>
-          {app.translator.trans('core.admin.dashboard.clear_cache_button')}
-        </Button>
+        menuClassName="Dropdown-menu--right"
+      >
+        <Button onclick={this.handleClearCache.bind(this)}>{app.translator.trans('core.admin.dashboard.clear_cache_button')}</Button>
      </Dropdown>
-    ));
+    );

-    items.add('version-flarum', [<strong>Flarum</strong>, <br/>, app.forum.attribute('version')]);
-    items.add('version-php', [<strong>PHP</strong>, <br/>, app.data.phpVersion]);
-    items.add('version-mysql', [<strong>MySQL</strong>, <br/>, app.data.mysqlVersion]);
+    items.add('version-flarum', [<strong>Flarum</strong>, <br />, app.forum.attribute('version')]);
+    items.add('version-php', [<strong>PHP</strong>, <br />, app.data.phpVersion]);
+    items.add('version-mysql', [<strong>MySQL</strong>, <br />, app.data.mysqlVersion]);

    return items;
  }

  handleClearCache(e) {
-    app.modal.show(new LoadingModal());
+    app.modal.show(LoadingModal);

-    app.request({
-      method: 'DELETE',
-      url: app.forum.attribute('apiUrl') + '/cache'
-    }).then(() => window.location.reload());
+    app
+      .request({
+        method: 'DELETE',
+        url: app.forum.attribute('apiUrl') + '/cache',
+      })
+      .then(() => window.location.reload());
  }
 }
--- a/js/src/admin/components/UploadImageButton.js
+++ b/js/src/admin/components/UploadImageButton.js
@@ -1,30 +1,28 @@
 import Button from '../../common/components/Button';

 export default class UploadImageButton extends Button {
-  init() {
-    this.loading = false;
-  }
+  loading = false;

-  view() {
-    this.props.loading = this.loading;
-    this.props.className = (this.props.className || '') + ' Button';
+  view(vnode) {
+    this.attrs.loading = this.loading;
+    this.attrs.className = (this.attrs.className || '') + ' Button';

-    if (app.data.settings[this.props.name + '_path']) {
-      this.props.onclick = this.remove.bind(this);
-      this.props.children = app.translator.trans('core.admin.upload_image.remove_button');
+    if (app.data.settings[this.attrs.name + '_path']) {
+      this.attrs.onclick = this.remove.bind(this);

      return (
        <div>
-          <p><img src={app.forum.attribute(this.props.name+'Url')} alt=""/></p>
-          <p>{super.view()}</p>
+          <p>
+            <img src={app.forum.attribute(this.attrs.name + 'Url')} alt="" />
+          </p>
+          <p>{super.view({ ...vnode, children: app.translator.trans('core.admin.upload_image.remove_button') })}</p>
        </div>
      );
    } else {
-      this.props.onclick = this.upload.bind(this);
-      this.props.children = app.translator.trans('core.admin.upload_image.upload_button');
+      this.attrs.onclick = this.upload.bind(this);
    }

-    return super.view();
+    return super.view({ ...vnode, children: app.translator.trans('core.admin.upload_image.upload_button') });
  }

  /**
@@ -35,23 +33,26 @@ export default class UploadImageButton extends Button {

    const $input = $('<input type="file">');

-    $input.appendTo('body').hide().click().on('change', e => {
-      const data = new FormData();
-      data.append(this.props.name, $(e.target)[0].files[0]);
+    $input
+      .appendTo('body')
+      .hide()
+      .click()
+      .on('change', (e) => {
+        const body = new FormData();
+        body.append(this.attrs.name, $(e.target)[0].files[0]);

-      this.loading = true;
-      m.redraw();
+        this.loading = true;
+        m.redraw();

-      app.request({
-        method: 'POST',
-        url: this.resourceUrl(),
-        serialize: raw => raw,
-        data
-      }).then(
-        this.success.bind(this),
-        this.failure.bind(this)
-      );
-    });
+        app
+          .request({
+            method: 'POST',
+            url: this.resourceUrl(),
+            serialize: (raw) => raw,
+            body,
+          })
+          .then(this.success.bind(this), this.failure.bind(this));
+      });
  }

  /**
@@ -61,17 +62,16 @@ export default class UploadImageButton extends Button {
    this.loading = true;
    m.redraw();

-    app.request({
-      method: 'DELETE',
-      url: this.resourceUrl()
-    }).then(
-      this.success.bind(this),
-      this.failure.bind(this)
-    );
+    app
+      .request({
+        method: 'DELETE',
+        url: this.resourceUrl(),
+      })
+      .then(this.success.bind(this), this.failure.bind(this));
  }

  resourceUrl() {
-    return app.forum.attribute('apiUrl') + '/' + this.props.name;
+    return app.forum.attribute('apiUrl') + '/' + this.attrs.name;
  }

  /**
--- a/js/src/admin/components/Widget.js
+++ b/js/src/admin/components/Widget.js
@@ -1,38 +0,0 @@
-/*
- * This file is part of Flarum.
- *
- * (c) Toby Zerner <toby.zerner@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-import Component from '../../common/Component';
-
-export default class DashboardWidget extends Component {
-  view() {
-    return (
-      <div className={"DashboardWidget "+this.className()}>
-        {this.content()}
-      </div>
-    );
-  }
-
-  /**
-   * Get the class name to apply to the widget.
-   *
-   * @return {String}
-   */
-  className() {
-    return '';
-  }
-
-  /**
-   * Get the content of the widget.
-   *
-   * @return {VirtualElement}
-   */
-  content() {
-    return [];
-  }
-}
--- a/js/src/admin/index.js
+++ b/js/src/admin/index.js
@@ -9,7 +9,6 @@ export { app };

 // Export public API

-
 // Export compat API
 import compat from './compat';

--- a/js/src/admin/routes.js
+++ b/js/src/admin/routes.js
@@ -10,13 +10,13 @@ import MailPage from './components/MailPage';
 *
 * @param {App} app
 */
-export default function(app) {
+export default function (app) {
  app.routes = {
-    'dashboard': {path: '/', component: DashboardPage.component()},
-    'basics': {path: '/basics', component: BasicsPage.component()},
-    'permissions': {path: '/permissions', component: PermissionsPage.component()},
-    'appearance': {path: '/appearance', component: AppearancePage.component()},
-    'extensions': {path: '/extensions', component: ExtensionsPage.component()},
-    'mail': {path: '/mail', component: MailPage.component()}
+    dashboard: { path: '/', component: DashboardPage },
+    basics: { path: '/basics', component: BasicsPage },
+    permissions: { path: '/permissions', component: PermissionsPage },
+    appearance: { path: '/appearance', component: AppearancePage },
+    extensions: { path: '/extensions', component: ExtensionsPage },
+    mail: { path: '/mail', component: MailPage },
  };
 }
--- a/js/src/admin/utils/saveSettings.js
+++ b/js/src/admin/utils/saveSettings.js
@@ -3,12 +3,14 @@ export default function saveSettings(settings) {

  Object.assign(app.data.settings, settings);

-  return app.request({
-    method: 'POST',
-    url: app.forum.attribute('apiUrl') + '/settings',
-    data: settings
-  }).catch(error => {
-    app.data.settings = oldSettings;
-    throw error;
-  });
+  return app
+    .request({
+      method: 'POST',
+      url: app.forum.attribute('apiUrl') + '/settings',
+      body: settings,
+    })
+    .catch((error) => {
+      app.data.settings = oldSettings;
+      throw error;
+    });
 }
--- a/js/src/common/Application.js
+++ b/js/src/common/Application.js
@@ -1,5 +1,4 @@
 import ItemList from './utils/ItemList';
-import Alert from './components/Alert';
 import Button from './components/Button';
 import ModalManager from './components/ModalManager';
 import AlertManager from './components/AlertManager';
@@ -12,6 +11,7 @@ import Drawer from './utils/Drawer';
 import mapRoutes from './utils/mapRoutes';
 import RequestError from './utils/RequestError';
 import ScrollListener from './utils/ScrollListener';
+import liveHumanTimes from './utils/liveHumanTimes';
 import { extend } from './extend';

 import Forum from './models/Forum';
@@ -21,6 +21,9 @@ import Post from './models/Post';
 import Group from './models/Group';
 import Notification from './models/Notification';
 import { flattenDeep } from 'lodash-es';
+import PageState from './states/PageState';
+import ModalManagerState from './states/ModalManagerState';
+import AlertManagerState from './states/AlertManagerState';

 /**
 * The `App` class provides a container for an application, as well as various
@@ -86,7 +89,7 @@ export default class Application {
    discussions: Discussion,
    posts: Post,
    groups: Group,
-    notifications: Notification
+    notifications: Notification,
  });

  /**
@@ -107,13 +110,49 @@ export default class Application {
  booted = false;

  /**
-   * An Alert that was shown as a result of an AJAX request error. If present,
-   * it will be dismissed on the next successful request.
+   * The key for an Alert that was shown as a result of an AJAX request error.
+   * If present, it will be dismissed on the next successful request.
   *
-   * @type {null|Alert}
+   * @type {int}
   * @private
   */
-  requestError = null;
+  requestErrorAlert = null;
+
+  /**
+   * The page the app is currently on.
+   *
+   * This object holds information about the type of page we are currently
+   * visiting, and sometimes additional arbitrary page state that may be
+   * relevant to lower-level components.
+   *
+   * @type {PageState}
+   */
+  current = new PageState(null);
+
+  /**
+   * The page the app was on before the current page.
+   *
+   * Once the application navigates to another page, the object previously
+   * assigned to this.current will be moved to this.previous, while this.current
+   * is re-initialized.
+   *
+   * @type {PageState}
+   */
+  previous = new PageState(null);
+
+  /*
+   * An object that manages modal state.
+   *
+   * @type {ModalManagerState}
+   */
+  modal = new ModalManagerState();
+
+  /**
+   * An object that manages the state of active alerts.
+   *
+   * @type {AlertManagerState}
+   */
+  alerts = new AlertManagerState();

  data;

@@ -126,22 +165,19 @@ export default class Application {
  }

  boot() {
-    this.initializers.toArray().forEach(initializer => initializer(this));
+    this.initializers.toArray().forEach((initializer) => initializer(this));

-    this.store.pushPayload({data: this.data.resources});
+    this.store.pushPayload({ data: this.data.resources });

    this.forum = this.store.getById('forums', 1);

-    this.session = new Session(
-        this.store.getById('users', this.data.session.userId),
-        this.data.session.csrfToken
-    );
+    this.session = new Session(this.store.getById('users', this.data.session.userId), this.data.session.csrfToken);

    this.mount();
  }

  bootExtensions(extensions) {
-    Object.keys(extensions).forEach(name => {
+    Object.keys(extensions).forEach((name) => {
      const extension = extensions[name];

      const extenders = flattenDeep(extension.extend);
@@ -153,31 +189,28 @@ export default class Application {
  }

  mount(basePath = '') {
-    this.modal = m.mount(document.getElementById('modal'), <ModalManager/>);
-    this.alerts = m.mount(document.getElementById('alerts'), <AlertManager/>);
+    // An object with a callable view property is used in order to pass arguments to the component; see https://mithril.js.org/mount.html
+    m.mount(document.getElementById('modal'), { view: () => ModalManager.component({ state: this.modal }) });
+    m.mount(document.getElementById('alerts'), { view: () => AlertManager.component({ state: this.alerts }) });

    this.drawer = new Drawer();

-    m.route(
-      document.getElementById('content'),
-      basePath + '/',
-      mapRoutes(this.routes, basePath)
-    );
+    m.route(document.getElementById('content'), basePath + '/', mapRoutes(this.routes, basePath));

    // Add a class to the body which indicates that the page has been scrolled
    // down.
-    new ScrollListener(top => {
+    new ScrollListener((top) => {
      const $app = $('#app');
      const offset = $app.offset().top;

-      $app
-        .toggleClass('affix', top >= offset)
-        .toggleClass('scrolled', top > offset);
+      $app.toggleClass('affix', top >= offset).toggleClass('scrolled', top > offset);
    }).start();

    $(() => {
      $('body').addClass('ontouchstart' in window ? 'touch' : 'no-touch');
    });
+
+    liveHumanTimes();
  }

  /**
@@ -198,6 +231,16 @@ export default class Application {
    return null;
  }

+  /**
+   * Determine the current screen mode, based on our media queries.
+   *
+   * @returns {String} - one of "phone", "tablet", "desktop" or "desktop-hd"
+   */
+  screen() {
+    const styles = getComputedStyle(document.documentElement);
+    return styles.getPropertyValue('--flarum-screen');
+  }
+
  /**
   * Set the <title> of the page.
   *
@@ -220,9 +263,10 @@ export default class Application {
  }

  updateTitle() {
-    document.title = (this.titleCount ? `(${this.titleCount}) ` : '') +
-      (this.title ? this.title + ' - ' : '') +
-      this.forum.attribute('title');
+    const count = this.titleCount ? `(${this.titleCount}) ` : '';
+    const pageTitleWithSeparator = this.title && m.route.get() !== '/' ? this.title + ' - ' : '';
+    const title = this.forum.attribute('title');
+    document.title = count + pageTitleWithSeparator + title;
  }

  /**
@@ -256,17 +300,19 @@ export default class Application {
    // When we deserialize JSON data, if for some reason the server has provided
    // a dud response, we don't want the application to crash. We'll show an
    // error message to the user instead.
-    options.deserialize = options.deserialize || (responseText => responseText);
+    options.deserialize = options.deserialize || ((responseText) => responseText);

-    options.errorHandler = options.errorHandler || (error => {
-      throw error;
-    });
+    options.errorHandler =
+      options.errorHandler ||
+      ((error) => {
+        throw error;
+      });

    // When extracting the data from the response, we can check the server
    // response code and show an error message to the user if something's gone
    // awry.
    const original = options.extract;
-    options.extract = xhr => {
+    options.extract = (xhr) => {
      let responseText;

      if (original) {
@@ -293,73 +339,88 @@ export default class Application {
      }
    };

-    if (this.requestError) this.alerts.dismiss(this.requestError.alert);
+    if (this.requestErrorAlert) this.alerts.dismiss(this.requestErrorAlert);

    // Now make the request. If it's a failure, inspect the error that was
    // returned and show an alert containing its contents.
-    const deferred = m.deferred();
+    return m.request(options).then(
+      (response) => response,
+      (error) => {
+        let content;

-    m.request(options).then(response => deferred.resolve(response), error => {
-      this.requestError = error;
+        switch (error.status) {
+          case 422:
+            content = error.response.errors
+              .map((error) => [error.detail, <br />])
+              .reduce((a, b) => a.concat(b), [])
+              .slice(0, -1);
+            break;

-      let children;
+          case 401:
+          case 403:
+            content = app.translator.trans('core.lib.error.permission_denied_message');
+            break;

-      switch (error.status) {
-        case 422:
-          children = error.response.errors
-            .map(error => [error.detail, <br/>])
-            .reduce((a, b) => a.concat(b), [])
-            .slice(0, -1);
-          break;
+          case 404:
+          case 410:
+            content = app.translator.trans('core.lib.error.not_found_message');
+            break;

-        case 401:
-        case 403:
-          children = app.translator.trans('core.lib.error.permission_denied_message');
-          break;
+          case 429:
+            content = app.translator.trans('core.lib.error.rate_limit_exceeded_message');
+            break;

-        case 404:
-        case 410:
-          children = app.translator.trans('core.lib.error.not_found_message');
-          break;
+          default:
+            content = app.translator.trans('core.lib.error.generic_message');
+        }

-        case 429:
-          children = app.translator.trans('core.lib.error.rate_limit_exceeded_message');
-          break;
+        const isDebug = app.forum.attribute('debug');
+        // contains a formatted errors if possible, response must be an JSON API array of errors
+        // the details property is decoded to transform escaped characters such as '\n'
+        const errors = error.response && error.response.errors;
+        const formattedError = Array.isArray(errors) && errors[0] && errors[0].detail && errors.map((e) => decodeURI(e.detail));

-        default:
-          children = app.translator.trans('core.lib.error.generic_message');
+        error.alert = {
+          type: 'error',
+          content,
+          controls: isDebug && [
+            <Button className="Button Button--link" onclick={this.showDebug.bind(this, error, formattedError)}>
+              Debug
+            </Button>,
+          ],
+        };
+
+        try {
+          options.errorHandler(error);
+        } catch (error) {
+          if (isDebug && error.xhr) {
+            const { method, url } = error.options;
+            const { status = '' } = error.xhr;
+
+            console.group(`${method} ${url} ${status}`);
+
+            console.error(...(formattedError || [error]));
+
+            console.groupEnd();
+          }
+
+          this.requestErrorAlert = this.alerts.show(error.alert, error.alert.content);
+        }
+
+        return Promise.reject(error);
      }
-
-      const isDebug = app.forum.attribute('debug');
-
-      error.alert = new Alert({
-        type: 'error',
-        children,
-        controls: isDebug && [
-          <Button className="Button Button--link" onclick={this.showDebug.bind(this, error)}>Debug</Button>
-        ]
-      });
-
-      try {
-        options.errorHandler(error);
-      } catch (error) {
-        this.alerts.show(error.alert);
-      }
-
-      deferred.reject(error);
-    });
-
-    return deferred.promise;
+    );
  }

  /**
   * @param {RequestError} error
+   * @param {string[]} [formattedError]
   * @private
   */
-  showDebug(error) {
-    this.alerts.dismiss(this.requestError.alert);
+  showDebug(error, formattedError) {
+    this.alerts.dismiss(this.requestErrorAlert);

-    this.modal.show(new RequestErrorModal({error}));
+    this.modal.show(RequestErrorModal, { error, formattedError });
  }

  /**
@@ -371,9 +432,19 @@ export default class Application {
   * @public
   */
  route(name, params = {}) {
-    const url = this.routes[name].path.replace(/:([^\/]+)/g, (m, key) => extract(params, key));
-    const queryString = m.route.buildQueryString(params);
-    const prefix = m.route.mode === 'pathname' ? app.forum.attribute('basePath') : '';
+    const route = this.routes[name];
+
+    if (!route) throw new Error(`Route '${name}' does not exist`);
+
+    const url = route.path.replace(/:([^\/]+)/g, (m, key) => extract(params, key));
+
+    // Remove falsy values in params to avoid having urls like '/?sort&q'
+    for (const key in params) {
+      if (params.hasOwnProperty(key) && !params[key]) delete params[key];
+    }
+
+    const queryString = m.buildQueryString(params);
+    const prefix = m.route.prefix === '' ? this.forum.attribute('basePath') : '';

    return prefix + url + (queryString ? '?' + queryString : '');
  }
--- a/js/src/common/Component.js
+++ b/js/src/common/Component.js
@@ -1,225 +0,0 @@
-/*
- * This file is part of Flarum.
- *
- * (c) Toby Zerner <toby.zerner@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-/**
- * The `Component` class defines a user interface 'building block'. A component
- * can generate a virtual DOM to be rendered on each redraw.
- *
- * An instance's virtual DOM can be retrieved directly using the {@link
- * Component#render} method.
- *
- * @example
- * this.myComponentInstance = new MyComponent({foo: 'bar'});
- * return m('div', this.myComponentInstance.render());
- *
- * Alternatively, components can be nested, letting Mithril take care of
- * instance persistence. For this, the static {@link Component.component} method
- * can be used.
- *
- * @example
- * return m('div', MyComponent.component({foo: 'bar'));
- *
- * @see https://lhorie.github.io/mithril/mithril.component.html
- * @abstract
- */
-export default class Component {
-  /**
-   * @param {Object} props
-   * @param {Array|Object} children
-   * @public
-   */
-  constructor(props = {}, children = null) {
-    if (children) props.children = children;
-
-    this.constructor.initProps(props);
-
-    /**
-     * The properties passed into the component.
-     *
-     * @type {Object}
-     */
-    this.props = props;
-
-    /**
-     * The root DOM element for the component.
-     *
-     * @type DOMElement
-     * @public
-     */
-    this.element = null;
-
-    /**
-     * Whether or not to retain the component's subtree on redraw.
-     *
-     * @type {boolean}
-     * @public
-     */
-    this.retain = false;
-
-    this.init();
-  }
-
-  /**
-   * Called when the component is constructed.
-   *
-   * @protected
-   */
-  init() {
-  }
-
-  /**
-   * Called when the component is destroyed, i.e. after a redraw where it is no
-   * longer a part of the view.
-   *
-   * @see https://lhorie.github.io/mithril/mithril.component.html#unloading-components
-   * @param {Object} e
-   * @public
-   */
-  onunload() {
-  }
-
-  /**
-   * Get the renderable virtual DOM that represents the component's view.
-   *
-   * This should NOT be overridden by subclasses. Subclasses wishing to define
-   * their virtual DOM should override Component#view instead.
-   *
-   * @example
-   * this.myComponentInstance = new MyComponent({foo: 'bar'});
-   * return m('div', this.myComponentInstance.render());
-   *
-   * @returns {Object}
-   * @final
-   * @public
-   */
-  render() {
-    const vdom = this.retain ? {subtree: 'retain'} : this.view();
-
-    // Override the root element's config attribute with our own function, which
-    // will set the component instance's element property to the root DOM
-    // element, and then run the component class' config method.
-    vdom.attrs = vdom.attrs || {};
-
-    const originalConfig = vdom.attrs.config;
-
-    vdom.attrs.config = (...args) => {
-      this.element = args[0];
-      this.config.apply(this, args.slice(1));
-      if (originalConfig) originalConfig.apply(this, args);
-    };
-
-    return vdom;
-  }
-
-  /**
-   * Returns a jQuery object for this component's element. If you pass in a
-   * selector string, this method will return a jQuery object, using the current
-   * element as its buffer.
-   *
-   * For example, calling `component.$('li')` will return a jQuery object
-   * containing all of the `li` elements inside the DOM element of this
-   * component.
-   *
-   * @param {String} [selector] a jQuery-compatible selector string
-   * @returns {jQuery} the jQuery object for the DOM node
-   * @final
-   * @public
-   */
-  $(selector) {
-    const $element = $(this.element);
-
-    return selector ? $element.find(selector) : $element;
-  }
-
-  /**
-   * Called after the component's root element is redrawn. This hook can be used
-   * to perform any actions on the DOM, both on the initial draw and any
-   * subsequent redraws. See Mithril's documentation for more information.
-   *
-   * @see https://lhorie.github.io/mithril/mithril.html#the-config-attribute
-   * @param {Boolean} isInitialized
-   * @param {Object} context
-   * @param {Object} vdom
-   * @public
-   */
-  config() {
-  }
-
-  /**
-   * Get the virtual DOM that represents the component's view.
-   *
-   * @return {Object} The virtual DOM
-   * @protected
-   */
-  view() {
-    throw new Error('Component#view must be implemented by subclass');
-  }
-
-  /**
-   * Get a Mithril component object for this component, preloaded with props.
-   *
-   * @see https://lhorie.github.io/mithril/mithril.component.html
-   * @param {Object} [props] Properties to set on the component
-   * @param children
-   * @return {Object} The Mithril component object
-   * @property {function} controller
-   * @property {function} view
-   * @property {Object} component The class of this component
-   * @property {Object} props The props that were passed to the component
-   * @public
-   */
-  static component(props = {}, children = null) {
-    const componentProps = Object.assign({}, props);
-
-    if (children) componentProps.children = children;
-
-    this.initProps(componentProps);
-
-    // Set up a function for Mithril to get the component's view. It will accept
-    // the component's controller (which happens to be the component itself, in
-    // our case), update its props with the ones supplied, and then render the view.
-    const view = (component) => {
-      component.props = componentProps;
-      return component.render();
-    };
-
-    // Mithril uses this property on the view function to cache component
-    // controllers between redraws, thus persisting component state.
-    view.$original = this.prototype.view;
-
-    // Our output object consists of a controller constructor + a view function
-    // which Mithril will use to instantiate and render the component. We also
-    // attach a reference to the props that were passed through and the
-    // component's class for reference.
-    const output = {
-      controller: this.bind(undefined, componentProps),
-      view: view,
-      props: componentProps,
-      component: this
-    };
-
-    // If a `key` prop was set, then we'll assume that we want that to actually
-    // show up as an attribute on the component object so that Mithril's key
-    // algorithm can be applied.
-    if (componentProps.key) {
-      output.attrs = {key: componentProps.key};
-    }
-
-    return output;
-  }
-
-  /**
-   * Initialize the component's props.
-   *
-   * @param {Object} props
-   * @public
-   */
-  static initProps(props) {
-  }
-}
--- a/js/src/common/Component.ts
+++ b/js/src/common/Component.ts
@@ -0,0 +1,168 @@
+import * as Mithril from 'mithril';
+
+let deprecatedPropsWarned = false;
+let deprecatedInitPropsWarned = false;
+
+export interface ComponentAttrs extends Mithril.Attributes {}
+
+/**
+ * The `Component` class defines a user interface 'building block'. A component
+ * generates a virtual DOM to be rendered on each redraw.
+ *
+ * Essentially, this is a wrapper for Mithril's components that adds several useful features:
+ *
+ *  - In the `oninit` and `onbeforeupdate` lifecycle hooks, we store vnode attrs in `this.attrs.
+ *    This allows us to use attrs across components without having to pass the vnode to every single
+ *    method.
+ *  - The static `initAttrs` method allows a convenient way to provide defaults (or to otherwise modify)
+ *    the attrs that have been passed into a component.
+ *  - When the component is created in the DOM, we store its DOM element under `this.element`; this lets
+ *    us use jQuery to modify child DOM state from internal methods via the `this.$()` method.
+ *  - A convenience `component` method, which serves as an alternative to hyperscript and JSX.
+ *
+ * As with other Mithril components, components extending Component can be initialized
+ * and nested using JSX, hyperscript, or a combination of both. The `component` method can also
+ * be used.
+ *
+ * @example
+ * return m('div', <MyComponent foo="bar"><p>Hello World</p></MyComponent>);
+ *
+ * @example
+ * return m('div', MyComponent.component({foo: 'bar'), m('p', 'Hello World!'));
+ *
+ * @see https://mithril.js.org/components.html
+ */
+export default abstract class Component<T extends ComponentAttrs = ComponentAttrs> implements Mithril.ClassComponent<T> {
+  /**
+   * The root DOM element for the component.
+   */
+  protected element!: Element;
+
+  /**
+   * The attributes passed into the component.
+   *
+   * @see https://mithril.js.org/components.html#passing-data-to-components
+   */
+  protected attrs!: T;
+
+  /**
+   * @inheritdoc
+   */
+  abstract view(vnode: Mithril.Vnode<T, this>): Mithril.Children;
+
+  /**
+   * @inheritdoc
+   */
+  oninit(vnode: Mithril.Vnode<T, this>) {
+    this.setAttrs(vnode.attrs);
+  }
+
+  /**
+   * @inheritdoc
+   */
+  oncreate(vnode: Mithril.VnodeDOM<T, this>) {
+    this.element = vnode.dom;
+  }
+
+  /**
+   * @inheritdoc
+   */
+  onbeforeupdate(vnode: Mithril.VnodeDOM<T, this>) {
+    this.setAttrs(vnode.attrs);
+  }
+
+  /**
+   * Returns a jQuery object for this component's element. If you pass in a
+   * selector string, this method will return a jQuery object, using the current
+   * element as its buffer.
+   *
+   * For example, calling `component.$('li')` will return a jQuery object
+   * containing all of the `li` elements inside the DOM element of this
+   * component.
+   *
+   * @param {String} [selector] a jQuery-compatible selector string
+   * @returns {jQuery} the jQuery object for the DOM node
+   * @final
+   */
+  protected $(selector) {
+    const $element = $(this.element);
+
+    return selector ? $element.find(selector) : $element;
+  }
+
+  /**
+   * Convenience method to attach a component without JSX.
+   * Has the same effect as calling `m(THIS_CLASS, attrs, children)`.
+   *
+   * @see https://mithril.js.org/hyperscript.html#mselector,-attributes,-children
+   */
+  static component(attrs = {}, children = null): Mithril.Vnode {
+    const componentAttrs = Object.assign({}, attrs);
+
+    return m(this as any, componentAttrs, children);
+  }
+
+  /**
+   * Saves a reference to the vnode attrs after running them through initAttrs,
+   * and checking for common issues.
+   */
+  private setAttrs(attrs: T = {} as T): void {
+    (this.constructor as typeof Component).initAttrs(attrs);
+
+    if (attrs) {
+      if ('children' in attrs) {
+        throw new Error(
+          `[${
+            (this.constructor as any).name
+          }] The "children" attribute of attrs should never be used. Either pass children in as the vnode children or rename the attribute`
+        );
+      }
+
+      if ('tag' in attrs) {
+        throw new Error(`[${(this.constructor as any).name}] You cannot use the "tag" attribute name with Mithril 2.`);
+      }
+    }
+
+    this.attrs = attrs;
+  }
+
+  /**
+   * Initialize the component's attrs.
+   *
+   * This can be used to assign default values for missing, optional attrs.
+   */
+  protected static initAttrs<T>(attrs: T): void {
+    // Deprecated, part of Mithril 2 BC layer
+    if ('initProps' in this && !deprecatedInitPropsWarned) {
+      deprecatedInitPropsWarned = true;
+      console.warn('initProps is deprecated, please use initAttrs instead.');
+      (this as any).initProps(attrs);
+    }
+  }
+
+  // BEGIN DEPRECATED MITHRIL 2 BC LAYER
+
+  /**
+   * The attributes passed into the component.
+   *
+   * @see https://mithril.js.org/components.html#passing-data-to-components
+   *
+   * @deprecated, use attrs instead.
+   */
+  get props() {
+    if (!deprecatedPropsWarned) {
+      deprecatedPropsWarned = true;
+      console.warn('this.props is deprecated, please use this.attrs instead.');
+    }
+    return this.attrs;
+  }
+  set props(props) {
+    if (!deprecatedPropsWarned) {
+      deprecatedPropsWarned = true;
+      console.warn('this.props is deprecated, please use this.attrs instead.');
+    }
+    this.attrs = props;
+  }
+
+  // END DEPRECATED MITHRIL 2 BC LAYER
+}
--- a/js/src/common/Fragment.ts
+++ b/js/src/common/Fragment.ts
@@ -0,0 +1,74 @@
+import * as Mithril from 'mithril';
+
+/**
+ * The `Fragment` class represents a chunk of DOM that is rendered once with Mithril and then takes
+ * over control of its own DOM and lifecycle.
+ *
+ * This is very similar to the `Component` wrapper class, but is used for more fine-grained control over
+ * the rendering and display of some significant chunks of the DOM. In contrast to components, fragments
+ * do not offer Mithril's lifecycle hooks.
+ *
+ * Use this when you want to enjoy the benefits of JSX / VDOM for initial rendering, combined with
+ * small helper methods that then make updates to that DOM directly, instead of fully redrawing
+ * everything through Mithril.
+ *
+ * This should only be used when necessary, and only with `m.render`. If you are unsure whether you need
+ * this or `Component, you probably need `Component`.
+ */
+export default abstract class Fragment {
+  /**
+   * The root DOM element for the fragment.
+   */
+  protected element!: Element;
+
+  /**
+   * Returns a jQuery object for this fragment's element. If you pass in a
+   * selector string, this method will return a jQuery object, using the current
+   * element as its buffer.
+   *
+   * For example, calling `fragment.$('li')` will return a jQuery object
+   * containing all of the `li` elements inside the DOM element of this
+   * fragment.
+   *
+   * @param {String} [selector] a jQuery-compatible selector string
+   * @returns {jQuery} the jQuery object for the DOM node
+   * @final
+   */
+  public $(selector) {
+    const $element = $(this.element);
+
+    return selector ? $element.find(selector) : $element;
+  }
+
+  /**
+   * Get the renderable virtual DOM that represents the fragment's view.
+   *
+   * This should NOT be overridden by subclasses. Subclasses wishing to define
+   * their virtual DOM should override Fragment#view instead.
+   *
+   * @example
+   * const fragment = new MyFragment();
+   * m.render(document.body, fragment.render());
+   *
+   * @final
+   */
+  public render(): Mithril.Vnode<Mithril.Attributes, this> {
+    const vdom = this.view();
+
+    vdom.attrs = vdom.attrs || {};
+
+    const originalOnCreate = vdom.attrs.oncreate;
+
+    vdom.attrs.oncreate = (vnode) => {
+      this.element = vnode.dom;
+      if (originalOnCreate) originalOnCreate.apply(this, [vnode]);
+    };
+
+    return vdom;
+  }
+
+  /**
+   * Creates a view out of virtual elements.
+   */
+  abstract view(): Mithril.Vnode<Mithril.Attributes, this>;
+}
--- a/js/src/common/Model.js
+++ b/js/src/common/Model.js
@@ -88,7 +88,7 @@ export default class Model {
        // relationship data object.
        for (const innerKey in data[key]) {
          if (data[key][innerKey] instanceof Model) {
-            data[key][innerKey] = {data: Model.getIdentifier(data[key][innerKey])};
+            data[key][innerKey] = { data: Model.getIdentifier(data[key][innerKey]) };
          }
          this.data[key][innerKey] = data[key][innerKey];
        }
@@ -109,7 +109,7 @@ export default class Model {
   * @public
   */
  pushAttributes(attributes) {
-    this.pushData({attributes});
+    this.pushData({ attributes });
  }

  /**
@@ -125,7 +125,7 @@ export default class Model {
    const data = {
      type: this.data.type,
      id: this.data.id,
-      attributes
+      attributes,
    };

    // If a 'relationships' key exists, extract it from the attributes hash and
@@ -138,9 +138,7 @@ export default class Model {
        const model = attributes.relationships[key];

        data.relationships[key] = {
-          data: model instanceof Array
-            ? model.map(Model.getIdentifier)
-            : Model.getIdentifier(model)
+          data: model instanceof Array ? model.map(Model.getIdentifier) : Model.getIdentifier(model),
        };
      }

@@ -154,52 +152,66 @@ export default class Model {

    this.pushData(data);

-    const request = {data};
+    const request = { data };
    if (options.meta) request.meta = options.meta;

-    return app.request(Object.assign({
-      method: this.exists ? 'PATCH' : 'POST',
-      url: app.forum.attribute('apiUrl') + this.apiEndpoint(),
-      data: request
-    }, options)).then(
-      // If everything went well, we'll make sure the store knows that this
-      // model exists now (if it didn't already), and we'll push the data that
-      // the API returned into the store.
-      payload => {
-        this.store.data[payload.data.type] = this.store.data[payload.data.type] || {};
-        this.store.data[payload.data.type][payload.data.id] = this;
-        return this.store.pushPayload(payload);
-      },
+    return app
+      .request(
+        Object.assign(
+          {
+            method: this.exists ? 'PATCH' : 'POST',
+            url: app.forum.attribute('apiUrl') + this.apiEndpoint(),
+            body: request,
+          },
+          options
+        )
+      )
+      .then(
+        // If everything went well, we'll make sure the store knows that this
+        // model exists now (if it didn't already), and we'll push the data that
+        // the API returned into the store.
+        (payload) => {
+          this.store.data[payload.data.type] = this.store.data[payload.data.type] || {};
+          this.store.data[payload.data.type][payload.data.id] = this;
+          return this.store.pushPayload(payload);
+        },

-      // If something went wrong, though... good thing we backed up our model's
-      // old data! We'll revert to that and let others handle the error.
-      response => {
-        this.pushData(oldData);
-        m.lazyRedraw();
-        throw response;
-      }
-    );
+        // If something went wrong, though... good thing we backed up our model's
+        // old data! We'll revert to that and let others handle the error.
+        (response) => {
+          this.pushData(oldData);
+          m.redraw();
+          throw response;
+        }
+      );
  }

  /**
   * Send a request to delete the resource.
   *
-   * @param {Object} data Data to send along with the DELETE request.
+   * @param {Object} body Data to send along with the DELETE request.
   * @param {Object} [options]
   * @return {Promise}
   * @public
   */
-  delete(data, options = {}) {
-    if (!this.exists) return m.deferred().resolve().promise;
+  delete(body, options = {}) {
+    if (!this.exists) return Promise.resolve();

-    return app.request(Object.assign({
-      method: 'DELETE',
-      url: app.forum.attribute('apiUrl') + this.apiEndpoint(),
-      data
-    }, options)).then(() => {
-      this.exists = false;
-      this.store.remove(this);
-    });
+    return app
+      .request(
+        Object.assign(
+          {
+            method: 'DELETE',
+            url: app.forum.attribute('apiUrl') + this.apiEndpoint(),
+            body,
+          },
+          options
+        )
+      )
+      .then(() => {
+        this.exists = false;
+        this.store.remove(this);
+      });
  }

  /**
@@ -225,7 +237,7 @@ export default class Model {
   * @public
   */
  static attribute(name, transform) {
-    return function() {
+    return function () {
      const value = this.data.attributes && this.data.attributes[name];

      return transform ? transform(value) : value;
@@ -243,7 +255,7 @@ export default class Model {
   * @public
   */
  static hasOne(name) {
-    return function() {
+    return function () {
      if (this.data.relationships) {
        const relationship = this.data.relationships[name];

@@ -267,12 +279,12 @@ export default class Model {
   * @public
   */
  static hasMany(name) {
-    return function() {
+    return function () {
      if (this.data.relationships) {
        const relationship = this.data.relationships[name];

        if (relationship) {
-          return relationship.data.map(data => app.store.getById(data.type, data.id));
+          return relationship.data.map((data) => app.store.getById(data.type, data.id));
        }
      }

@@ -301,7 +313,7 @@ export default class Model {
  static getIdentifier(model) {
    return {
      type: model.data.type,
-      id: model.data.id
+      id: model.data.id,
    };
  }
 }
--- a/js/src/common/Session.js
+++ b/js/src/common/Session.js
@@ -30,12 +30,17 @@ export default class Session {
   * @return {Promise}
   * @public
   */
-  login(data, options = {}) {
-    return app.request(Object.assign({
-      method: 'POST',
-      url: app.forum.attribute('baseUrl') + '/login',
-      data
-    }, options));
+  login(body, options = {}) {
+    return app.request(
+      Object.assign(
+        {
+          method: 'POST',
+          url: `${app.forum.attribute('baseUrl')}/login`,
+          body,
+        },
+        options
+      )
+    );
  }

  /**
@@ -44,6 +49,6 @@ export default class Session {
   * @public
   */
  logout() {
-    window.location = app.forum.attribute('baseUrl') + '/logout?token=' + this.csrfToken;
+    window.location = `${app.forum.attribute('baseUrl')}/logout?token=${this.csrfToken}`;
  }
 }
--- a/js/src/common/Store.js
+++ b/js/src/common/Store.js
@@ -34,9 +34,7 @@ export default class Store {
  pushPayload(payload) {
    if (payload.included) payload.included.map(this.pushObject.bind(this));

-    const result = payload.data instanceof Array
-      ? payload.data.map(this.pushObject.bind(this))
-      : this.pushObject(payload.data);
+    const result = payload.data instanceof Array ? payload.data.map(this.pushObject.bind(this)) : this.pushObject(payload.data);

    // Attach the original payload to the model that we give back. This is
    // useful to consumers as it allows them to access meta information
@@ -58,7 +56,7 @@ export default class Store {
  pushObject(data) {
    if (!this.models[data.type]) return null;

-    const type = this.data[data.type] = this.data[data.type] || {};
+    const type = (this.data[data.type] = this.data[data.type] || {});

    if (type[data.id]) {
      type[data.id].pushData(data);
@@ -84,22 +82,29 @@ export default class Store {
   * @public
   */
  find(type, id, query = {}, options = {}) {
-    let data = query;
+    let params = query;
    let url = app.forum.attribute('apiUrl') + '/' + type;

    if (id instanceof Array) {
      url += '?filter[id]=' + id.join(',');
    } else if (typeof id === 'object') {
-      data = id;
+      params = id;
    } else if (id) {
      url += '/' + id;
    }

-    return app.request(Object.assign({
-      method: 'GET',
-      url,
-      data
-    }, options)).then(this.pushPayload.bind(this));
+    return app
+      .request(
+        Object.assign(
+          {
+            method: 'GET',
+            url,
+            params,
+          },
+          options
+        )
+      )
+      .then(this.pushPayload.bind(this));
  }

  /**
@@ -124,7 +129,7 @@ export default class Store {
   * @public
   */
  getBy(type, key, value) {
-    return this.all(type).filter(model => model[key]() === value)[0];
+    return this.all(type).filter((model) => model[key]() === value)[0];
  }

  /**
@@ -137,7 +142,7 @@ export default class Store {
  all(type) {
    const records = this.data[type];

-    return records ? Object.keys(records).map(id => records[id]) : [];
+    return records ? Object.keys(records).map((id) => records[id]) : [];
  }

  /**
@@ -160,6 +165,6 @@ export default class Store {
  createRecord(type, data = {}) {
    data.type = data.type || type;

-    return new (this.models[type])(data, this);
+    return new this.models[type](data, this);
  }
 }
--- a/js/src/common/Translator.js
+++ b/js/src/common/Translator.js
@@ -1,4 +1,3 @@
-import User from './models/User';
 import username from './helpers/username';
 import extract from './utils/extract';

@@ -67,27 +66,43 @@ export default class Translator {
    const hydrated = [];
    const open = [hydrated];

-    translation.forEach(part => {
+    translation.forEach((part) => {
      const match = part.match(new RegExp('{([a-z0-9_]+)}|<(/?)([a-z0-9_]+)>', 'i'));

      if (match) {
+        // Either an opening or closing tag.
        if (match[1]) {
          open[0].push(input[match[1]]);
        } else if (match[3]) {
          if (match[2]) {
+            // Closing tag. We start by removing all raw children (generally in the form of strings) from the temporary
+            // holding array, then run them through m.fragment to convert them to vnodes. Usually this will just give us a
+            // text vnode, but using m.fragment as opposed to an explicit conversion should be more flexible. This is necessary because
+            // otherwise, our generated vnode will have raw strings as its children, and mithril expects vnodes.
+            // Finally, we add the now-processed vnodes back onto the holding array (which is the same object in memory as the
+            // children array of the vnode we are currently processing), and remove the reference to the holding array so that
+            // further text will be added to the full set of returned elements.
+            const rawChildren = open[0].splice(0, open[0].length);
+            open[0].push(...m.fragment(rawChildren).children);
            open.shift();
          } else {
-            let tag = input[match[3]] || {tag: match[3], children: []};
+            // If a vnode with a matching tag was provided in the translator input, we use that. Otherwise, we create a new vnode
+            // with this tag, and an empty children array (since we're expecting to insert children, as that's the point of having this in translator)
+            let tag = input[match[3]] || { tag: match[3], children: [] };
            open[0].push(tag);
+            // Insert the tag's children array as the first element of open, so that text in between the opening
+            // and closing tags will be added to the tag's children, not to the full set of returned elements.
            open.unshift(tag.children || tag);
          }
        }
      } else {
+        // Not an html tag, we add it to open[0], which is either the full set of returned elements (vnodes and text),
+        // or if an html tag is currently being processed, the children attribute of that html tag's vnode.
        open[0].push(part);
      }
    });

-    return hydrated.filter(part => part);
+    return hydrated.filter((part) => part);
  }

  pluralize(translation, number) {
@@ -97,7 +112,7 @@ export default class Translator {
      standardRules = [],
      explicitRules = [];

-    translation.split('|').forEach(part => {
+    translation.split('|').forEach((part) => {
      if (cPluralRegex.test(part)) {
        const matches = part.match(cPluralRegex);
        explicitRules[matches[0]] = matches[matches.length - 1];
@@ -122,11 +137,13 @@ export default class Translator {
            }
          }
        } else {
-          var leftNumber  = this.convertNumber(matches[4]);
+          var leftNumber = this.convertNumber(matches[4]);
          var rightNumber = this.convertNumber(matches[5]);

-          if (('[' === matches[3] ? number >= leftNumber : number > leftNumber) &&
-            (']' === matches[6] ? number <= rightNumber : number < rightNumber)) {
+          if (
+            ('[' === matches[3] ? number >= leftNumber : number > leftNumber) &&
+            (']' === matches[6] ? number <= rightNumber : number < rightNumber)
+          ) {
            return explicitRules[e];
          }
        }
@@ -223,7 +240,7 @@ export default class Translator {
      case 'tr':
      case 'ur':
      case 'zu':
-        return (number == 1) ? 0 : 1;
+        return number == 1 ? 0 : 1;

      case 'am':
      case 'bh':
@@ -237,7 +254,7 @@ export default class Translator {
      case 'xbr':
      case 'ti':
      case 'wa':
-        return ((number === 0) || (number == 1)) ? 0 : 1;
+        return number === 0 || number == 1 ? 0 : 1;

      case 'be':
      case 'bs':
@@ -245,41 +262,41 @@ export default class Translator {
      case 'ru':
      case 'sr':
      case 'uk':
-        return ((number % 10 == 1) && (number % 100 != 11)) ? 0 : (((number % 10 >= 2) && (number % 10 <= 4) && ((number % 100 < 10) || (number % 100 >= 20))) ? 1 : 2);
+        return number % 10 == 1 && number % 100 != 11 ? 0 : number % 10 >= 2 && number % 10 <= 4 && (number % 100 < 10 || number % 100 >= 20) ? 1 : 2;

      case 'cs':
      case 'sk':
-        return (number == 1) ? 0 : (((number >= 2) && (number <= 4)) ? 1 : 2);
+        return number == 1 ? 0 : number >= 2 && number <= 4 ? 1 : 2;

      case 'ga':
-        return (number == 1) ? 0 : ((number == 2) ? 1 : 2);
+        return number == 1 ? 0 : number == 2 ? 1 : 2;

      case 'lt':
-        return ((number % 10 == 1) && (number % 100 != 11)) ? 0 : (((number % 10 >= 2) && ((number % 100 < 10) || (number % 100 >= 20))) ? 1 : 2);
+        return number % 10 == 1 && number % 100 != 11 ? 0 : number % 10 >= 2 && (number % 100 < 10 || number % 100 >= 20) ? 1 : 2;

      case 'sl':
-        return (number % 100 == 1) ? 0 : ((number % 100 == 2) ? 1 : (((number % 100 == 3) || (number % 100 == 4)) ? 2 : 3));
+        return number % 100 == 1 ? 0 : number % 100 == 2 ? 1 : number % 100 == 3 || number % 100 == 4 ? 2 : 3;

      case 'mk':
-        return (number % 10 == 1) ? 0 : 1;
+        return number % 10 == 1 ? 0 : 1;

      case 'mt':
-        return (number == 1) ? 0 : (((number === 0) || ((number % 100 > 1) && (number % 100 < 11))) ? 1 : (((number % 100 > 10) && (number % 100 < 20)) ? 2 : 3));
+        return number == 1 ? 0 : number === 0 || (number % 100 > 1 && number % 100 < 11) ? 1 : number % 100 > 10 && number % 100 < 20 ? 2 : 3;

      case 'lv':
-        return (number === 0) ? 0 : (((number % 10 == 1) && (number % 100 != 11)) ? 1 : 2);
+        return number === 0 ? 0 : number % 10 == 1 && number % 100 != 11 ? 1 : 2;

      case 'pl':
-        return (number == 1) ? 0 : (((number % 10 >= 2) && (number % 10 <= 4) && ((number % 100 < 12) || (number % 100 > 14))) ? 1 : 2);
+        return number == 1 ? 0 : number % 10 >= 2 && number % 10 <= 4 && (number % 100 < 12 || number % 100 > 14) ? 1 : 2;

      case 'cy':
-        return (number == 1) ? 0 : ((number == 2) ? 1 : (((number == 8) || (number == 11)) ? 2 : 3));
+        return number == 1 ? 0 : number == 2 ? 1 : number == 8 || number == 11 ? 2 : 3;

      case 'ro':
-        return (number == 1) ? 0 : (((number === 0) || ((number % 100 > 0) && (number % 100 < 20))) ? 1 : 2);
+        return number == 1 ? 0 : number === 0 || (number % 100 > 0 && number % 100 < 20) ? 1 : 2;

      case 'ar':
-        return (number === 0) ? 0 : ((number == 1) ? 1 : ((number == 2) ? 2 : (((number >= 3) && (number <= 10)) ? 3 : (((number >= 11) && (number <= 99)) ? 4 : 5))));
+        return number === 0 ? 0 : number == 1 ? 1 : number == 2 ? 2 : number >= 3 && number <= 10 ? 3 : number >= 11 && number <= 99 ? 4 : 5;

      default:
        return 0;
--- a/js/src/common/compat.js
+++ b/js/src/common/compat.js
@@ -12,15 +12,19 @@ import anchorScroll from './utils/anchorScroll';
 import RequestError from './utils/RequestError';
 import abbreviateNumber from './utils/abbreviateNumber';
 import * as string from './utils/string';
+import Stream from './utils/Stream';
 import SubtreeRetainer from './utils/SubtreeRetainer';
+import setRouteWithForcedRefresh from './utils/setRouteWithForcedRefresh';
 import extract from './utils/extract';
 import ScrollListener from './utils/ScrollListener';
 import stringToColor from './utils/stringToColor';
+import subclassOf from './utils/subclassOf';
 import patchMithril from './utils/patchMithril';
 import classList from './utils/classList';
 import extractText from './utils/extractText';
 import formatNumber from './utils/formatNumber';
 import mapRoutes from './utils/mapRoutes';
+import withAttr from './utils/withAttr';
 import Notification from './models/Notification';
 import User from './models/User';
 import Post from './models/Post';
@@ -30,6 +34,7 @@ import Forum from './models/Forum';
 import Component from './Component';
 import Translator from './Translator';
 import AlertManager from './components/AlertManager';
+import Page from './components/Page';
 import Switch from './components/Switch';
 import Badge from './components/Badge';
 import LoadingIndicator from './components/LoadingIndicator';
@@ -42,6 +47,7 @@ import FieldSet from './components/FieldSet';
 import Select from './components/Select';
 import Navigation from './components/Navigation';
 import Alert from './components/Alert';
+import Link from './components/Link';
 import LinkButton from './components/LinkButton';
 import Checkbox from './components/Checkbox';
 import SelectDropdown from './components/SelectDropdown';
@@ -60,11 +66,12 @@ import highlight from './helpers/highlight';
 import username from './helpers/username';
 import userOnline from './helpers/userOnline';
 import listItems from './helpers/listItems';
+import Fragment from './Fragment';

 export default {
-  'extend': extend,
-  'Session': Session,
-  'Store': Store,
+  extend: extend,
+  Session: Session,
+  Store: Store,
  'utils/evented': evented,
  'utils/liveHumanTimes': liveHumanTimes,
  'utils/ItemList': ItemList,
@@ -80,20 +87,26 @@ export default {
  'utils/extract': extract,
  'utils/ScrollListener': ScrollListener,
  'utils/stringToColor': stringToColor,
+  'utils/Stream': Stream,
+  'utils/subclassOf': subclassOf,
+  'utils/setRouteWithForcedRefresh': setRouteWithForcedRefresh,
  'utils/patchMithril': patchMithril,
  'utils/classList': classList,
  'utils/extractText': extractText,
  'utils/formatNumber': formatNumber,
  'utils/mapRoutes': mapRoutes,
+  'utils/withAttr': withAttr,
  'models/Notification': Notification,
  'models/User': User,
  'models/Post': Post,
  'models/Discussion': Discussion,
  'models/Group': Group,
  'models/Forum': Forum,
-  'Component': Component,
-  'Translator': Translator,
+  Component: Component,
+  Fragment: Fragment,
+  Translator: Translator,
  'components/AlertManager': AlertManager,
+  'components/Page': Page,
  'components/Switch': Switch,
  'components/Badge': Badge,
  'components/LoadingIndicator': LoadingIndicator,
@@ -106,6 +119,7 @@ export default {
  'components/Select': Select,
  'components/Navigation': Navigation,
  'components/Alert': Alert,
+  'components/Link': Link,
  'components/LinkButton': LinkButton,
  'components/Checkbox': Checkbox,
  'components/SelectDropdown': SelectDropdown,
@@ -113,8 +127,8 @@ export default {
  'components/Button': Button,
  'components/Modal': Modal,
  'components/GroupBadge': GroupBadge,
-  'Model': Model,
-  'Application': Application,
+  Model: Model,
+  Application: Application,
  'helpers/fullTime': fullTime,
  'helpers/avatar': avatar,
  'helpers/icon': icon,
@@ -123,5 +137,5 @@ export default {
  'helpers/highlight': highlight,
  'helpers/username': username,
  'helpers/userOnline': userOnline,
-  'helpers/listItems': listItems
+  'helpers/listItems': listItems,
 };
--- a/js/src/common/components/Alert.js
+++ b/js/src/common/components/Alert.js
@@ -1,57 +0,0 @@
-import Component from '../Component';
-import Button from './Button';
-import listItems from '../helpers/listItems';
-import extract from '../utils/extract';
-
-/**
- * The `Alert` component represents an alert box, which contains a message,
- * some controls, and may be dismissible.
- *
- * The alert may have the following special props:
- *
- * - `type` The type of alert this is. Will be used to give the alert a class
- *   name of `Alert--{type}`.
- * - `controls` An array of controls to show in the alert.
- * - `dismissible` Whether or not the alert can be dismissed.
- * - `ondismiss` A callback to run when the alert is dismissed.
- *
- * All other props will be assigned as attributes on the alert element.
- */
-export default class Alert extends Component {
-  view() {
-    const attrs = Object.assign({}, this.props);
-
-    const type = extract(attrs, 'type');
-    attrs.className = 'Alert Alert--' + type + ' ' + (attrs.className || '');
-
-    const children = extract(attrs, 'children');
-    const controls = extract(attrs, 'controls') || [];
-
-    // If the alert is meant to be dismissible (which is the case by default),
-    // then we will create a dismiss button to append as the final control in
-    // the alert.
-    const dismissible = extract(attrs, 'dismissible');
-    const ondismiss = extract(attrs, 'ondismiss');
-    const dismissControl = [];
-
-    if (dismissible || dismissible === undefined) {
-      dismissControl.push(
-        <Button
-          icon="fas fa-times"
-          className="Button Button--link Button--icon Alert-dismiss"
-          onclick={ondismiss}/>
-      );
-    }
-
-    return (
-      <div {...attrs}>
-        <span className="Alert-body">
-          {children}
-        </span>
-        <ul className="Alert-controls">
-          {listItems(controls.concat(dismissControl))}
-        </ul>
-      </div>
-    );
-  }
-}
--- a/js/src/common/components/Alert.tsx
+++ b/js/src/common/components/Alert.tsx
@@ -0,0 +1,50 @@
+import Component, { ComponentAttrs } from '../Component';
+import Button from './Button';
+import listItems from '../helpers/listItems';
+import extract from '../utils/extract';
+import Mithril from 'mithril';
+
+export interface AlertAttrs extends ComponentAttrs {
+  /** The type of alert this is. Will be used to give the alert a class name of `Alert--{type}`. */
+  type?: string;
+  /** An array of controls to show in the alert. */
+  controls?: Mithril.Children;
+  /** Whether or not the alert can be dismissed. */
+  dismissible?: boolean;
+  /** A callback to run when the alert is dismissed */
+  ondismiss?: Function;
+}
+
+/**
+ * The `Alert` component represents an alert box, which contains a message,
+ * some controls, and may be dismissible.
+ */
+export default class Alert<T extends AlertAttrs = AlertAttrs> extends Component<T> {
+  view(vnode: Mithril.Vnode) {
+    const attrs = Object.assign({}, this.attrs);
+
+    const type = extract(attrs, 'type');
+    attrs.className = 'Alert Alert--' + type + ' ' + (attrs.className || '');
+
+    const content = extract(attrs, 'content') || vnode.children;
+    const controls = (extract(attrs, 'controls') || []) as Mithril.ChildArray;
+
+    // If the alert is meant to be dismissible (which is the case by default),
+    // then we will create a dismiss button to append as the final control in
+    // the alert.
+    const dismissible = extract(attrs, 'dismissible');
+    const ondismiss = extract(attrs, 'ondismiss');
+    const dismissControl = [];
+
+    if (dismissible || dismissible === undefined) {
+      dismissControl.push(<Button icon="fas fa-times" className="Button Button--link Button--icon Alert-dismiss" onclick={ondismiss} />);
+    }
+
+    return (
+      <div {...attrs}>
+        <span className="Alert-body">{content}</span>
+        <ul className="Alert-controls">{listItems(controls.concat(dismissControl))}</ul>
+      </div>
+    );
+  }
+}
--- a/js/src/common/components/AlertManager.js
+++ b/js/src/common/components/AlertManager.js
@@ -6,70 +6,23 @@ import Alert from './Alert';
 * be shown and dismissed.
 */
 export default class AlertManager extends Component {
-  init() {
-    /**
-     * An array of Alert components which are currently showing.
-     *
-     * @type {Alert[]}
-     * @protected
-     */
-    this.components = [];
+  oninit(vnode) {
+    super.oninit(vnode);
+
+    this.state = this.attrs.state;
  }

  view() {
    return (
      <div className="AlertManager">
-        {this.components.map(component => <div className="AlertManager-alert">{component}</div>)}
+        {Object.entries(this.state.getActiveAlerts()).map(([key, alert]) => (
+          <div className="AlertManager-alert">
+            <alert.componentClass {...alert.attrs} ondismiss={this.state.dismiss.bind(this.state, key)}>
+              {alert.children}
+            </alert.componentClass>
+          </div>
+        ))}
      </div>
    );
  }
-
-  config(isInitialized, context) {
-    // Since this component is 'above' the content of the page (that is, it is a
-    // part of the global UI that persists between routes), we will flag the DOM
-    // to be retained across route changes.
-    context.retain = true;
-  }
-
-  /**
-   * Show an Alert in the alerts area.
-   *
-   * @param {Alert} component
-   * @public
-   */
-  show(component) {
-    if (!(component instanceof Alert)) {
-      throw new Error('The AlertManager component can only show Alert components');
-    }
-
-    component.props.ondismiss = this.dismiss.bind(this, component);
-
-    this.components.push(component);
-    m.redraw();
-  }
-
-  /**
-   * Dismiss an alert.
-   *
-   * @param {Alert} component
-   * @public
-   */
-  dismiss(component) {
-    const index = this.components.indexOf(component);
-
-    if (index !== -1) {
-      this.components.splice(index, 1);
-      m.redraw();
-    }
-  }
-
-  /**
-   * Clear all alerts.
-   *
-   * @public
-   */
-  clear() {
-    this.components = [];
-    m.redraw();
-  }
 }
--- a/js/src/common/components/Badge.js
+++ b/js/src/common/components/Badge.js
@@ -6,34 +6,30 @@ import extract from '../utils/extract';
 * The `Badge` component represents a user/discussion badge, indicating some
 * status (e.g. a discussion is stickied, a user is an admin).
 *
- * A badge may have the following special props:
+ * A badge may have the following special attrs:
 *
 * - `type` The type of badge this is. This will be used to give the badge a
 *   class name of `Badge--{type}`.
 * - `icon` The name of an icon to show inside the badge.
 * - `label`
 *
- * All other props will be assigned as attributes on the badge element.
+ * All other attrs will be assigned as attributes on the badge element.
 */
 export default class Badge extends Component {
  view() {
-    const attrs = Object.assign({}, this.props);
+    const attrs = Object.assign({}, this.attrs);
    const type = extract(attrs, 'type');
    const iconName = extract(attrs, 'icon');

    attrs.className = 'Badge ' + (type ? 'Badge--' + type : '') + ' ' + (attrs.className || '');
    attrs.title = extract(attrs, 'label') || '';

-    return (
-      <span {...attrs}>
-        {iconName ? icon(iconName, {className: 'Badge-icon'}) : m.trust('&nbsp;')}
-      </span>
-    );
+    return <span {...attrs}>{iconName ? icon(iconName, { className: 'Badge-icon' }) : m.trust('&nbsp;')}</span>;
  }

-  config(isInitialized) {
-    if (isInitialized) return;
+  oncreate(vnode) {
+    super.oncreate(vnode);

-    if (this.props.label) this.$().tooltip({container: 'body'});
+    if (this.attrs.label) this.$().tooltip();
  }
 }
--- a/js/src/common/components/Button.js
+++ b/js/src/common/components/Button.js
@@ -1,12 +1,15 @@
 import Component from '../Component';
 import icon from '../helpers/icon';
+import classList from '../utils/classList';
 import extract from '../utils/extract';
 import extractText from '../utils/extractText';
 import LoadingIndicator from './LoadingIndicator';

 /**
 * The `Button` component defines an element which, when clicked, performs an
- * action. The button may have the following special props:
+ * action.
+ *
+ * ### Attrs
 *
 * - `icon` The name of the icon class. If specified, the button will be given a
 *   'has-icon' class name.
@@ -15,41 +18,38 @@ import LoadingIndicator from './LoadingIndicator';
 *   removed.
 * - `loading` Whether or not the button should be in a disabled loading state.
 *
- * All other props will be assigned as attributes on the button element.
+ * All other attrs will be assigned as attributes on the button element.
 *
 * Note that a Button has no default class names. This is because a Button can
 * be used to represent any generic clickable control, like a menu item.
 */
 export default class Button extends Component {
-  view() {
-    const attrs = Object.assign({}, this.props);
+  view(vnode) {
+    const attrs = Object.assign({}, this.attrs);

-    delete attrs.children;
-
-    attrs.className = attrs.className || '';
    attrs.type = attrs.type || 'button';

    // If a tooltip was provided for buttons without additional content, we also
    // use this tooltip as text for screen readers
-    if (attrs.title && !this.props.children) {
+    if (attrs.title && !vnode.children) {
      attrs['aria-label'] = attrs.title;
    }

    // If nothing else is provided, we use the textual button content as tooltip
-    if (!attrs.title && this.props.children) {
-      attrs.title = extractText(this.props.children);
+    if (!attrs.title && vnode.children) {
+      attrs.title = extractText(vnode.children);
    }

    const iconName = extract(attrs, 'icon');
-    if (iconName) attrs.className += ' hasIcon';

    const loading = extract(attrs, 'loading');
    if (attrs.disabled || loading) {
-      attrs.className += ' disabled' + (loading ? ' loading' : '');
      delete attrs.onclick;
    }

-    return <button {...attrs}>{this.getButtonContent()}</button>;
+    attrs.className = classList([attrs.className, iconName && 'hasIcon', (attrs.disabled || loading) && 'disabled', loading && 'loading']);
+
+    return <button {...attrs}>{this.getButtonContent(vnode.children)}</button>;
  }

  /**
@@ -58,13 +58,13 @@ export default class Button extends Component {
   * @return {*}
   * @protected
   */
-  getButtonContent() {
-    const iconName = this.props.icon;
+  getButtonContent(children) {
+    const iconName = this.attrs.icon;

    return [
-      iconName && iconName !== true ? icon(iconName, {className: 'Button-icon'}) : '',
-      this.props.children ? <span className="Button-label">{this.props.children}</span> : '',
-      this.props.loading ? LoadingIndicator.component({size: 'tiny', className: 'LoadingIndicator--inline'}) : ''
+      iconName && iconName !== true ? icon(iconName, { className: 'Button-icon' }) : '',
+      children ? <span className="Button-label">{children}</span> : '',
+      this.attrs.loading ? <LoadingIndicator size="tiny" className="LoadingIndicator--inline" /> : '',
    ];
  }
 }
--- a/js/src/common/components/Checkbox.js
+++ b/js/src/common/components/Checkbox.js
@@ -1,44 +1,40 @@
 import Component from '../Component';
 import LoadingIndicator from './LoadingIndicator';
 import icon from '../helpers/icon';
+import classList from '../utils/classList';
+import withAttr from '../utils/withAttr';

 /**
 * The `Checkbox` component defines a checkbox input.
 *
- * ### Props
+ * ### Attrs
 *
 * - `state` Whether or not the checkbox is checked.
 * - `className` The class name for the root element.
 * - `disabled` Whether or not the checkbox is disabled.
+ * - `loading` Whether or not the checkbox is loading.
 * - `onchange` A callback to run when the checkbox is checked/unchecked.
 * - `children` A text label to display next to the checkbox.
 */
 export default class Checkbox extends Component {
-  init() {
-    /**
-     * Whether or not the checkbox's value is in the process of being saved.
-     *
-     * @type {Boolean}
-     * @public
-     */
-    this.loading = false;
-  }
+  view(vnode) {
+    // Sometimes, false is stored in the DB as '0'. This is a temporary
+    // conversion layer until a more robust settings encoding is introduced
+    if (this.attrs.state === '0') this.attrs.state = false;

-  view() {
-    let className = 'Checkbox ' + (this.props.state ? 'on' : 'off') + ' ' + (this.props.className || '');
-    if (this.loading) className += ' loading';
-    if (this.props.disabled) className += ' disabled';
+    const className = classList([
+      'Checkbox',
+      this.attrs.state ? 'on' : 'off',
+      this.attrs.className,
+      this.attrs.loading && 'loading',
+      this.attrs.disabled && 'disabled',
+    ]);

    return (
      <label className={className}>
-        <input type="checkbox"
-          checked={this.props.state}
-          disabled={this.props.disabled}
-          onchange={m.withAttr('checked', this.onchange.bind(this))}/>
-        <div className="Checkbox-display">
-          {this.getDisplay()}
-        </div>
-        {this.props.children}
+        <input type="checkbox" checked={this.attrs.state} disabled={this.attrs.disabled} onchange={withAttr('checked', this.onchange.bind(this))} />
+        <div className="Checkbox-display">{this.getDisplay()}</div>
+        {vnode.children}
      </label>
    );
  }
@@ -50,9 +46,7 @@ export default class Checkbox extends Component {
   * @protected
   */
  getDisplay() {
-    return this.loading
-      ? LoadingIndicator.component({size: 'tiny'})
-      : icon(this.props.state ? 'fas fa-check' : 'fas fa-times');
+    return this.attrs.loading ? <LoadingIndicator size="tiny" /> : icon(this.attrs.state ? 'fas fa-check' : 'fas fa-times');
  }

  /**
@@ -62,6 +56,6 @@ export default class Checkbox extends Component {
   * @protected
   */
  onchange(checked) {
-    if (this.props.onchange) this.props.onchange(checked, this);
+    if (this.attrs.onchange) this.attrs.onchange(checked, this);
  }
 }
--- a/js/src/common/components/ConfirmDocumentUnload.js
+++ b/js/src/common/components/ConfirmDocumentUnload.js
@@ -0,0 +1,40 @@
+import Component from '../Component';
+
+/**
+ * The `ConfirmDocumentUnload` component can be used to register a global
+ * event handler that prevents closing the browser window/tab based on the
+ * return value of a given callback prop.
+ *
+ * ### Attrs
+ *
+ * - `when` - a callback returning true when the browser should prompt for
+ *            confirmation before closing the window/tab
+ *
+ * ### Children
+ *
+ * NOTE: Only the first child will be rendered. (Use this component to wrap
+ * another component / DOM element.)
+ *
+ */
+export default class ConfirmDocumentUnload extends Component {
+  handler() {
+    return this.attrs.when() || undefined;
+  }
+
+  oncreate(vnode) {
+    super.oncreate(vnode);
+
+    this.boundHandler = this.handler.bind(this);
+    $(window).on('beforeunload', this.boundHandler);
+  }
+
+  onremove() {
+    $(window).off('beforeunload', this.boundHandler);
+  }
+
+  view(vnode) {
+    // To avoid having to render another wrapping <div> here, we assume that
+    // this component is only wrapped around a single element / component.
+    return vnode.children[0];
+  }
+}
--- a/js/src/common/components/Dropdown.js
+++ b/js/src/common/components/Dropdown.js
@@ -6,7 +6,7 @@ import listItems from '../helpers/listItems';
 * The `Dropdown` component displays a button which, when clicked, shows a
 * dropdown menu beneath it.
 *
- * ### Props
+ * ### Attrs
 *
 * - `buttonClassName` A class name to apply to the dropdown toggle button.
 * - `menuClassName` A class name to apply to the dropdown menu.
@@ -19,33 +19,33 @@ import listItems from '../helpers/listItems';
 * The children will be displayed as a list inside of the dropdown menu.
 */
 export default class Dropdown extends Component {
-  static initProps(props) {
-    super.initProps(props);
-
-    props.className = props.className || '';
-    props.buttonClassName = props.buttonClassName || '';
-    props.menuClassName = props.menuClassName || '';
-    props.label = props.label || '';
-    props.caretIcon = typeof props.caretIcon !== 'undefined' ? props.caretIcon : 'fas fa-caret-down';
+  static initAttrs(attrs) {
+    attrs.className = attrs.className || '';
+    attrs.buttonClassName = attrs.buttonClassName || '';
+    attrs.menuClassName = attrs.menuClassName || '';
+    attrs.label = attrs.label || '';
+    attrs.caretIcon = typeof attrs.caretIcon !== 'undefined' ? attrs.caretIcon : 'fas fa-caret-down';
  }

-  init() {
+  oninit(vnode) {
+    super.oninit(vnode);
+
    this.showing = false;
  }

-  view() {
-    const items = this.props.children ? listItems(this.props.children) : [];
+  view(vnode) {
+    const items = vnode.children ? listItems(vnode.children) : [];

    return (
-      <div className={'ButtonGroup Dropdown dropdown ' + this.props.className + ' itemCount' + items.length + (this.showing ? ' open' : '')}>
-        {this.getButton()}
+      <div className={'ButtonGroup Dropdown dropdown ' + this.attrs.className + ' itemCount' + items.length + (this.showing ? ' open' : '')}>
+        {this.getButton(vnode.children)}
        {this.getMenu(items)}
      </div>
    );
  }

-  config(isInitialized) {
-    if (isInitialized) return;
+  oncreate(vnode) {
+    super.oncreate(vnode);

    // When opening the dropdown menu, work out if the menu goes beyond the
    // bottom of the viewport. If it does, we will apply class to make it show
@@ -53,8 +53,8 @@ export default class Dropdown extends Component {
    this.$().on('shown.bs.dropdown', () => {
      this.showing = true;

-      if (this.props.onshow) {
-        this.props.onshow();
+      if (this.attrs.onshow) {
+        this.attrs.onshow();
      }

      m.redraw();
@@ -64,26 +64,20 @@ export default class Dropdown extends Component {

      $menu.removeClass('Dropdown-menu--top Dropdown-menu--right');

-      $menu.toggleClass(
-        'Dropdown-menu--top',
-        $menu.offset().top + $menu.height() > $(window).scrollTop() + $(window).height()
-      );
+      $menu.toggleClass('Dropdown-menu--top', $menu.offset().top + $menu.height() > $(window).scrollTop() + $(window).height());

      if ($menu.offset().top < 0) {
        $menu.removeClass('Dropdown-menu--top');
      }

-      $menu.toggleClass(
-        'Dropdown-menu--right',
-        isRight || $menu.offset().left + $menu.width() > $(window).scrollLeft() + $(window).width()
-      );
+      $menu.toggleClass('Dropdown-menu--right', isRight || $menu.offset().left + $menu.width() > $(window).scrollLeft() + $(window).width());
    });

    this.$().on('hidden.bs.dropdown', () => {
      this.showing = false;

-      if (this.props.onhide) {
-        this.props.onhide();
+      if (this.attrs.onhide) {
+        this.attrs.onhide();
      }

      m.redraw();
@@ -96,13 +90,10 @@ export default class Dropdown extends Component {
   * @return {*}
   * @protected
   */
-  getButton() {
+  getButton(children) {
    return (
-      <button
-        className={'Dropdown-toggle ' + this.props.buttonClassName}
-        data-toggle="dropdown"
-        onclick={this.props.onclick}>
-        {this.getButtonContent()}
+      <button className={'Dropdown-toggle ' + this.attrs.buttonClassName} data-toggle="dropdown" onclick={this.attrs.onclick}>
+        {this.getButtonContent(children)}
      </button>
    );
  }
@@ -113,19 +104,15 @@ export default class Dropdown extends Component {
   * @return {*}
   * @protected
   */
-  getButtonContent() {
+  getButtonContent(children) {
    return [
-      this.props.icon ? icon(this.props.icon, {className: 'Button-icon'}) : '',
-      <span className="Button-label">{this.props.label}</span>,
-      this.props.caretIcon ? icon(this.props.caretIcon, {className: 'Button-caret'}) : ''
+      this.attrs.icon ? icon(this.attrs.icon, { className: 'Button-icon' }) : '',
+      <span className="Button-label">{this.attrs.label}</span>,
+      this.attrs.caretIcon ? icon(this.attrs.caretIcon, { className: 'Button-caret' }) : '',
    ];
  }

  getMenu(items) {
-    return (
-      <ul className={'Dropdown-menu dropdown-menu ' + this.props.menuClassName}>
-        {items}
-      </ul>
-    );
+    return <ul className={'Dropdown-menu dropdown-menu ' + this.attrs.menuClassName}>{items}</ul>;
  }
 }
--- a/js/src/common/components/FieldSet.js
+++ b/js/src/common/components/FieldSet.js
@@ -11,11 +11,11 @@ import listItems from '../helpers/listItems';
 * The children should be an array of items to show in the fieldset.
 */
 export default class FieldSet extends Component {
-  view() {
+  view(vnode) {
    return (
-      <fieldset className={this.props.className}>
-        <legend>{this.props.label}</legend>
-        <ul>{listItems(this.props.children)}</ul>
+      <fieldset className={this.attrs.className}>
+        <legend>{this.attrs.label}</legend>
+        <ul>{listItems(vnode.children)}</ul>
      </fieldset>
    );
  }
--- a/js/src/common/components/GroupBadge.js
+++ b/js/src/common/components/GroupBadge.js
@@ -1,16 +1,16 @@
 import Badge from './Badge';

 export default class GroupBadge extends Badge {
-  static initProps(props) {
-    super.initProps(props);
+  static initAttrs(attrs) {
+    super.initAttrs(attrs);

-    if (props.group) {
-      props.icon = props.group.icon();
-      props.style = {backgroundColor: props.group.color()};
-      props.label = typeof props.label === 'undefined' ? props.group.nameSingular() : props.label;
-      props.type = 'group--' + props.group.id();
+    if (attrs.group) {
+      attrs.icon = attrs.group.icon();
+      attrs.style = { backgroundColor: attrs.group.color() };
+      attrs.label = typeof attrs.label === 'undefined' ? attrs.group.nameSingular() : attrs.label;
+      attrs.type = 'group--' + attrs.group.id();

-      delete props.group;
+      delete attrs.group;
    }
  }
 }
--- a/js/src/common/components/Link.js
+++ b/js/src/common/components/Link.js
@@ -0,0 +1,47 @@
+import Component from '../Component';
+import extract from '../utils/extract';
+
+/**
+ * The link component enables both internal and external links.
+ * It will return a regular HTML link for any links to external sites,
+ * and it will use Mithril's m.route.Link for any internal links.
+ *
+ * Links will default to internal; the 'external' attr must be set to
+ * `true` for the link to be external.
+ */
+export default class Link extends Component {
+  view(vnode) {
+    let { options = {}, ...attrs } = vnode.attrs;
+
+    attrs.href = attrs.href || '';
+
+    // For some reason, m.route.Link does not like vnode.text, so if present, we
+    // need to convert it to text vnodes and store it in children.
+    const children = vnode.children || { tag: '#', children: vnode.text };
+
+    if (attrs.external) {
+      return <a {...attrs}>{children}</a>;
+    }
+
+    // If the href URL of the link is the same as the current page path
+    // we will not add a new entry to the browser history.
+    // This allows us to still refresh the Page component
+    // without adding endless history entries.
+    if (attrs.href === m.route.get()) {
+      if (!('replace' in options)) options.replace = true;
+    }
+
+    // Mithril 2 does not completely rerender the page if a route change leads to the same route
+    // (or the same component handling a different route).
+    // Here, the `force` parameter will use Mithril's key system to force a full rerender
+    // see https://mithril.js.org/route.html#key-parameter
+    if (extract(attrs, 'force')) {
+      if (!('state' in options)) options.state = {};
+      if (!('key' in options.state)) options.state.key = Date.now();
+    }
+
+    attrs.options = options;
+
+    return <m.route.Link {...attrs}>{children}</m.route.Link>;
+  }
+}
--- a/js/src/common/components/LinkButton.js
+++ b/js/src/common/components/LinkButton.js
@@ -1,11 +1,12 @@
 import Button from './Button';
+import Link from './Link';

 /**
 * The `LinkButton` component defines a `Button` which links to a route.
 *
- * ### Props
+ * ### Attrs
 *
- * All of the props accepted by `Button`, plus:
+ * All of the attrs accepted by `Button`, plus:
 *
 * - `active` Whether or not the page that this button links to is currently
 *   active.
@@ -13,28 +14,28 @@ import Button from './Button';
 *   the `active` prop will automatically be set to true.
 */
 export default class LinkButton extends Button {
-  static initProps(props) {
-    props.active = this.isActive(props);
-    props.config = props.config || m.route;
+  static initAttrs(attrs) {
+    super.initAttrs(attrs);
+
+    attrs.active = this.isActive(attrs);
  }

-  view() {
-    const vdom = super.view();
+  view(vnode) {
+    const vdom = super.view(vnode);

-    vdom.tag = 'a';
+    vdom.tag = Link;
+    vdom.attrs.active = String(vdom.attrs.active);

    return vdom;
  }

  /**
-   * Determine whether a component with the given props is 'active'.
+   * Determine whether a component with the given attrs is 'active'.
   *
-   * @param {Object} props
+   * @param {Object} attrs
   * @return {Boolean}
   */
-  static isActive(props) {
-    return typeof props.active !== 'undefined'
-      ? props.active
-      : m.route() === props.href;
+  static isActive(attrs) {
+    return typeof attrs.active !== 'undefined' ? attrs.active : m.route.get() === attrs.href;
  }
 }
--- a/js/src/common/components/LoadingIndicator.js
+++ b/js/src/common/components/LoadingIndicator.js
@@ -2,16 +2,17 @@ import Component from '../Component';
 import { Spinner } from 'spin.js';

 /**
- * The `LoadingIndicator` component displays a loading spinner with spin.js. It
- * may have the following special props:
+ * The `LoadingIndicator` component displays a loading spinner with spin.js.
+ *
+ * ### Attrs
 *
 * - `size` The spin.js size preset to use. Defaults to 'small'.
 *
- * All other props will be assigned as attributes on the element.
+ * All other attrs will be assigned as attributes on the DOM element.
 */
 export default class LoadingIndicator extends Component {
  view() {
-    const attrs = Object.assign({}, this.props);
+    const attrs = Object.assign({}, this.attrs);

    attrs.className = 'LoadingIndicator ' + (attrs.className || '');
    delete attrs.size;
@@ -19,12 +20,12 @@ export default class LoadingIndicator extends Component {
    return <div {...attrs}>{m.trust('&nbsp;')}</div>;
  }

-  config(isInitialized) {
-    if (isInitialized) return;
+  oncreate(vnode) {
+    super.oncreate(vnode);

    const options = { zIndex: 'auto', color: this.$().css('color') };

-    switch (this.props.size) {
+    switch (this.attrs.size) {
      case 'large':
        Object.assign(options, { lines: 10, length: 8, width: 4, radius: 8 });
        break;
--- a/js/src/common/components/Modal.js
+++ b/js/src/common/components/Modal.js
@@ -9,39 +9,62 @@ import Button from './Button';
 * @abstract
 */
 export default class Modal extends Component {
-  init() {
-    /**
-     * An alert component to show below the header.
-     *
-     * @type {Alert}
-     */
-    this.alert = null;
+  /**
+   * Determine whether or not the modal should be dismissible via an 'x' button.
+   */
+  static isDismissible = true;
+
+  /**
+   * Attributes for an alert component to show below the header.
+   *
+   * @type {object}
+   */
+  alertAttrs = null;
+
+  oncreate(vnode) {
+    super.oncreate(vnode);
+
+    this.attrs.animateShow(() => this.onready());
+  }
+
+  onbeforeremove() {
+    // If the global modal state currently contains a modal,
+    // we've just opened up a new one, and accordingly,
+    // we don't need to show a hide animation.
+    if (!this.attrs.state.modal) {
+      this.attrs.animateHide();
+      // Here, we ensure that the animation has time to complete.
+      // See https://mithril.js.org/lifecycle-methods.html#onbeforeremove
+      return new Promise((resolve) => setTimeout(resolve, 1000));
+    }
  }

  view() {
-    if (this.alert) {
-      this.alert.props.dismissible = false;
+    if (this.alertAttrs) {
+      this.alertAttrs.dismissible = false;
    }

    return (
      <div className={'Modal modal-dialog ' + this.className()}>
        <div className="Modal-content">
-          {this.isDismissible() ? (
+          {this.constructor.isDismissible ? (
            <div className="Modal-close App-backControl">
              {Button.component({
                icon: 'fas fa-times',
                onclick: this.hide.bind(this),
-                className: 'Button Button--icon Button--link'
+                className: 'Button Button--icon Button--link',
              })}
            </div>
-          ) : ''}
+          ) : (
+            ''
+          )}

          <form onsubmit={this.onsubmit.bind(this)}>
            <div className="Modal-header">
              <h3 className="App-titleControl App-titleControl--text">{this.title()}</h3>
            </div>

-            {alert ? <div className="Modal-alert">{this.alert}</div> : ''}
+            {this.alertAttrs ? <div className="Modal-alert">{Alert.component(this.alertAttrs)}</div> : ''}

            {this.content()}
          </form>
@@ -50,23 +73,13 @@ export default class Modal extends Component {
    );
  }

-  /**
-   * Determine whether or not the modal should be dismissible via an 'x' button.
-   *
-   * @return {Boolean}
-   */
-  isDismissible() {
-    return true;
-  }
-
  /**
   * Get the class name to apply to the modal.
   *
   * @return {String}
   * @abstract
   */
-  className() {
-  }
+  className() {}

  /**
   * Get the title of the modal dialog.
@@ -74,8 +87,7 @@ export default class Modal extends Component {
   * @return {String}
   * @abstract
   */
-  title() {
-  }
+  title() {}

  /**
   * Get the content of the modal.
@@ -83,16 +95,14 @@ export default class Modal extends Component {
   * @return {VirtualElement}
   * @abstract
   */
-  content() {
-  }
+  content() {}

  /**
   * Handle the modal form's submit event.
   *
   * @param {Event} e
   */
-  onsubmit() {
-  }
+  onsubmit() {}

  /**
   * Focus on the first input when the modal is ready to be used.
@@ -101,14 +111,11 @@ export default class Modal extends Component {
    this.$('form').find('input, select, textarea').first().focus().select();
  }

-  onhide() {
-  }
-
  /**
   * Hide the modal.
   */
  hide() {
-    app.modal.close();
+    this.attrs.state.close();
  }

  /**
@@ -126,7 +133,7 @@ export default class Modal extends Component {
   * @param {RequestError} error
   */
  onerror(error) {
-    this.alert = error.alert;
+    this.alertAttrs = error.alert;

    m.redraw();

--- a/js/src/common/components/ModalManager.js
+++ b/js/src/common/components/ModalManager.js
@@ -1,5 +1,4 @@
 import Component from '../Component';
-import Modal from './Modal';

 /**
 * The `ModalManager` component manages a modal dialog. Only one modal dialog
@@ -7,100 +6,53 @@ import Modal from './Modal';
 * overwrite the previous one.
 */
 export default class ModalManager extends Component {
-  init() {
-    this.showing = false;
-    this.component = null;
-  }
-
  view() {
+    const modal = this.attrs.state.modal;
+
    return (
      <div className="ModalManager modal fade">
-        {this.component && this.component.render()}
+        {modal
+          ? modal.componentClass.component({
+              ...modal.attrs,
+              animateShow: this.animateShow.bind(this),
+              animateHide: this.animateHide.bind(this),
+              state: this.attrs.state,
+            })
+          : ''}
      </div>
    );
  }

-  config(isInitialized, context) {
-    if (isInitialized) return;
+  oncreate(vnode) {
+    super.oncreate(vnode);

-    // Since this component is 'above' the content of the page (that is, it is a
-    // part of the global UI that persists between routes), we will flag the DOM
-    // to be retained across route changes.
-    context.retain = true;
+    // Ensure the modal state is notified about a closed modal, even when the
+    // DOM-based Bootstrap JavaScript code triggered the closing of the modal,
+    // e.g. via ESC key or a click on the modal backdrop.
+    this.$().on('hidden.bs.modal', this.attrs.state.close.bind(this.attrs.state));
+  }
+
+  animateShow(readyCallback) {
+    const dismissible = !!this.attrs.state.modal.componentClass.isDismissible;
+
+    // If we are opening this modal while another modal is already open,
+    // the shown event will not run, because the modal is already open.
+    // So, we need to manually trigger the readyCallback.
+    if (this.$().hasClass('in')) {
+      readyCallback();
+      return;
+    }

    this.$()
-      .on('hidden.bs.modal', this.clear.bind(this))
-      .on('shown.bs.modal', this.onready.bind(this));
+      .one('shown.bs.modal', readyCallback)
+      .modal({
+        backdrop: dismissible || 'static',
+        keyboard: dismissible,
+      })
+      .modal('show');
  }

-  /**
-   * Show a modal dialog.
-   *
-   * @param {Modal} component
-   * @public
-   */
-  show(component) {
-    if (!(component instanceof Modal)) {
-      throw new Error('The ModalManager component can only show Modal components');
-    }
-
-    clearTimeout(this.hideTimeout);
-
-    this.showing = true;
-    this.component = component;
-
-    if (app.current) app.current.retain = true;
-
-    m.redraw(true);
-
-    this.$().modal({backdrop: this.component.isDismissible() ? true : 'static'}).modal('show');
-    this.onready();
-  }
-
-  /**
-   * Close the modal dialog.
-   *
-   * @public
-   */
-  close() {
-    if (!this.showing) return;
-
-    // Don't hide the modal immediately, because if the consumer happens to call
-    // the `show` method straight after to show another modal dialog, it will
-    // cause Bootstrap's modal JS to misbehave. Instead we will wait for a tiny
-    // bit to give the `show` method the opportunity to prevent this from going
-    // ahead.
-    this.hideTimeout = setTimeout(() => {
-      this.$().modal('hide');
-      this.showing = false;
-    });
-  }
-
-  /**
-   * Clear content from the modal area.
-   *
-   * @protected
-   */
-  clear() {
-    if (this.component) {
-      this.component.onhide();
-    }
-
-    this.component = null;
-
-    app.current.retain = false;
-
-    m.lazyRedraw();
-  }
-
-  /**
-   * When the modal dialog is ready to be used, tell it!
-   *
-   * @protected
-   */
-  onready() {
-    if (this.component && this.component.onready) {
-      this.component.onready(this.$());
-    }
+  animateHide() {
+    this.$().modal('hide');
  }
 }
--- a/js/src/common/components/Navigation.js
+++ b/js/src/common/components/Navigation.js
@@ -11,7 +11,7 @@ import LinkButton from './LinkButton';
 * If the app has a pane, it will also include a 'pin' button which toggles the
 * pinned state of the pane.
 *
- * Accepts the following props:
+ * Accepts the following attrs:
 *
 * - `className` The name of a class to set on the root element.
 * - `drawer` Whether or not to show a button to toggle the app's drawer if
@@ -19,26 +19,19 @@ import LinkButton from './LinkButton';
 */
 export default class Navigation extends Component {
  view() {
-    const {history, pane} = app;
+    const { history, pane } = app;

    return (
-      <div className={'Navigation ButtonGroup ' + (this.props.className || '')}
+      <div
+        className={'Navigation ButtonGroup ' + (this.attrs.className || '')}
        onmouseenter={pane && pane.show.bind(pane)}
-        onmouseleave={pane && pane.onmouseleave.bind(pane)}>
-        {history.canGoBack()
-          ? [this.getBackButton(), this.getPaneButton()]
-          : this.getDrawerButton()}
+        onmouseleave={pane && pane.onmouseleave.bind(pane)}
+      >
+        {history.canGoBack() ? [this.getBackButton(), this.getPaneButton()] : this.getDrawerButton()}
      </div>
    );
  }

-  config(isInitialized, context) {
-    // Since this component is 'above' the content of the page (that is, it is a
-    // part of the global UI that persists between routes), we will flag the DOM
-    // to be retained across route changes.
-    context.retain = true;
-  }
-
  /**
   * Get the back button.
   *
@@ -46,7 +39,7 @@ export default class Navigation extends Component {
   * @protected
   */
  getBackButton() {
-    const {history} = app;
+    const { history } = app;
    const previous = history.getPrevious() || {};

    return LinkButton.component({
@@ -54,12 +47,11 @@ export default class Navigation extends Component {
      href: history.backUrl(),
      icon: 'fas fa-chevron-left',
      title: previous.title,
-      config: () => {},
-      onclick: e => {
+      onclick: (e) => {
        if (e.shiftKey || e.ctrlKey || e.metaKey || e.which === 2) return;
        e.preventDefault();
        history.back();
-      }
+      },
    });
  }

@@ -70,14 +62,14 @@ export default class Navigation extends Component {
   * @protected
   */
  getPaneButton() {
-    const {pane} = app;
+    const { pane } = app;

    if (!pane || !pane.active) return '';

    return Button.component({
      className: 'Button Button--icon Navigation-pin' + (pane.pinned ? ' active' : ''),
      onclick: pane.togglePinned.bind(pane),
-      icon: 'fas fa-thumbtack'
+      icon: 'fas fa-thumbtack',
    });
  }

@@ -88,19 +80,18 @@ export default class Navigation extends Component {
   * @protected
   */
  getDrawerButton() {
-    if (!this.props.drawer) return '';
+    if (!this.attrs.drawer) return '';

-    const {drawer} = app;
+    const { drawer } = app;
    const user = app.session.user;

    return Button.component({
-      className: 'Button Button--icon Navigation-drawer' +
-        (user && user.newNotificationCount() ? ' new' : ''),
-      onclick: e => {
+      className: 'Button Button--icon Navigation-drawer' + (user && user.newNotificationCount() ? ' new' : ''),
+      onclick: (e) => {
        e.stopPropagation();
        drawer.show();
      },
-      icon: 'fas fa-bars'
+      icon: 'fas fa-bars',
    });
  }
 }
--- a/js/src/common/components/Page.js
+++ b/js/src/common/components/Page.js
@@ -0,0 +1,66 @@
+import Component from '../Component';
+import PageState from '../states/PageState';
+
+/**
+ * The `Page` component
+ *
+ * @abstract
+ */
+export default class Page extends Component {
+  oninit(vnode) {
+    super.oninit(vnode);
+
+    this.onNewRoute();
+
+    /**
+     * A class name to apply to the body while the route is active.
+     *
+     * @type {String}
+     */
+    this.bodyClass = '';
+
+    this.currentPath = m.route.get();
+  }
+
+  routeHasChanged() {
+    return this.currentPath !== m.route.get();
+  }
+
+  /**
+   * A collections of actions to run when the route changes.
+   * This is extracted here, and not hardcoded in oninit, as oninit is not called
+   * when a different route is handled by the same component, but we still need to
+   * adjust the current route name.
+   */
+  onNewRoute() {
+    this.currentPath = m.route.get();
+
+    app.previous = app.current;
+    app.current = new PageState(this.constructor, { routeName: this.attrs.routeName });
+
+    app.drawer.hide();
+    app.modal.close();
+  }
+
+  onbeforeupdate(vnode, old) {
+    super.onbeforeupdate(vnode, old);
+
+    if (this.routeHasChanged()) {
+      this.onNewRoute();
+    }
+  }
+
+  oncreate(vnode) {
+    super.oncreate(vnode);
+
+    if (this.bodyClass) {
+      $('#app').addClass(this.bodyClass);
+    }
+  }
+
+  onremove() {
+    if (this.bodyClass) {
+      $('#app').removeClass(this.bodyClass);
+    }
+  }
+}
--- a/js/src/common/components/Placeholder.js
+++ b/js/src/common/components/Placeholder.js
@@ -4,7 +4,7 @@ import Component from '../Component';
 * The `Placeholder` component displays a muted text with some call to action,
 * usually used as an empty state.
 *
- * ### Props
+ * ### Attrs
 *
 * - `text`
 */
@@ -12,7 +12,7 @@ export default class Placeholder extends Component {
  view() {
    return (
      <div className="Placeholder">
-        <p>{this.props.text}</p>
+        <p>{this.attrs.text}</p>
      </div>
    );
  }
--- a/js/src/common/components/RequestErrorModal.js
+++ b/js/src/common/components/RequestErrorModal.js
@@ -6,25 +6,37 @@ export default class RequestErrorModal extends Modal {
  }

  title() {
-    return this.props.error.xhr
-      ? this.props.error.xhr.status+' '+this.props.error.xhr.statusText
-      : '';
+    return this.attrs.error.xhr ? `${this.attrs.error.xhr.status} ${this.attrs.error.xhr.statusText}` : '';
  }

  content() {
+    const { error, formattedError } = this.attrs;
+
    let responseText;

-    try {
-      responseText = JSON.stringify(JSON.parse(this.props.error.responseText), null, 2);
-    } catch (e) {
-      responseText = this.props.error.responseText;
+    // If the error is already formatted, just add line endings;
+    // else try to parse it as JSON and stringify it with indentation
+    if (formattedError) {
+      responseText = formattedError.join('\n\n');
+    } else {
+      try {
+        const json = error.response || JSON.parse(error.responseText);
+
+        responseText = JSON.stringify(json, null, 2);
+      } catch (e) {
+        responseText = error.responseText;
+      }
    }

-    return <div className="Modal-body">
-      <pre>
-        {this.props.error.options.method} {this.props.error.options.url}<br/><br/>
-        {responseText}
-      </pre>
-    </div>;
+    return (
+      <div className="Modal-body">
+        <pre>
+          {this.attrs.error.options.method} {this.attrs.error.options.url}
+          <br />
+          <br />
+          {responseText}
+        </pre>
+      </div>
+    );
  }
 }
--- a/js/src/common/components/Select.js
+++ b/js/src/common/components/Select.js
@@ -1,24 +1,33 @@
 import Component from '../Component';
 import icon from '../helpers/icon';
+import withAttr from '../utils/withAttr';

 /**
 * The `Select` component displays a <select> input, surrounded with some extra
- * elements for styling. It accepts the following props:
+ * elements for styling. It accepts the following attrs:
 *
 * - `options` A map of option values to labels.
 * - `onchange` A callback to run when the selected value is changed.
 * - `value` The value of the selected option.
+ * - `disabled` Disabled state for the input.
 */
 export default class Select extends Component {
  view() {
-    const {options, onchange, value} = this.props;
+    const { options, onchange, value, disabled } = this.attrs;

    return (
      <span className="Select">
-        <select className="Select-input FormControl" onchange={onchange ? m.withAttr('value', onchange.bind(this)) : undefined} value={value}>
-          {Object.keys(options).map(key => <option value={key}>{options[key]}</option>)}
+        <select
+          className="Select-input FormControl"
+          onchange={onchange ? withAttr('value', onchange.bind(this)) : undefined}
+          value={value}
+          disabled={disabled}
+        >
+          {Object.keys(options).map((key) => (
+            <option value={key}>{options[key]}</option>
+          ))}
        </select>
-        {icon('fas fa-sort', {className: 'Select-caret'})}
+        {icon('fas fa-sort', { className: 'Select-caret' })}
      </span>
    );
  }
--- a/js/src/common/components/SelectDropdown.js
+++ b/js/src/common/components/SelectDropdown.js
@@ -1,34 +1,49 @@
 import Dropdown from './Dropdown';
 import icon from '../helpers/icon';

+/**
+ * Determines via a vnode is currently "active".
+ * Due to changes in Mithril 2, attrs will not be instantiated until AFTER view()
+ * is initially called on the parent component, so we can not always depend on the
+ * active attr to determine which element should be displayed as the "active child".
+ *
+ * This is a temporary patch, and as so, is not exported / placed in utils.
+ */
+function isActive(vnode) {
+  const tag = vnode.tag;
+
+  if ('initAttrs' in tag) {
+    tag.initAttrs(vnode.attrs);
+  }
+
+  return 'isActive' in tag ? tag.isActive(vnode.attrs) : vnode.attrs.active;
+}
+
 /**
 * The `SelectDropdown` component is the same as a `Dropdown`, except the toggle
 * button's label is set as the label of the first child which has a truthy
 * `active` prop.
 *
- * ### Props
+ * ### Attrs
 *
 * - `caretIcon`
 * - `defaultLabel`
 */
 export default class SelectDropdown extends Dropdown {
-  static initProps(props) {
-    props.caretIcon = typeof props.caretIcon !== 'undefined' ? props.caretIcon : 'fas fa-sort';
+  static initAttrs(attrs) {
+    attrs.caretIcon = typeof attrs.caretIcon !== 'undefined' ? attrs.caretIcon : 'fas fa-sort';

-    super.initProps(props);
+    super.initAttrs(attrs);

-    props.className += ' Dropdown--select';
+    attrs.className += ' Dropdown--select';
  }

-  getButtonContent() {
-    const activeChild = this.props.children.filter(child => child.props.active)[0];
-    let label = activeChild && activeChild.props.children || this.props.defaultLabel;
+  getButtonContent(children) {
+    const activeChild = children.find(isActive);
+    let label = (activeChild && activeChild.children) || this.attrs.defaultLabel;

    if (label instanceof Array) label = label[0];

-    return [
-      <span className="Button-label">{label}</span>,
-      icon(this.props.caretIcon, {className: 'Button-caret'})
-    ];
+    return [<span className="Button-label">{label}</span>, icon(this.attrs.caretIcon, { className: 'Button-caret' })];
  }
 }
--- a/js/src/common/components/Separator.js
+++ b/js/src/common/components/Separator.js
@@ -5,7 +5,7 @@ import Component from '../Component';
 */
 class Separator extends Component {
  view() {
-    return <li className="Dropdown-separator"/>;
+    return <li className="Dropdown-separator" />;
  }
 }

--- a/js/src/common/components/SplitDropdown.js
+++ b/js/src/common/components/SplitDropdown.js
@@ -7,29 +7,27 @@ import icon from '../helpers/icon';
 * is displayed as its own button prior to the toggle button.
 */
 export default class SplitDropdown extends Dropdown {
-  static initProps(props) {
-    super.initProps(props);
+  static initAttrs(attrs) {
+    super.initAttrs(attrs);

-    props.className += ' Dropdown--split';
-    props.menuClassName += ' Dropdown-menu--right';
+    attrs.className += ' Dropdown--split';
+    attrs.menuClassName += ' Dropdown-menu--right';
  }

-  getButton() {
-    // Make a copy of the props of the first child component. We will assign
-    // these props to a new button, so that it has exactly the same behaviour as
+  getButton(children) {
+    // Make a copy of the attrs of the first child component. We will assign
+    // these attrs to a new button, so that it has exactly the same behaviour as
    // the first child.
-    const firstChild = this.getFirstChild();
-    const buttonProps = Object.assign({}, firstChild.props);
-    buttonProps.className = (buttonProps.className || '') + ' SplitDropdown-button Button ' + this.props.buttonClassName;
+    const firstChild = this.getFirstChild(children);
+    const buttonAttrs = Object.assign({}, firstChild.attrs);
+    buttonAttrs.className = (buttonAttrs.className || '') + ' SplitDropdown-button Button ' + this.attrs.buttonClassName;

    return [
-      Button.component(buttonProps),
-      <button
-        className={'Dropdown-toggle Button Button--icon ' + this.props.buttonClassName}
-        data-toggle="dropdown">
-        {icon(this.props.icon, {className: 'Button-icon'})}
-        {icon('fas fa-caret-down', {className: 'Button-caret'})}
-      </button>
+      Button.component(buttonAttrs, firstChild.children),
+      <button className={'Dropdown-toggle Button Button--icon ' + this.attrs.buttonClassName} data-toggle="dropdown">
+        {icon(this.attrs.icon, { className: 'Button-icon' })}
+        {icon('fas fa-caret-down', { className: 'Button-caret' })}
+      </button>,
    ];
  }

@@ -40,8 +38,8 @@ export default class SplitDropdown extends Dropdown {
   * @return {*}
   * @protected
   */
-  getFirstChild() {
-    let firstChild = this.props.children;
+  getFirstChild(children) {
+    let firstChild = children;

    while (firstChild instanceof Array) firstChild = firstChild[0];

--- a/js/src/common/components/Switch.js
+++ b/js/src/common/components/Switch.js
@@ -5,13 +5,13 @@ import Checkbox from './Checkbox';
 * a tick/cross one.
 */
 export default class Switch extends Checkbox {
-  static initProps(props) {
-    super.initProps(props);
+  static initAttrs(attrs) {
+    super.initAttrs(attrs);

-    props.className = (props.className || '') + ' Checkbox--switch';
+    attrs.className = (attrs.className || '') + ' Checkbox--switch';
  }

  getDisplay() {
-    return this.loading ? super.getDisplay() : '';
+    return this.attrs.loading ? super.getDisplay() : '';
  }
 }
--- a/js/src/common/extend.js
+++ b/js/src/common/extend.js
@@ -21,7 +21,7 @@
 export function extend(object, method, callback) {
  const original = object[method];

-  object[method] = function(...args) {
+  object[method] = function (...args) {
    const value = original ? original.apply(this, args) : undefined;

    callback.apply(this, [value].concat(args));
@@ -57,7 +57,7 @@ export function extend(object, method, callback) {
 export function override(object, method, newMethod) {
  const original = object[method];

-  object[method] = function(...args) {
+  object[method] = function (...args) {
    return newMethod.apply(this, [original.bind(this)].concat(args));
  };

--- a/js/src/common/extend/Model.js
+++ b/js/src/common/extend/Model.js
@@ -1,4 +1,4 @@
-export default class Routes {
+export default class Model {
  type;
  attributes = [];
  hasOnes = [];
@@ -31,11 +31,11 @@ export default class Routes {
    if (this.model) {
      app.store.models[this.type] = this.model;
    }
-    
+
    const model = app.store.models[this.type];

-    this.attributes.forEach(name => model.prototype[name] = model.attribute(name));
-    this.hasOnes.forEach(name => model.prototype[name] = model.hasOne(name));
-    this.hasManys.forEach(name => model.prototype[name] = model.hasMany(name));
+    this.attributes.forEach((name) => (model.prototype[name] = model.attribute(name)));
+    this.hasOnes.forEach((name) => (model.prototype[name] = model.hasOne(name)));
+    this.hasManys.forEach((name) => (model.prototype[name] = model.hasMany(name)));
  }
-}
+}
--- a/js/src/common/extend/PostTypes.js
+++ b/js/src/common/extend/PostTypes.js
@@ -10,4 +10,4 @@ export default class PostTypes {
  extend(app, extension) {
    Object.assign(app.postComponents, this.postComponents);
  }
-}
+}
--- a/js/src/common/extend/Routes.js
+++ b/js/src/common/extend/Routes.js
@@ -10,4 +10,4 @@ export default class Routes {
  extend(app, extension) {
    Object.assign(app.routes, this.routes);
  }
-}
+}
--- a/js/src/common/helpers/avatar.js
+++ b/js/src/common/helpers/avatar.js
@@ -25,11 +25,11 @@ export default function avatar(user, attrs = {}) {
    if (hasTitle) attrs.title = attrs.title || username;

    if (avatarUrl) {
-      return <img {...attrs} src={avatarUrl}/>;
+      return <img {...attrs} src={avatarUrl} alt="" />;
    }

    content = username.charAt(0).toUpperCase();
-    attrs.style = {background: user.color()};
+    attrs.style = { background: user.color() };
  }

  return <span {...attrs}>{content}</span>;
--- a/js/src/common/helpers/fullTime.js
+++ b/js/src/common/helpers/fullTime.js
@@ -6,10 +6,14 @@
 * @return {Object}
 */
 export default function fullTime(time) {
-  const mo = moment(time);
+  const d = dayjs(time);

-  const datetime = mo.format();
-  const full = mo.format('LLLL');
+  const datetime = d.format();
+  const full = d.format('LLLL');

-  return <time pubdate datetime={datetime}>{full}</time>;
+  return (
+    <time pubdate datetime={datetime}>
+      {full}
+    </time>
+  );
 }
--- a/js/src/common/helpers/humanTime.js
+++ b/js/src/common/helpers/humanTime.js
@@ -9,11 +9,15 @@ import humanTimeUtil from '../utils/humanTime';
 * @return {Object}
 */
 export default function humanTime(time) {
-  const mo = moment(time);
+  const d = dayjs(time);

-  const datetime = mo.format();
-  const full = mo.format('LLLL');
+  const datetime = d.format();
+  const full = d.format('LLLL');
  const ago = humanTimeUtil(time);

-  return <time pubdate datetime={datetime} title={full} data-humantime>{ago}</time>;
+  return (
+    <time pubdate datetime={datetime} title={full} data-humantime>
+      {ago}
+    </time>
+  );
 }
--- a/js/src/common/helpers/icon.js
+++ b/js/src/common/helpers/icon.js
@@ -8,5 +8,5 @@
 export default function icon(fontClass, attrs = {}) {
  attrs.className = 'icon ' + fontClass + ' ' + (attrs.className || '');

-  return <i {...attrs}/>;
+  return <i {...attrs} />;
 }
--- a/js/src/common/helpers/listItems.js
+++ b/js/src/common/helpers/listItems.js
@@ -2,14 +2,14 @@ import Separator from '../components/Separator';
 import classList from '../utils/classList';

 function isSeparator(item) {
-  return item && item.component === Separator;
+  return item.tag === Separator;
 }

 function withoutUnnecessarySeparators(items) {
  const newItems = [];
  let prevItem;

-  items.forEach((item, i) => {
+  items.filter(Boolean).forEach((item, i) => {
    if (!isSeparator(item) || (prevItem && !isSeparator(prevItem) && i !== items.length - 1)) {
      prevItem = item;
      newItems.push(item);
@@ -29,25 +29,28 @@ function withoutUnnecessarySeparators(items) {
 export default function listItems(items) {
  if (!(items instanceof Array)) items = [items];

-  return withoutUnnecessarySeparators(items).map(item => {
-    const isListItem = item.component && item.component.isListItem;
-    const active = item.component && item.component.isActive && item.component.isActive(item.props);
-    const className = item.props ? item.props.itemClassName : item.itemClassName;
+  return withoutUnnecessarySeparators(items).map((item) => {
+    const isListItem = item.tag && item.tag.isListItem;
+    const active = item.tag && item.tag.isActive && item.tag.isActive(item.attrs);
+    const className = (item.attrs && item.attrs.itemClassName) || item.itemClassName;

    if (isListItem) {
      item.attrs = item.attrs || {};
      item.attrs.key = item.attrs.key || item.itemName;
+      item.key = item.attrs.key;
    }

-    return isListItem
-      ? item
-      : <li className={classList([
-          (item.itemName ? 'item-' + item.itemName : ''),
-          className,
-          (active ? 'active' : '')
-        ])}
-          key={item.itemName}>
-          {item}
-        </li>;
+    const node = isListItem ? (
+      item
+    ) : (
+      <li
+        className={classList([className, item.itemName && `item-${item.itemName}`, active && 'active'])}
+        key={(item.attrs && item.attrs.key) || item.itemName}
+      >
+        {item}
+      </li>
+    );
+
+    return node;
  });
 }
--- a/js/src/common/helpers/punctuateSeries.js
+++ b/js/src/common/helpers/punctuateSeries.js
@@ -13,7 +13,7 @@ export default function punctuateSeries(items) {
  if (items.length === 2) {
    return app.translator.trans('core.lib.series.two_text', {
      first: items[0],
-      second: items[1]
+      second: items[1],
    });
  } else if (items.length >= 3) {
    // If there are three or more items, we will join all but the first and
@@ -27,7 +27,7 @@ export default function punctuateSeries(items) {
    return app.translator.trans('core.lib.series.three_text', {
      first: items[0],
      second,
-      third: items[items.length - 1]
+      third: items[items.length - 1],
    });
  }

--- a/js/src/common/helpers/userOnline.js
+++ b/js/src/common/helpers/userOnline.js
@@ -7,7 +7,7 @@ import icon from './icon';
 * @return {Object}
 */
 export default function userOnline(user) {
-    if (user.lastSeenAt() && user.isOnline()) {
-        return <span className="UserOnline">{icon('fas fa-circle')}</span>;
-    }
+  if (user.lastSeenAt() && user.isOnline()) {
+    return <span className="UserOnline">{icon('fas fa-circle')}</span>;
+  }
 }
--- a/js/src/common/index.js
+++ b/js/src/common/index.js
@@ -1,6 +1,6 @@
 import 'expose-loader?$!expose-loader?jQuery!jquery';
 import 'expose-loader?m!mithril';
-import 'expose-loader?moment!moment';
+import 'expose-loader?moment!expose-loader?dayjs!dayjs';
 import 'expose-loader?m.bidi!m.attrs.bidi';
 import 'bootstrap/js/affix';
 import 'bootstrap/js/dropdown';
@@ -9,6 +9,12 @@ import 'bootstrap/js/tooltip';
 import 'bootstrap/js/transition';
 import 'jquery.hotkeys/jquery.hotkeys';

+import relativeTime from 'dayjs/plugin/relativeTime';
+import localizedFormat from 'dayjs/plugin/localizedFormat';
+
+dayjs.extend(relativeTime);
+dayjs.extend(localizedFormat);
+
 import patchMithril from './utils/patchMithril';

 patchMithril(window);
--- a/js/src/common/models/Discussion.js
+++ b/js/src/common/models/Discussion.js
@@ -19,18 +19,18 @@ Object.assign(Discussion.prototype, {
  lastPostNumber: Model.attribute('lastPostNumber'),

  commentCount: Model.attribute('commentCount'),
-  replyCount: computed('commentCount', commentCount => Math.max(0, commentCount - 1)),
+  replyCount: computed('commentCount', (commentCount) => Math.max(0, commentCount - 1)),
  posts: Model.hasMany('posts'),
  mostRelevantPost: Model.hasOne('mostRelevantPost'),

  lastReadAt: Model.attribute('lastReadAt', Model.transformDate),
  lastReadPostNumber: Model.attribute('lastReadPostNumber'),
-  isUnread: computed('unreadCount', unreadCount => !!unreadCount),
-  isRead: computed('unreadCount', unreadCount => app.session.user && !unreadCount),
+  isUnread: computed('unreadCount', (unreadCount) => !!unreadCount),
+  isRead: computed('unreadCount', (unreadCount) => app.session.user && !unreadCount),

  hiddenAt: Model.attribute('hiddenAt', Model.transformDate),
  hiddenUser: Model.hasOne('hiddenUser'),
-  isHidden: computed('hiddenAt', hiddenAt => !!hiddenAt),
+  isHidden: computed('hiddenAt', (hiddenAt) => !!hiddenAt),

  canReply: Model.attribute('canReply'),
  canRename: Model.attribute('canRename'),
@@ -68,7 +68,10 @@ Object.assign(Discussion.prototype, {
    const user = app.session.user;

    if (user && user.markedAllAsReadAt() < this.lastPostedAt()) {
-      return Math.max(0, this.lastPostNumber() - (this.lastReadPostNumber() || 0));
+      const unreadCount = Math.max(0, this.lastPostNumber() - (this.lastReadPostNumber() || 0));
+      // If posts have been deleted, it's possible that the unread count could exceed the
+      // actual post count. As such, we take the min of the two to ensure this isn't an issue.
+      return Math.min(unreadCount, this.commentCount());
    }

    return 0;
@@ -84,7 +87,7 @@ Object.assign(Discussion.prototype, {
    const items = new ItemList();

    if (this.isHidden()) {
-      items.add('hidden', <Badge type="hidden" icon="fas fa-trash" label={app.translator.trans('core.lib.badge.hidden_tooltip')}/>);
+      items.add('hidden', <Badge type="hidden" icon="fas fa-trash" label={app.translator.trans('core.lib.badge.hidden_tooltip')} />);
    }

    return items;
@@ -99,6 +102,6 @@ Object.assign(Discussion.prototype, {
  postIds() {
    const posts = this.data.relationships.posts;

-    return posts ? posts.data.map(link => link.id) : [];
-  }
+    return posts ? posts.data.map((link) => link.id) : [];
+  },
 });
--- a/js/src/common/models/Group.js
+++ b/js/src/common/models/Group.js
@@ -6,7 +6,8 @@ Object.assign(Group.prototype, {
  nameSingular: Model.attribute('nameSingular'),
  namePlural: Model.attribute('namePlural'),
  color: Model.attribute('color'),
-  icon: Model.attribute('icon')
+  icon: Model.attribute('icon'),
+  isHidden: Model.attribute('isHidden'),
 });

 Group.ADMINISTRATOR_ID = '1';
--- a/js/src/common/models/Notification.js
+++ b/js/src/common/models/Notification.js
@@ -11,5 +11,5 @@ Object.assign(Notification.prototype, {

  user: Model.hasOne('user'),
  fromUser: Model.hasOne('fromUser'),
-  subject: Model.hasOne('subject')
+  subject: Model.hasOne('subject'),
 });
--- a/js/src/common/models/Post.js
+++ b/js/src/common/models/Post.js
@@ -17,13 +17,13 @@ Object.assign(Post.prototype, {

  editedAt: Model.attribute('editedAt', Model.transformDate),
  editedUser: Model.hasOne('editedUser'),
-  isEdited: computed('editedAt', editedAt => !!editedAt),
+  isEdited: computed('editedAt', (editedAt) => !!editedAt),

  hiddenAt: Model.attribute('hiddenAt', Model.transformDate),
  hiddenUser: Model.hasOne('hiddenUser'),
-  isHidden: computed('hiddenAt', hiddenAt => !!hiddenAt),
+  isHidden: computed('hiddenAt', (hiddenAt) => !!hiddenAt),

  canEdit: Model.attribute('canEdit'),
  canHide: Model.attribute('canHide'),
-  canDelete: Model.attribute('canDelete')
+  canDelete: Model.attribute('canDelete'),
 });
--- a/js/src/common/models/User.js
+++ b/js/src/common/models/User.js
@@ -32,7 +32,7 @@ Object.assign(User.prototype, {
  canDelete: Model.attribute('canDelete'),

  avatarColor: null,
-  color: computed('username', 'avatarUrl', 'avatarColor', function(username, avatarUrl, avatarColor) {
+  color: computed('username', 'avatarUrl', 'avatarColor', function (username, avatarUrl, avatarColor) {
    // If we've already calculated and cached the dominant color of the user's
    // avatar, then we can return that in RGB format. If we haven't, we'll want
    // to calculate it. Unless the user doesn't have an avatar, in which case
@@ -54,7 +54,7 @@ Object.assign(User.prototype, {
   * @public
   */
  isOnline() {
-    return this.lastSeenAt() > moment().subtract(5, 'minutes').toDate();
+    return dayjs().subtract(5, 'minutes').isBefore(this.lastSeenAt());
  },

  /**
@@ -67,8 +67,8 @@ Object.assign(User.prototype, {
    const groups = this.groups();

    if (groups) {
-      groups.forEach(group => {
-        items.add('group' + group.id(), GroupBadge.component({group}));
+      groups.forEach((group) => {
+        items.add('group' + group.id(), GroupBadge.component({ group }));
      });
    }

@@ -85,7 +85,7 @@ Object.assign(User.prototype, {
    const image = new Image();
    const user = this;

-    image.onload = function() {
+    image.onload = function () {
      const colorThief = new ColorThief();
      user.avatarColor = colorThief.getColor(this);
      user.freshness = new Date();
@@ -106,6 +106,6 @@ Object.assign(User.prototype, {

    Object.assign(preferences, newPreferences);

-    return this.save({preferences});
-  }
+    return this.save({ preferences });
+  },
 });
--- a/js/src/common/states/AlertManagerState.ts
+++ b/js/src/common/states/AlertManagerState.ts
@@ -0,0 +1,80 @@
+import Mithril from 'mithril';
+import Alert, { AlertAttrs } from '../components/Alert';
+
+/**
+ * Returned by `AlertManagerState.show`. Used to dismiss alerts.
+ */
+export type AlertIdentifier = number;
+
+export interface AlertState {
+  componentClass: typeof Alert;
+  attrs: AlertAttrs;
+  children: Mithril.Children;
+}
+
+export default class AlertManagerState {
+  protected activeAlerts: { [id: number]: AlertState } = {};
+  protected alertId = 0;
+
+  getActiveAlerts() {
+    return this.activeAlerts;
+  }
+
+  /**
+   * Show an Alert in the alerts area.
+   *
+   * @returns The alert's ID, which can be used to dismiss the alert.
+   */
+  show(children: Mithril.Children): AlertIdentifier;
+  show(attrs: AlertAttrs, children: Mithril.Children): AlertIdentifier;
+  show(componentClass: Alert, attrs: AlertAttrs, children: Mithril.Children): AlertIdentifier;
+
+  show(arg1: any, arg2?: any, arg3?: any) {
+    // Assigns variables as per the above signatures
+    let componentClass = Alert;
+    let attrs: AlertAttrs = {};
+    let children: Mithril.Children;
+
+    if (arguments.length == 1) {
+      children = arg1 as Mithril.Children;
+    } else if (arguments.length == 2) {
+      attrs = arg1 as AlertAttrs;
+      children = arg2 as Mithril.Children;
+    } else if (arguments.length == 3) {
+      componentClass = arg1 as typeof Alert;
+      attrs = arg2 as AlertAttrs;
+      children = arg3;
+    }
+
+    // Breaking Change Compliance Warning, Remove in Beta 15.
+    // This is applied to the first argument (attrs) because previously, the alert was passed as the first argument.
+    if (attrs === Alert || attrs instanceof Alert) {
+      // This is duplicated so that if the error is caught, an error message still shows up in the debug console.
+      console.error('The AlertManager can only show Alerts. Whichever extension triggered this alert should be updated to comply with beta 14.');
+      throw new Error('The AlertManager can only show Alerts. Whichever extension triggered this alert should be updated to comply with beta 14.');
+    }
+    // End Change Compliance Warning, Remove in Beta 15
+    this.activeAlerts[++this.alertId] = { children, attrs, componentClass };
+    m.redraw();
+
+    return this.alertId;
+  }
+
+  /**
+   * Dismiss an alert.
+   */
+  dismiss(key: AlertIdentifier): void {
+    if (!key || !(key in this.activeAlerts)) return;
+
+    delete this.activeAlerts[key];
+    m.redraw();
+  }
+
+  /**
+   * Clear all alerts.
+   */
+  clear(): void {
+    this.activeAlerts = {};
+    m.redraw();
+  }
+}
--- a/js/src/common/states/ModalManagerState.js
+++ b/js/src/common/states/ModalManagerState.js
@@ -0,0 +1,56 @@
+import Modal from '../components/Modal';
+
+export default class ModalManagerState {
+  constructor() {
+    this.modal = null;
+  }
+
+  /**
+   * Show a modal dialog.
+   *
+   * @public
+   */
+  show(componentClass, attrs) {
+    // Breaking Change Compliance Warning, Remove in Beta 15.
+    if (!(componentClass.prototype instanceof Modal)) {
+      // This is duplicated so that if the error is caught, an error message still shows up in the debug console.
+      console.error('The ModalManager can only show Modals');
+      throw new Error('The ModalManager can only show Modals');
+    }
+    if (componentClass.init) {
+      // This is duplicated so that if the error is caught, an error message still shows up in the debug console.
+      console.error(
+        'The componentClass parameter must be a modal class, not a modal instance. Whichever extension triggered this modal should be updated to comply with beta 14.'
+      );
+      throw new Error(
+        'The componentClass parameter must be a modal class, not a modal instance. Whichever extension triggered this modal should be updated to comply with beta 14.'
+      );
+    }
+    // End Change Compliance Warning, Remove in Beta 15
+
+    clearTimeout(this.closeTimeout);
+
+    this.modal = { componentClass, attrs };
+
+    m.redraw.sync();
+  }
+
+  /**
+   * Close the modal dialog.
+   *
+   * @public
+   */
+  close() {
+    if (!this.modal) return;
+
+    // Don't hide the modal immediately, because if the consumer happens to call
+    // the `show` method straight after to show another modal dialog, it will
+    // cause Bootstrap's modal JS to misbehave. Instead we will wait for a tiny
+    // bit to give the `show` method the opportunity to prevent this from going
+    // ahead.
+    this.closeTimeout = setTimeout(() => {
+      this.modal = null;
+      m.redraw();
+    });
+  }
+}
--- a/js/src/common/states/PageState.js
+++ b/js/src/common/states/PageState.js
@@ -0,0 +1,33 @@
+import subclassOf from '../../common/utils/subclassOf';
+
+export default class PageState {
+  constructor(type, data = {}) {
+    this.type = type;
+    this.data = data;
+  }
+
+  /**
+   * Determine whether the page matches the given class and data.
+   *
+   * @param {object} type The page class to check against. Subclasses are
+   *                      accepted as well.
+   * @param {object} data
+   * @return {boolean}
+   */
+  matches(type, data = {}) {
+    // Fail early when the page is of a different type
+    if (!subclassOf(this.type, type)) return false;
+
+    // Now that the type is known to be correct, we loop through the provided
+    // data to see whether it matches the data in our state.
+    return Object.keys(data).every((key) => this.data[key] === data[key]);
+  }
+
+  get(key) {
+    return this.data[key];
+  }
+
+  set(key, value) {
+    this.data[key] = value;
+  }
+}
--- a/js/src/common/utils/Drawer.js
+++ b/js/src/common/utils/Drawer.js
@@ -7,7 +7,7 @@ export default class Drawer {
  constructor() {
    // Set up an event handler so that whenever the content area is tapped,
    // the drawer will close.
-    $('#content').click(e => {
+    $('#content').click((e) => {
      if (this.isOpen()) {
        e.preventDefault();
        this.hide();
--- a/js/src/common/utils/ItemList.ts
+++ b/js/src/common/utils/ItemList.ts
@@ -1,5 +1,9 @@
 class Item {
-  constructor(content, priority) {
+  content: any;
+  priority: number;
+  key?: number;
+
+  constructor(content: any, priority?: number) {
    this.content = content;
    this.priority = priority;
  }
@@ -10,25 +14,17 @@ class Item {
 * by priority.
 */
 export default class ItemList {
-  constructor() {
-    /**
-     * The items in the list.
-     *
-     * @type {Object}
-     * @public
-     */
-    this.items = {};
-  }
+  /**
+   * The items in the list
+   */
+  items: { [key: string]: Item } = {};

  /**
   * Check whether the list is empty.
-   *
-   * @returns {boolean}
-   * @public
   */
-  isEmpty() {
+  isEmpty(): boolean {
    for (const i in this.items) {
-      if(this.items.hasOwnProperty(i)) {
+      if (this.items.hasOwnProperty(i)) {
        return false;
      }
    }
@@ -38,36 +34,27 @@ export default class ItemList {

  /**
   * Check whether an item is present in the list.
-   *
-   * @param key
-   * @returns {boolean}
   */
-  has(key) {
+  has(key: string): boolean {
    return !!this.items[key];
  }

  /**
   * Get the content of an item.
-   *
-   * @param {String} key
-   * @return {*}
-   * @public
   */
-  get(key) {
+  get(key: string): any {
    return this.items[key].content;
  }

  /**
   * Add an item to the list.
   *
-   * @param {String} key A unique key for the item.
-   * @param {*} content The item's content.
-   * @param {Integer} [priority] The priority of the item. Items with a higher
+   * @param key A unique key for the item.
+   * @param content The item's content.
+   * @param [priority] The priority of the item. Items with a higher
   *     priority will be positioned before items with a lower priority.
-   * @return {ItemList}
-   * @public
   */
-  add(key, content, priority = 0) {
+  add(key: string, content: any, priority: number = 0): this {
    this.items[key] = new Item(content, priority);

    return this;
@@ -75,14 +62,8 @@ export default class ItemList {

  /**
   * Replace an item in the list, only if it is already present.
-   *
-   * @param {String} key
-   * @param {*} [content]
-   * @param {Integer} [priority]
-   * @return {ItemList}
-   * @public
   */
-  replace(key, content = null, priority = null) {
+  replace(key: string, content: any = null, priority: number = null): this {
    if (this.items[key]) {
      if (content !== null) {
        this.items[key].content = content;
@@ -98,12 +79,8 @@ export default class ItemList {

  /**
   * Remove an item from the list.
-   *
-   * @param {String} key
-   * @return {ItemList}
-   * @public
   */
-  remove(key) {
+  remove(key: string): this {
    delete this.items[key];

    return this;
@@ -111,12 +88,8 @@ export default class ItemList {

  /**
   * Merge another list's items into this one.
-   *
-   * @param {ItemList} items
-   * @return {ItemList}
-   * @public
   */
-  merge(items) {
+  merge(items: this): this {
    for (const i in items.items) {
      if (items.items.hasOwnProperty(i) && items.items[i] instanceof Item) {
        this.items[i] = items.items[i];
@@ -130,12 +103,9 @@ export default class ItemList {
   * Convert the list into an array of item content arranged by priority. Each
   * item's content will be assigned an `itemName` property equal to the item's
   * unique key.
-   *
-   * @return {Array}
-   * @public
   */
-  toArray() {
-    const items = [];
+  toArray(): any[] {
+    const items: Item[] = [];

    for (const i in this.items) {
      if (this.items.hasOwnProperty(i) && this.items[i] instanceof Item) {
@@ -147,14 +117,15 @@ export default class ItemList {
      }
    }

-    return items.sort((a, b) => {
-      if (a.priority === b.priority) {
-        return a.key - b.key;
-      } else if (a.priority > b.priority) {
-        return -1;
-      }
-      return 1;
-    }).map(item => item.content);
+    return items
+      .sort((a, b) => {
+        if (a.priority === b.priority) {
+          return a.key - b.key;
+        } else if (a.priority > b.priority) {
+          return -1;
+        }
+        return 1;
+      })
+      .map((item) => item.content);
  }
 }
-
--- a/Show More
+++ b/Show More