feat: Code Splitting (#3860)

* feat: configure webpack to allow splitting chunks
* feat: `JsDirectoryCompiler` and expose js assets URL
* chore: support es2020 dynamic importing
* feat: control which URL to fetch chunks from
* feat: allow showing async modals & split 'LogInModal'
* feat: split `SignUpModal`
* feat: allow rendering async pages & split `UserSecurityPage`
* fix: module might not be listed in chunk
* feat: lazy load user pages
* feat: track the chunk containing each module
* chore: lightly warn
* chore: split `Composer`
* feat: add common frontend (for split common chunks)
* fix: jsDoc typing imports should be ignored
* feat: split `PostStream` `ForgotPasswordModal` and `EditUserModal`
* fix: multiple inline async imports not picked up
* chore: new `common` frontend assets only needs a jsdir compiler
* feat: add revision hash to chunk import URL
* fix: nothing to split for `admin` frontend yet
* chore: cleanup registry API
* chore: throw an error in debug mode if attempting to import a non-loaded module
* feat: defer `extend` & `override` until after module registration
* fix: plugin not picking up on all module sources
* fix: must override default chunk loader function from webpack plugin
* feat: split tags `TagDiscussionModal` and `TagSelectionModal`
* fix: wrong export name
* feat: import chunked modules from external packages
* feat: extensions compatibility
* feat: Router frontend extender async component
* chore: clean JS output path (removes stale chunks)
* fix: common chunks also need flushing
* chore: flush backend stale chunks
* Apply fixes from StyleCI
* feat: loading alert when async page component is loading
* chore: `yarn format`
* chore: typings
* chore: remove exception
* Apply fixes from StyleCI
* chore(infra): bundlewatch
* chore(infra): bundlewatch split chunks
* feat: split text editor
* chore: tag typings
* chore: bundlewatch
* fix: windows paths
* fix: wrong planned ext import format

framework/core/views/frontend/app.blade.php

@@ -16,11 +16,13 @@
 
         <script>
             document.getElementById('flarum-loading').style.display = 'block';
-            var flarum = {extensions: {}};
+            var flarum = {extensions: {}, debug: @js($debug)};
         </script>
 
         {!! $js !!}
 
+        <script id="flarum-rev-manifest" type="application/json">@json($revisions)</script>
+
         <script id="flarum-json-payload" type="application/json">@json($payload)</script>
 
         <script>