diff --git a/docs/walkthroughs/04-applying-custom-formatting.md b/docs/walkthroughs/04-applying-custom-formatting.md
index 5fea3c7c2..df89f965a 100644
--- a/docs/walkthroughs/04-applying-custom-formatting.md
+++ b/docs/walkthroughs/04-applying-custom-formatting.md
@@ -90,7 +90,9 @@ const App = () => {
               Transforms.setNodes(
                 editor,
                 { type: match ? 'paragraph' : 'code' },
-                { match: n => Element.isElement(n) && Editor.isBlock(editor, n) }
+                {
+                  match: n => Element.isElement(n) && Editor.isBlock(editor, n),
+                }
               )
               break
             }
@@ -178,7 +180,9 @@ const App = () => {
               Transforms.setNodes(
                 editor,
                 { type: match ? null : 'code' },
-                { match: n => Element.isElement(n) && Editor.isBlock(editor, n) }
+                {
+                  match: n => Element.isElement(n) && Editor.isBlock(editor, n),
+                }
               )
               break
             }
diff --git a/package.json b/package.json
index 65ade27ec..291463871 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,8 @@
     "@emotion/css": "^11.11.2",
     "@faker-js/faker": "^8.2.0",
     "@playwright/test": "^1.39.0",
+    "@types/is-hotkey": "^0.1.10",
+    "@types/is-url": "^1.2.32",
     "@types/jest": "29.5.6",
     "@types/lodash": "^4.14.200",
     "@types/mocha": "^10.0.3",
diff --git a/site/examples/js/check-lists.jsx b/site/examples/js/check-lists.jsx
index 6e56ed77d..36084fc80 100644
--- a/site/examples/js/check-lists.jsx
+++ b/site/examples/js/check-lists.jsx
@@ -121,9 +121,9 @@ const Element = props => {
   }
 }
 const CheckListItemElement = ({ attributes, children, element }) => {
+  const { checked } = element
   const editor = useSlateStatic()
   const readOnly = useReadOnly()
-  const { checked } = element
   return (
     <div
       {...attributes}
diff --git a/site/examples/js/code-highlighting.jsx b/site/examples/js/code-highlighting.jsx
index 371f51f60..c56c0cc3d 100644
--- a/site/examples/js/code-highlighting.jsx
+++ b/site/examples/js/code-highlighting.jsx
@@ -1,28 +1,28 @@
+import { css } from '@emotion/css'
+import isHotkey from 'is-hotkey'
 import Prism from 'prismjs'
+import 'prismjs/components/prism-java'
 import 'prismjs/components/prism-javascript'
 import 'prismjs/components/prism-jsx'
-import 'prismjs/components/prism-typescript'
-import 'prismjs/components/prism-tsx'
 import 'prismjs/components/prism-markdown'
-import 'prismjs/components/prism-python'
 import 'prismjs/components/prism-php'
+import 'prismjs/components/prism-python'
 import 'prismjs/components/prism-sql'
-import 'prismjs/components/prism-java'
+import 'prismjs/components/prism-tsx'
+import 'prismjs/components/prism-typescript'
 import React, { useCallback, useState } from 'react'
-import { createEditor, Node, Editor, Element, Transforms } from 'slate'
-import {
-  withReact,
-  Slate,
-  Editable,
-  useSlate,
-  ReactEditor,
-  useSlateStatic,
-} from 'slate-react'
+import { Editor, Element, Node, Transforms, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
-import isHotkey from 'is-hotkey'
-import { css } from '@emotion/css'
-import { normalizeTokens } from './utils/normalize-tokens'
+import {
+  Editable,
+  ReactEditor,
+  Slate,
+  useSlate,
+  useSlateStatic,
+  withReact,
+} from 'slate-react'
 import { Button, Icon, Toolbar } from './components'
+import { normalizeTokens } from './utils/normalize-tokens'
 
 const ParagraphType = 'paragraph'
 const CodeBlockType = 'code-block'
@@ -139,7 +139,7 @@ const useDecorate = editor => {
   return useCallback(
     ([node, path]) => {
       if (Element.isElement(node) && node.type === CodeLineType) {
-        const ranges = editor.nodeToDecorations.get(node) || []
+        const ranges = editor.nodeToDecorations?.get(node) || []
         return ranges
       }
       return []
diff --git a/site/examples/js/components/index.jsx b/site/examples/js/components/index.jsx
index 072558217..bb6c725ec 100644
--- a/site/examples/js/components/index.jsx
+++ b/site/examples/js/components/index.jsx
@@ -1,6 +1,6 @@
+import { css, cx } from '@emotion/css'
 import React from 'react'
 import ReactDOM from 'react-dom'
-import { cx, css } from '@emotion/css'
 
 export const Button = React.forwardRef(
   ({ className, active, reversed, ...props }, ref) => (
@@ -23,51 +23,6 @@ export const Button = React.forwardRef(
     />
   )
 )
-export const EditorValue = React.forwardRef(
-  ({ className, value, ...props }, ref) => {
-    const textLines = value.document.nodes
-      .map(node => node.text)
-      .toArray()
-      .join('\n')
-    return (
-      <div
-        ref={ref}
-        {...props}
-        className={cx(
-          className,
-          css`
-            margin: 30px -20px 0;
-          `
-        )}
-      >
-        <div
-          className={css`
-            font-size: 14px;
-            padding: 5px 20px;
-            color: #404040;
-            border-top: 2px solid #eeeeee;
-            background: #f8f8f8;
-          `}
-        >
-          Slate's value as text
-        </div>
-        <div
-          className={css`
-            color: #404040;
-            font: 12px monospace;
-            white-space: pre-wrap;
-            padding: 10px 20px;
-            div {
-              margin: 0 0 0.5em;
-            }
-          `}
-        >
-          {textLines}
-        </div>
-      </div>
-    )
-  }
-)
 export const Icon = React.forwardRef(({ className, ...props }, ref) => (
   <span
     {...props}
diff --git a/site/examples/js/custom-placeholder.jsx b/site/examples/js/custom-placeholder.jsx
index 1d192a61e..58332a5f6 100644
--- a/site/examples/js/custom-placeholder.jsx
+++ b/site/examples/js/custom-placeholder.jsx
@@ -1,7 +1,7 @@
 import React, { useMemo } from 'react'
 import { createEditor } from 'slate'
-import { Slate, Editable, withReact } from 'slate-react'
 import { withHistory } from 'slate-history'
+import { Editable, Slate, withReact } from 'slate-react'
 
 const initialValue = [
   {
diff --git a/site/examples/js/editable-voids.jsx b/site/examples/js/editable-voids.jsx
index a17029fb9..532b5bab4 100644
--- a/site/examples/js/editable-voids.jsx
+++ b/site/examples/js/editable-voids.jsx
@@ -1,10 +1,10 @@
-import React, { useState, useMemo } from 'react'
-import { Transforms, createEditor } from 'slate'
-import { Slate, Editable, useSlateStatic, withReact } from 'slate-react'
-import { withHistory } from 'slate-history'
 import { css } from '@emotion/css'
-import RichTextEditor from './richtext'
+import React, { useMemo, useState } from 'react'
+import { createEditor, Transforms } from 'slate'
+import { withHistory } from 'slate-history'
+import { Editable, Slate, useSlateStatic, withReact } from 'slate-react'
 import { Button, Icon, Toolbar } from './components'
+import RichTextEditor from './richtext'
 
 const EditableVoidsExample = () => {
   const editor = useMemo(
diff --git a/site/examples/js/forced-layout.jsx b/site/examples/js/forced-layout.jsx
index b6b815ffe..5186ba1c1 100644
--- a/site/examples/js/forced-layout.jsx
+++ b/site/examples/js/forced-layout.jsx
@@ -1,13 +1,13 @@
 import React, { useCallback, useMemo } from 'react'
-import { Slate, Editable, withReact } from 'slate-react'
 import {
-  Transforms,
-  createEditor,
+  Editor,
   Node,
   Element as SlateElement,
-  Editor,
+  Transforms,
+  createEditor,
 } from 'slate'
 import { withHistory } from 'slate-history'
+import { Editable, Slate, withReact } from 'slate-react'
 
 const withLayout = editor => {
   const { normalizeNode } = editor
diff --git a/site/examples/js/hovering-toolbar.jsx b/site/examples/js/hovering-toolbar.jsx
index 002d7f4e6..9282aadc7 100644
--- a/site/examples/js/hovering-toolbar.jsx
+++ b/site/examples/js/hovering-toolbar.jsx
@@ -1,8 +1,8 @@
-import React, { useMemo, useRef, useEffect } from 'react'
-import { Slate, Editable, withReact, useSlate, useFocused } from 'slate-react'
-import { Editor, createEditor, Range } from 'slate'
 import { css } from '@emotion/css'
+import React, { useEffect, useMemo, useRef } from 'react'
+import { Editor, Range, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
+import { Editable, Slate, useFocused, useSlate, withReact } from 'slate-react'
 import { Button, Icon, Menu, Portal } from './components'
 
 const HoveringMenuExample = () => {
@@ -23,7 +23,7 @@ const HoveringMenuExample = () => {
               return toggleMark(editor, 'italic')
             case 'formatUnderline':
               event.preventDefault()
-              return toggleMark(editor, 'underlined')
+              return toggleMark(editor, 'underline')
           }
         }}
       />
@@ -49,13 +49,13 @@ const Leaf = ({ attributes, children, leaf }) => {
   if (leaf.italic) {
     children = <em>{children}</em>
   }
-  if (leaf.underlined) {
+  if (leaf.underline) {
     children = <u>{children}</u>
   }
   return <span {...attributes}>{children}</span>
 }
 const HoveringToolbar = () => {
-  const ref = useRef()
+  const ref = useRef(null)
   const editor = useSlate()
   const inFocus = useFocused()
   useEffect(() => {
@@ -105,7 +105,7 @@ const HoveringToolbar = () => {
       >
         <FormatButton format="bold" icon="format_bold" />
         <FormatButton format="italic" icon="format_italic" />
-        <FormatButton format="underlined" icon="format_underlined" />
+        <FormatButton format="underline" icon="format_underlined" />
       </Menu>
     </Portal>
   )
diff --git a/site/examples/js/huge-document.jsx b/site/examples/js/huge-document.jsx
index 789c01948..deae2380e 100644
--- a/site/examples/js/huge-document.jsx
+++ b/site/examples/js/huge-document.jsx
@@ -1,21 +1,23 @@
-import React, { useMemo, useCallback } from 'react'
 import { faker } from '@faker-js/faker'
+import React, { useCallback, useMemo } from 'react'
 import { createEditor } from 'slate'
-import { Slate, Editable, withReact } from 'slate-react'
+import { Editable, Slate, withReact } from 'slate-react'
 
 const HEADINGS = 100
 const PARAGRAPHS = 7
 const initialValue = []
 for (let h = 0; h < HEADINGS; h++) {
-  initialValue.push({
-    type: 'heading',
+  const heading = {
+    type: 'heading-one',
     children: [{ text: faker.lorem.sentence() }],
-  })
+  }
+  initialValue.push(heading)
   for (let p = 0; p < PARAGRAPHS; p++) {
-    initialValue.push({
+    const paragraph = {
       type: 'paragraph',
       children: [{ text: faker.lorem.paragraph() }],
-    })
+    }
+    initialValue.push(paragraph)
   }
 }
 const HugeDocumentExample = () => {
@@ -29,7 +31,7 @@ const HugeDocumentExample = () => {
 }
 const Element = ({ attributes, children, element }) => {
   switch (element.type) {
-    case 'heading':
+    case 'heading-one':
       return <h1 {...attributes}>{children}</h1>
     default:
       return <p {...attributes}>{children}</p>
diff --git a/site/examples/js/iframe.jsx b/site/examples/js/iframe.jsx
index 51fac9fd6..45d7877ad 100644
--- a/site/examples/js/iframe.jsx
+++ b/site/examples/js/iframe.jsx
@@ -1,9 +1,9 @@
+import isHotkey from 'is-hotkey'
 import React, { useCallback, useMemo, useState } from 'react'
 import { createPortal } from 'react-dom'
-import isHotkey from 'is-hotkey'
-import { Editable, withReact, useSlate, Slate, ReactEditor } from 'slate-react'
 import { Editor, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
+import { Editable, ReactEditor, Slate, useSlate, withReact } from 'slate-react'
 import { Button, Icon, Toolbar } from './components'
 
 const HOTKEYS = {
@@ -93,7 +93,9 @@ const MarkButton = ({ format, icon }) => {
 const IFrame = ({ children, ...props }) => {
   const [iframeBody, setIframeBody] = useState(null)
   const handleLoad = e => {
-    setIframeBody(e.target.contentDocument.body)
+    const iframe = e.target
+    if (!iframe.contentDocument) return
+    setIframeBody(iframe.contentDocument.body)
   }
   return (
     <iframe srcDoc={`<!DOCTYPE html>`} {...props} onLoad={handleLoad}>
diff --git a/site/examples/js/images.jsx b/site/examples/js/images.jsx
index 1987f2fab..9f231e61f 100644
--- a/site/examples/js/images.jsx
+++ b/site/examples/js/images.jsx
@@ -1,19 +1,19 @@
-import React, { useMemo } from 'react'
-import imageExtensions from 'image-extensions'
-import isUrl from 'is-url'
-import isHotkey from 'is-hotkey'
-import { Transforms, createEditor } from 'slate'
-import {
-  Slate,
-  Editable,
-  useSlateStatic,
-  useSelected,
-  useFocused,
-  withReact,
-  ReactEditor,
-} from 'slate-react'
-import { withHistory } from 'slate-history'
 import { css } from '@emotion/css'
+import imageExtensions from 'image-extensions'
+import isHotkey from 'is-hotkey'
+import isUrl from 'is-url'
+import React, { useMemo } from 'react'
+import { Transforms, createEditor } from 'slate'
+import { withHistory } from 'slate-history'
+import {
+  Editable,
+  ReactEditor,
+  Slate,
+  useFocused,
+  useSelected,
+  useSlateStatic,
+  withReact,
+} from 'slate-react'
 import { Button, Icon, Toolbar } from './components'
 
 const ImagesExample = () => {
@@ -48,7 +48,7 @@ const withImages = editor => {
     const text = data.getData('text/plain')
     const { files } = data
     if (files && files.length > 0) {
-      for (const file of files) {
+      Array.from(files).forEach(file => {
         const reader = new FileReader()
         const [mime] = file.type.split('/')
         if (mime === 'image') {
@@ -58,7 +58,7 @@ const withImages = editor => {
           })
           reader.readAsDataURL(file)
         }
-      }
+      })
     } else if (isImageUrl(text)) {
       insertImage(editor, text)
     } else {
@@ -71,10 +71,11 @@ const insertImage = (editor, url) => {
   const text = { text: '' }
   const image = { type: 'image', url, children: [text] }
   Transforms.insertNodes(editor, image)
-  Transforms.insertNodes(editor, {
+  const paragraph = {
     type: 'paragraph',
     children: [{ text: '' }],
-  })
+  }
+  Transforms.insertNodes(editor, paragraph)
 }
 const Element = props => {
   const { attributes, children, element } = props
diff --git a/site/examples/js/inlines.jsx b/site/examples/js/inlines.jsx
index 4773e3152..efb1faa00 100644
--- a/site/examples/js/inlines.jsx
+++ b/site/examples/js/inlines.jsx
@@ -1,17 +1,17 @@
-import React, { useMemo } from 'react'
-import isUrl from 'is-url'
-import { isKeyHotkey } from 'is-hotkey'
 import { css } from '@emotion/css'
-import { Editable, withReact, useSlate, useSelected } from 'slate-react'
-import * as SlateReact from 'slate-react'
+import { isKeyHotkey } from 'is-hotkey'
+import isUrl from 'is-url'
+import React, { useMemo } from 'react'
 import {
-  Transforms,
-  Editor,
-  Range,
   createEditor,
+  Editor,
   Element as SlateElement,
+  Range,
+  Transforms,
 } from 'slate'
 import { withHistory } from 'slate-history'
+import { Editable, useSelected, useSlate, withReact } from 'slate-react'
+import * as SlateReact from 'slate-react'
 import { Button, Icon, Toolbar } from './components'
 
 const initialValue = [
@@ -326,7 +326,7 @@ const Text = props => {
           ? css`
               padding-left: 0.1px;
             `
-          : null
+          : undefined
       }
       {...attributes}
     >
diff --git a/site/examples/js/markdown-preview.jsx b/site/examples/js/markdown-preview.jsx
index 865f7e7b7..d14ab410d 100644
--- a/site/examples/js/markdown-preview.jsx
+++ b/site/examples/js/markdown-preview.jsx
@@ -1,10 +1,10 @@
+import { css } from '@emotion/css'
 import Prism from 'prismjs'
 import 'prismjs/components/prism-markdown'
 import React, { useCallback, useMemo } from 'react'
-import { Slate, Editable, withReact } from 'slate-react'
 import { Text, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
-import { css } from '@emotion/css'
+import { Editable, Slate, withReact } from 'slate-react'
 
 const MarkdownPreviewExample = () => {
   const renderLeaf = useCallback(props => <Leaf {...props} />, [])
diff --git a/site/examples/js/mentions.jsx b/site/examples/js/mentions.jsx
index 080a1839d..f99394612 100644
--- a/site/examples/js/mentions.jsx
+++ b/site/examples/js/mentions.jsx
@@ -1,27 +1,27 @@
 import React, {
-  useMemo,
-  useCallback,
-  useRef,
-  useEffect,
-  useState,
   Fragment,
+  useCallback,
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
 } from 'react'
 import { Editor, Transforms, Range, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
 import {
-  Slate,
   Editable,
   ReactEditor,
-  withReact,
-  useSelected,
+  Slate,
   useFocused,
+  useSelected,
+  withReact,
 } from 'slate-react'
 import { Portal } from './components'
 import { IS_MAC } from './utils/environment'
 
 const MentionExample = () => {
-  const ref = useRef()
-  const [target, setTarget] = useState()
+  const ref = useRef(null)
+  const [target, setTarget] = useState(null)
   const [index, setIndex] = useState(0)
   const [search, setSearch] = useState('')
   const renderElement = useCallback(props => <Element {...props} />, [])
@@ -64,7 +64,7 @@ const MentionExample = () => {
     [chars, editor, index, target]
   )
   useEffect(() => {
-    if (target && chars.length > 0) {
+    if (target && chars.length > 0 && ref.current) {
       const el = ref.current
       const domRange = ReactEditor.toDOMRange(editor, target)
       const rect = domRange.getBoundingClientRect()
@@ -124,7 +124,7 @@ const MentionExample = () => {
             {chars.map((char, i) => (
               <div
                 key={char}
-                onClick={() => {
+                onClick={e => {
                   Transforms.select(editor, target)
                   insertMention(editor, char)
                   setTarget(null)
diff --git a/site/examples/js/paste-html.jsx b/site/examples/js/paste-html.jsx
index 20a6f5da2..6a553088d 100644
--- a/site/examples/js/paste-html.jsx
+++ b/site/examples/js/paste-html.jsx
@@ -1,19 +1,19 @@
+import { css } from '@emotion/css'
 import React, { useCallback, useMemo } from 'react'
-import { jsx } from 'slate-hyperscript'
 import { Transforms, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
-import { css } from '@emotion/css'
+import { jsx } from 'slate-hyperscript'
 import {
-  Slate,
   Editable,
-  withReact,
-  useSelected,
+  Slate,
   useFocused,
+  useSelected,
+  withReact,
 } from 'slate-react'
 
 const ELEMENT_TAGS = {
   A: el => ({ type: 'link', url: el.getAttribute('href') }),
-  BLOCKQUOTE: () => ({ type: 'quote' }),
+  BLOCKQUOTE: () => ({ type: 'block-quote' }),
   H1: () => ({ type: 'heading-one' }),
   H2: () => ({ type: 'heading-two' }),
   H3: () => ({ type: 'heading-three' }),
@@ -24,10 +24,9 @@ const ELEMENT_TAGS = {
   LI: () => ({ type: 'list-item' }),
   OL: () => ({ type: 'numbered-list' }),
   P: () => ({ type: 'paragraph' }),
-  PRE: () => ({ type: 'code' }),
+  PRE: () => ({ type: 'code-block' }),
   UL: () => ({ type: 'bulleted-list' }),
 }
-// COMPAT: `B` is omitted here because Google Docs uses `<b>` in weird ways.
 const TEXT_TAGS = {
   CODE: () => ({ code: true }),
   DEL: () => ({ strikethrough: true }),
@@ -66,7 +65,7 @@ export const deserialize = el => {
     return jsx('element', attrs, children)
   }
   if (TEXT_TAGS[nodeName]) {
-    const attrs = TEXT_TAGS[nodeName](el)
+    const attrs = TEXT_TAGS[nodeName]()
     return children.map(child => jsx('text', attrs, child))
   }
   return children
@@ -113,9 +112,9 @@ const Element = props => {
   switch (element.type) {
     default:
       return <p {...attributes}>{children}</p>
-    case 'quote':
+    case 'block-quote':
       return <blockquote {...attributes}>{children}</blockquote>
-    case 'code':
+    case 'code-block':
       return (
         <pre>
           <code {...attributes}>{children}</code>
@@ -141,7 +140,7 @@ const Element = props => {
       return <ol {...attributes}>{children}</ol>
     case 'link':
       return (
-        <SafeLink href={element.url} {...attributes}>
+        <SafeLink href={element.url} attributes={attributes}>
           {children}
         </SafeLink>
       )
@@ -150,7 +149,7 @@ const Element = props => {
   }
 }
 const allowedSchemes = ['http:', 'https:', 'mailto:', 'tel:']
-const SafeLink = ({ attributes, children, href }) => {
+const SafeLink = ({ children, href, attributes }) => {
   const safeHref = useMemo(() => {
     let parsedUrl = null
     try {
diff --git a/site/examples/js/richtext.jsx b/site/examples/js/richtext.jsx
index 376b6bd85..83963a506 100644
--- a/site/examples/js/richtext.jsx
+++ b/site/examples/js/richtext.jsx
@@ -1,13 +1,13 @@
-import React, { useCallback, useMemo } from 'react'
 import isHotkey from 'is-hotkey'
-import { Editable, withReact, useSlate, Slate } from 'slate-react'
+import React, { useCallback, useMemo } from 'react'
 import {
   Editor,
+  Element as SlateElement,
   Transforms,
   createEditor,
-  Element as SlateElement,
 } from 'slate'
 import { withHistory } from 'slate-history'
+import { Editable, Slate, useSlate, withReact } from 'slate-react'
 import { Button, Icon, Toolbar } from './components'
 
 const HOTKEYS = {
@@ -62,19 +62,19 @@ const toggleBlock = (editor, format) => {
   const isActive = isBlockActive(
     editor,
     format,
-    TEXT_ALIGN_TYPES.includes(format) ? 'align' : 'type'
+    isAlignType(format) ? 'align' : 'type'
   )
-  const isList = LIST_TYPES.includes(format)
+  const isList = isListType(format)
   Transforms.unwrapNodes(editor, {
     match: n =>
       !Editor.isEditor(n) &&
       SlateElement.isElement(n) &&
-      LIST_TYPES.includes(n.type) &&
-      !TEXT_ALIGN_TYPES.includes(format),
+      isListType(n.type) &&
+      !isAlignType(format),
     split: true,
   })
   let newProperties
-  if (TEXT_ALIGN_TYPES.includes(format)) {
+  if (isAlignType(format)) {
     newProperties = {
       align: isActive ? undefined : format,
     }
@@ -103,10 +103,15 @@ const isBlockActive = (editor, format, blockType = 'type') => {
   const [match] = Array.from(
     Editor.nodes(editor, {
       at: Editor.unhangRange(editor, selection),
-      match: n =>
-        !Editor.isEditor(n) &&
-        SlateElement.isElement(n) &&
-        n[blockType] === format,
+      match: n => {
+        if (!Editor.isEditor(n) && SlateElement.isElement(n)) {
+          if (blockType === 'align' && isAlignElement(n)) {
+            return n.align === format
+          }
+          return n.type === format
+        }
+        return false
+      },
     })
   )
   return !!match
@@ -116,7 +121,10 @@ const isMarkActive = (editor, format) => {
   return marks ? marks[format] === true : false
 }
 const Element = ({ attributes, children, element }) => {
-  const style = { textAlign: element.align }
+  const style = {}
+  if (isAlignElement(element)) {
+    style.textAlign = element.align
+  }
   switch (element.type) {
     case 'block-quote':
       return (
@@ -184,7 +192,7 @@ const BlockButton = ({ format, icon }) => {
       active={isBlockActive(
         editor,
         format,
-        TEXT_ALIGN_TYPES.includes(format) ? 'align' : 'type'
+        isAlignType(format) ? 'align' : 'type'
       )}
       onMouseDown={event => {
         event.preventDefault()
@@ -209,6 +217,15 @@ const MarkButton = ({ format, icon }) => {
     </Button>
   )
 }
+const isAlignType = format => {
+  return TEXT_ALIGN_TYPES.includes(format)
+}
+const isListType = format => {
+  return LIST_TYPES.includes(format)
+}
+const isAlignElement = element => {
+  return 'align' in element
+}
 const initialValue = [
   {
     type: 'paragraph',
diff --git a/site/examples/js/search-highlighting.jsx b/site/examples/js/search-highlighting.jsx
index 0abc62061..d4bd3ec43 100644
--- a/site/examples/js/search-highlighting.jsx
+++ b/site/examples/js/search-highlighting.jsx
@@ -1,18 +1,19 @@
-import React, { useState, useCallback, useMemo } from 'react'
-import { Slate, Editable, withReact } from 'slate-react'
-import { Text, createEditor } from 'slate'
 import { css } from '@emotion/css'
+import React, { useCallback, useMemo, useState } from 'react'
+import { Element, Text, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
+import { Editable, Slate, withReact } from 'slate-react'
 import { Icon, Toolbar } from './components'
 
 const SearchHighlightingExample = () => {
-  const [search, setSearch] = useState()
+  const [search, setSearch] = useState('')
   const editor = useMemo(() => withHistory(withReact(createEditor())), [])
   const decorate = useCallback(
     ([node, path]) => {
       const ranges = []
       if (
         search &&
+        Element.isElement(node) &&
         Array.isArray(node.children) &&
         node.children.every(Text.isText)
       ) {
@@ -93,13 +94,14 @@ const SearchHighlightingExample = () => {
   )
 }
 const Leaf = ({ attributes, children, leaf }) => {
+  const highlightLeaf = leaf
   return (
     <span
       {...attributes}
-      {...(leaf.highlight && { 'data-cy': 'search-highlighted' })}
+      {...(highlightLeaf.highlight && { 'data-cy': 'search-highlighted' })}
       className={css`
-        font-weight: ${leaf.bold && 'bold'};
-        background-color: ${leaf.highlight && '#ffeeba'};
+        font-weight: ${highlightLeaf.bold && 'bold'};
+        background-color: ${highlightLeaf.highlight && '#ffeeba'};
       `}
     >
       {children}
diff --git a/site/examples/js/tables.jsx b/site/examples/js/tables.jsx
index ec9e9b050..955581cc5 100644
--- a/site/examples/js/tables.jsx
+++ b/site/examples/js/tables.jsx
@@ -1,13 +1,13 @@
 import React, { useCallback, useMemo } from 'react'
-import { Slate, Editable, withReact } from 'slate-react'
 import {
   Editor,
-  Range,
   Point,
-  createEditor,
+  Range,
   Element as SlateElement,
+  createEditor,
 } from 'slate'
 import { withHistory } from 'slate-history'
+import { Editable, Slate, withReact } from 'slate-react'
 
 const TablesExample = () => {
   const renderElement = useCallback(props => <Element {...props} />, [])
diff --git a/site/examples/ts/check-lists.tsx b/site/examples/ts/check-lists.tsx
index 42a93a613..e443a45bf 100644
--- a/site/examples/ts/check-lists.tsx
+++ b/site/examples/ts/check-lists.tsx
@@ -1,23 +1,29 @@
-import React, { useMemo, useCallback } from 'react'
+import { css } from '@emotion/css'
+import React, { ChangeEvent, useCallback, useMemo } from 'react'
+import {
+  Descendant,
+  Editor,
+  Point,
+  Range,
+  Element as SlateElement,
+  Transforms,
+  createEditor,
+} from 'slate'
+import { withHistory } from 'slate-history'
 import {
-  Slate,
   Editable,
-  withReact,
-  useSlateStatic,
-  useReadOnly,
   ReactEditor,
+  RenderElementProps,
+  Slate,
+  useReadOnly,
+  useSlateStatic,
+  withReact,
 } from 'slate-react'
 import {
-  Editor,
-  Transforms,
-  Range,
-  Point,
-  createEditor,
-  Descendant,
-  Element as SlateElement,
-} from 'slate'
-import { css } from '@emotion/css'
-import { withHistory } from 'slate-history'
+  CheckListItemElement as CheckListItemType,
+  CustomEditor,
+  RenderElementPropsFor,
+} from './custom-types.d'
 
 const initialValue: Descendant[] = [
   {
@@ -65,7 +71,10 @@ const initialValue: Descendant[] = [
 ]
 
 const CheckListsExample = () => {
-  const renderElement = useCallback(props => <Element {...props} />, [])
+  const renderElement = useCallback(
+    (props: RenderElementProps) => <Element {...props} />,
+    []
+  )
   const editor = useMemo(
     () => withChecklists(withHistory(withReact(createEditor()))),
     []
@@ -83,7 +92,7 @@ const CheckListsExample = () => {
   )
 }
 
-const withChecklists = editor => {
+const withChecklists = (editor: CustomEditor) => {
   const { deleteBackward } = editor
 
   editor.deleteBackward = (...args) => {
@@ -122,7 +131,7 @@ const withChecklists = editor => {
   return editor
 }
 
-const Element = props => {
+const Element = (props: RenderElementProps) => {
   const { attributes, children, element } = props
 
   switch (element.type) {
@@ -133,10 +142,14 @@ const Element = props => {
   }
 }
 
-const CheckListItemElement = ({ attributes, children, element }) => {
+const CheckListItemElement = ({
+  attributes,
+  children,
+  element,
+}: RenderElementPropsFor<CheckListItemType>) => {
+  const { checked } = element
   const editor = useSlateStatic()
   const readOnly = useReadOnly()
-  const { checked } = element
   return (
     <div
       {...attributes}
@@ -159,7 +172,7 @@ const CheckListItemElement = ({ attributes, children, element }) => {
         <input
           type="checkbox"
           checked={checked}
-          onChange={event => {
+          onChange={(event: ChangeEvent<HTMLInputElement>) => {
             const path = ReactEditor.findPath(editor, element)
             const newProperties: Partial<SlateElement> = {
               checked: event.target.checked,
diff --git a/site/examples/ts/code-highlighting.tsx b/site/examples/ts/code-highlighting.tsx
index dede00763..c663cb1e0 100644
--- a/site/examples/ts/code-highlighting.tsx
+++ b/site/examples/ts/code-highlighting.tsx
@@ -1,39 +1,45 @@
+import { css } from '@emotion/css'
+import isHotkey from 'is-hotkey'
 import Prism from 'prismjs'
+import 'prismjs/components/prism-java'
 import 'prismjs/components/prism-javascript'
 import 'prismjs/components/prism-jsx'
-import 'prismjs/components/prism-typescript'
-import 'prismjs/components/prism-tsx'
 import 'prismjs/components/prism-markdown'
-import 'prismjs/components/prism-python'
 import 'prismjs/components/prism-php'
+import 'prismjs/components/prism-python'
 import 'prismjs/components/prism-sql'
-import 'prismjs/components/prism-java'
-import React, { useCallback, useState } from 'react'
+import 'prismjs/components/prism-tsx'
+import 'prismjs/components/prism-typescript'
+import React, { ChangeEvent, MouseEvent, useCallback, useState } from 'react'
 import {
-  createEditor,
-  Node,
   Editor,
-  Range,
   Element,
-  Transforms,
+  Node,
   NodeEntry,
+  Range,
+  Transforms,
+  createEditor,
 } from 'slate'
+import { withHistory } from 'slate-history'
 import {
-  withReact,
-  Slate,
   Editable,
+  ReactEditor,
   RenderElementProps,
   RenderLeafProps,
+  Slate,
   useSlate,
-  ReactEditor,
   useSlateStatic,
+  withReact,
 } from 'slate-react'
-import { withHistory } from 'slate-history'
-import isHotkey from 'is-hotkey'
-import { css } from '@emotion/css'
-import { CodeBlockElement } from './custom-types.d'
-import { normalizeTokens } from './utils/normalize-tokens'
 import { Button, Icon, Toolbar } from './components'
+import {
+  CodeBlockElement,
+  CodeLineElement,
+  CustomEditor,
+  CustomElement,
+  CustomText,
+} from './custom-types.d'
+import { normalizeTokens } from './utils/normalize-tokens'
 
 const ParagraphType = 'paragraph'
 const CodeBlockType = 'code-block'
@@ -139,7 +145,7 @@ const CodeBlockButton = () => {
     <Button
       data-test-id="code-block-button"
       active
-      onMouseDown={event => {
+      onMouseDown={(event: MouseEvent<HTMLButtonElement>) => {
         event.preventDefault()
         handleClick()
       }}
@@ -160,11 +166,11 @@ const renderLeaf = (props: RenderLeafProps) => {
   )
 }
 
-const useDecorate = (editor: Editor) => {
+const useDecorate = (editor: CustomEditor) => {
   return useCallback(
-    ([node, path]) => {
+    ([node, path]: NodeEntry) => {
       if (Element.isElement(node) && node.type === CodeLineType) {
-        const ranges = editor.nodeToDecorations.get(node) || []
+        const ranges = editor.nodeToDecorations?.get(node) || []
         return ranges
       }
 
@@ -174,11 +180,20 @@ const useDecorate = (editor: Editor) => {
   )
 }
 
+interface TokenRange extends Range {
+  token: boolean
+  [key: string]: unknown
+}
+
+type EditorWithDecorations = CustomEditor & {
+  nodeToDecorations: Map<Element, TokenRange[]>
+}
+
 const getChildNodeToDecorations = ([
   block,
   blockPath,
-]: NodeEntry<CodeBlockElement>) => {
-  const nodeToDecorations = new Map<Element, Range[]>()
+]: NodeEntry<CodeBlockElement>): Map<Element, TokenRange[]> => {
+  const nodeToDecorations = new Map<Element, TokenRange[]>()
 
   const text = block.children.map(line => Node.string(line)).join('\n')
   const language = block.language
@@ -222,10 +237,10 @@ const getChildNodeToDecorations = ([
 
 // precalculate editor.nodeToDecorations map to use it inside decorate function then
 const SetNodeToDecorations = () => {
-  const editor = useSlate()
+  const editor = useSlate() as EditorWithDecorations
 
   const blockEntries = Array.from(
-    Editor.nodes(editor, {
+    Editor.nodes<CodeBlockElement>(editor, {
       at: [],
       mode: 'highest',
       match: n => Element.isElement(n) && n.type === CodeBlockType,
@@ -241,8 +256,8 @@ const SetNodeToDecorations = () => {
   return null
 }
 
-const useOnKeydown = (editor: Editor) => {
-  const onKeyDown: React.KeyboardEventHandler = useCallback(
+const useOnKeydown = (editor: CustomEditor) => {
+  const onKeyDown: React.KeyboardEventHandler<HTMLDivElement> = useCallback(
     e => {
       if (isHotkey('tab', e)) {
         // handle tab key, insert spaces
@@ -257,7 +272,13 @@ const useOnKeydown = (editor: Editor) => {
   return onKeyDown
 }
 
-const LanguageSelect = (props: JSX.IntrinsicElements['select']) => {
+interface LanguageSelectProps
+  extends React.SelectHTMLAttributes<HTMLSelectElement> {
+  value?: string
+  onChange: (event: ChangeEvent<HTMLSelectElement>) => void
+}
+
+const LanguageSelect = (props: LanguageSelectProps) => {
   return (
     <select
       data-test-id="language-select"
@@ -297,13 +318,13 @@ const mergeMaps = <K, V>(...maps: Map<K, V>[]) => {
   return map
 }
 
-const toChildren = (content: string) => [{ text: content }]
-const toCodeLines = (content: string): Element[] =>
+const toChildren = (content: string): CustomText[] => [{ text: content }]
+const toCodeLines = (content: string): CodeLineElement[] =>
   content
     .split('\n')
     .map(line => ({ type: CodeLineType, children: toChildren(line) }))
 
-const initialValue: Element[] = [
+const initialValue: CustomElement[] = [
   {
     type: ParagraphType,
     children: toChildren(
diff --git a/site/examples/ts/components/index.tsx b/site/examples/ts/components/index.tsx
index 82a061b49..2cf5b8df9 100644
--- a/site/examples/ts/components/index.tsx
+++ b/site/examples/ts/components/index.tsx
@@ -1,12 +1,11 @@
-import React, { ReactNode, Ref, PropsWithChildren } from 'react'
+import { css, cx } from '@emotion/css'
+import React, { PropsWithChildren, ReactNode, Ref } from 'react'
 import ReactDOM from 'react-dom'
-import { cx, css } from '@emotion/css'
 
 interface BaseProps {
   className: string
   [key: string]: unknown
 }
-type OrNull<T> = T | null
 
 export const Button = React.forwardRef(
   (
@@ -21,7 +20,7 @@ export const Button = React.forwardRef(
         reversed: boolean
       } & BaseProps
     >,
-    ref: Ref<OrNull<HTMLSpanElement>>
+    ref: Ref<HTMLSpanElement>
   ) => (
     <span
       {...props}
@@ -43,67 +42,10 @@ export const Button = React.forwardRef(
   )
 )
 
-export const EditorValue = React.forwardRef(
-  (
-    {
-      className,
-      value,
-      ...props
-    }: PropsWithChildren<
-      {
-        value: any
-      } & BaseProps
-    >,
-    ref: Ref<OrNull<null>>
-  ) => {
-    const textLines = value.document.nodes
-      .map(node => node.text)
-      .toArray()
-      .join('\n')
-    return (
-      <div
-        ref={ref}
-        {...props}
-        className={cx(
-          className,
-          css`
-            margin: 30px -20px 0;
-          `
-        )}
-      >
-        <div
-          className={css`
-            font-size: 14px;
-            padding: 5px 20px;
-            color: #404040;
-            border-top: 2px solid #eeeeee;
-            background: #f8f8f8;
-          `}
-        >
-          Slate's value as text
-        </div>
-        <div
-          className={css`
-            color: #404040;
-            font: 12px monospace;
-            white-space: pre-wrap;
-            padding: 10px 20px;
-            div {
-              margin: 0 0 0.5em;
-            }
-          `}
-        >
-          {textLines}
-        </div>
-      </div>
-    )
-  }
-)
-
 export const Icon = React.forwardRef(
   (
     { className, ...props }: PropsWithChildren<BaseProps>,
-    ref: Ref<OrNull<HTMLSpanElement>>
+    ref: Ref<HTMLSpanElement>
   ) => (
     <span
       {...props}
@@ -123,7 +65,7 @@ export const Icon = React.forwardRef(
 export const Instruction = React.forwardRef(
   (
     { className, ...props }: PropsWithChildren<BaseProps>,
-    ref: Ref<OrNull<HTMLDivElement>>
+    ref: Ref<HTMLDivElement>
   ) => (
     <div
       {...props}
@@ -145,7 +87,7 @@ export const Instruction = React.forwardRef(
 export const Menu = React.forwardRef(
   (
     { className, ...props }: PropsWithChildren<BaseProps>,
-    ref: Ref<OrNull<HTMLDivElement>>
+    ref: Ref<HTMLDivElement>
   ) => (
     <div
       {...props}
@@ -176,7 +118,7 @@ export const Portal = ({ children }: { children?: ReactNode }) => {
 export const Toolbar = React.forwardRef(
   (
     { className, ...props }: PropsWithChildren<BaseProps>,
-    ref: Ref<OrNull<HTMLDivElement>>
+    ref: Ref<HTMLDivElement>
   ) => (
     <Menu
       {...props}
diff --git a/site/examples/ts/custom-placeholder.tsx b/site/examples/ts/custom-placeholder.tsx
index 8e1de9d78..3c22645b9 100644
--- a/site/examples/ts/custom-placeholder.tsx
+++ b/site/examples/ts/custom-placeholder.tsx
@@ -1,7 +1,7 @@
 import React, { useMemo } from 'react'
-import { createEditor, Descendant } from 'slate'
-import { Slate, Editable, withReact } from 'slate-react'
+import { Descendant, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
+import { Editable, RenderPlaceholderProps, Slate, withReact } from 'slate-react'
 
 const initialValue: Descendant[] = [
   {
@@ -16,7 +16,10 @@ const PlainTextExample = () => {
     <Slate editor={editor} initialValue={initialValue}>
       <Editable
         placeholder="Type something"
-        renderPlaceholder={({ children, attributes }) => (
+        renderPlaceholder={({
+          children,
+          attributes,
+        }: RenderPlaceholderProps) => (
           <div {...attributes}>
             <p>{children}</p>
             <pre>
diff --git a/site/examples/ts/custom-types.d.ts b/site/examples/ts/custom-types.d.ts
index 6ffce57b4..15da58779 100644
--- a/site/examples/ts/custom-types.d.ts
+++ b/site/examples/ts/custom-types.d.ts
@@ -26,7 +26,7 @@ export type EditableVoidElement = {
 }
 
 export type HeadingElement = {
-  type: 'heading'
+  type: 'heading-one'
   align?: string
   children: Descendant[]
 }
@@ -37,6 +37,30 @@ export type HeadingTwoElement = {
   children: Descendant[]
 }
 
+export type HeadingThreeElement = {
+  type: 'heading-three'
+  align?: string
+  children: Descendant[]
+}
+
+export type HeadingFourElement = {
+  type: 'heading-four'
+  align?: string
+  children: Descendant[]
+}
+
+export type HeadingFiveElement = {
+  type: 'heading-five'
+  align?: string
+  children: Descendant[]
+}
+
+export type HeadingSixElement = {
+  type: 'heading-six'
+  align?: string
+  children: Descendant[]
+}
+
 export type ImageElement = {
   type: 'image'
   url: string
@@ -51,6 +75,11 @@ export type BadgeElement = { type: 'badge'; children: Descendant[] }
 
 export type ListItemElement = { type: 'list-item'; children: Descendant[] }
 
+export type NumberedListItemElement = {
+  type: 'numbered-list'
+  children: Descendant[]
+}
+
 export type MentionElement = {
   type: 'mention'
   character: string
@@ -84,6 +113,17 @@ export type CodeLineElement = {
   children: Descendant[]
 }
 
+export type CustomElementWithAlign =
+  | ParagraphElement
+  | HeadingElement
+  | HeadingTwoElement
+  | HeadingThreeElement
+  | HeadingFourElement
+  | HeadingFiveElement
+  | HeadingSixElement
+  | BlockQuoteElement
+  | BulletedListElement
+
 type CustomElement =
   | BlockQuoteElement
   | BulletedListElement
@@ -91,11 +131,16 @@ type CustomElement =
   | EditableVoidElement
   | HeadingElement
   | HeadingTwoElement
+  | HeadingThreeElement
+  | HeadingFourElement
+  | HeadingFiveElement
+  | HeadingSixElement
   | ImageElement
   | LinkElement
   | ButtonElement
   | BadgeElement
   | ListItemElement
+  | NumberedListItemElement
   | MentionElement
   | ParagraphElement
   | TableElement
@@ -106,17 +151,33 @@ type CustomElement =
   | CodeBlockElement
   | CodeLineElement
 
+export type CustomElementType = CustomElement['type']
+
 export type CustomText = {
   bold?: boolean
   italic?: boolean
   code?: boolean
+  underline?: boolean
+  strikethrough?: boolean
+  // MARKDOWN PREVIEW SPECIFIC LEAF
+  underlined?: boolean
+  title?: boolean
+  list?: boolean
+  hr?: boolean
+  blockquote?: boolean
   text: string
 }
 
+export type CustomTextKey = keyof Omit<CustomText, 'text'>
+
 export type EmptyText = {
   text: string
 }
 
+export type RenderElementPropsFor<T> = RenderElementProps & {
+  element: T
+}
+
 export type CustomEditor = BaseEditor &
   ReactEditor &
   HistoryEditor & {
@@ -127,7 +188,7 @@ declare module 'slate' {
   interface CustomTypes {
     Editor: CustomEditor
     Element: CustomElement
-    Text: CustomText | EmptyText
+    Text: CustomText
     Range: BaseRange & {
       [key: string]: unknown
     }
diff --git a/site/examples/ts/editable-voids.tsx b/site/examples/ts/editable-voids.tsx
index 475b2fbf4..55dd3da7f 100644
--- a/site/examples/ts/editable-voids.tsx
+++ b/site/examples/ts/editable-voids.tsx
@@ -1,12 +1,18 @@
-import React, { useState, useMemo } from 'react'
-import { Transforms, createEditor, Descendant } from 'slate'
-import { Slate, Editable, useSlateStatic, withReact } from 'slate-react'
-import { withHistory } from 'slate-history'
 import { css } from '@emotion/css'
+import React, { MouseEvent, useMemo, useState } from 'react'
+import { createEditor, Descendant, Transforms } from 'slate'
+import { withHistory } from 'slate-history'
+import {
+  Editable,
+  RenderElementProps,
+  Slate,
+  useSlateStatic,
+  withReact,
+} from 'slate-react'
 
-import RichTextEditor from './richtext'
 import { Button, Icon, Toolbar } from './components'
-import { EditableVoidElement } from './custom-types.d'
+import { CustomEditor, EditableVoidElement } from './custom-types.d'
+import RichTextEditor from './richtext'
 
 const EditableVoidsExample = () => {
   const editor = useMemo(
@@ -28,7 +34,7 @@ const EditableVoidsExample = () => {
   )
 }
 
-const withEditableVoids = editor => {
+const withEditableVoids = (editor: CustomEditor) => {
   const { isVoid } = editor
 
   editor.isVoid = element => {
@@ -38,7 +44,7 @@ const withEditableVoids = editor => {
   return editor
 }
 
-const insertEditableVoid = editor => {
+const insertEditableVoid = (editor: CustomEditor) => {
   const text = { text: '' }
   const voidNode: EditableVoidElement = {
     type: 'editable-void',
@@ -47,7 +53,7 @@ const insertEditableVoid = editor => {
   Transforms.insertNodes(editor, voidNode)
 }
 
-const Element = props => {
+const Element = (props: RenderElementProps) => {
   const { attributes, children, element } = props
 
   switch (element.type) {
@@ -62,7 +68,11 @@ const unsetWidthStyle = css`
   width: unset;
 `
 
-const EditableVoid = ({ attributes, children, element }) => {
+const EditableVoid = ({
+  attributes,
+  children,
+  element,
+}: RenderElementProps) => {
   const [inputValue, setInputValue] = useState('')
 
   return (
@@ -81,7 +91,7 @@ const EditableVoid = ({ attributes, children, element }) => {
           `}
           type="text"
           value={inputValue}
-          onChange={e => {
+          onChange={(e: React.ChangeEvent<HTMLInputElement>) => {
             setInputValue(e.target.value)
           }}
         />
@@ -120,7 +130,7 @@ const InsertEditableVoidButton = () => {
   const editor = useSlateStatic()
   return (
     <Button
-      onMouseDown={event => {
+      onMouseDown={(event: MouseEvent<HTMLSpanElement>) => {
         event.preventDefault()
         insertEditableVoid(editor)
       }}
diff --git a/site/examples/ts/embeds.tsx b/site/examples/ts/embeds.tsx
index 248becff1..2a4e5c618 100644
--- a/site/examples/ts/embeds.tsx
+++ b/site/examples/ts/embeds.tsx
@@ -1,4 +1,4 @@
-import React, { useMemo } from 'react'
+import React, { ChangeEvent, useMemo } from 'react'
 import {
   Transforms,
   createEditor,
@@ -11,7 +11,13 @@ import {
   withReact,
   useSlateStatic,
   ReactEditor,
+  RenderElementProps,
 } from 'slate-react'
+import {
+  CustomEditor,
+  RenderElementPropsFor,
+  VideoElement as VideoElementType,
+} from './custom-types.d'
 
 const EmbedsExample = () => {
   const editor = useMemo(() => withEmbeds(withReact(createEditor())), [])
@@ -25,13 +31,13 @@ const EmbedsExample = () => {
   )
 }
 
-const withEmbeds = editor => {
+const withEmbeds = (editor: CustomEditor) => {
   const { isVoid } = editor
   editor.isVoid = element => (element.type === 'video' ? true : isVoid(element))
   return editor
 }
 
-const Element = props => {
+const Element = (props: RenderElementProps) => {
   const { attributes, children, element } = props
   switch (element.type) {
     case 'video':
@@ -43,12 +49,16 @@ const Element = props => {
 
 const allowedSchemes = ['http:', 'https:']
 
-const VideoElement = ({ attributes, children, element }) => {
+const VideoElement = ({
+  attributes,
+  children,
+  element,
+}: RenderElementPropsFor<VideoElementType>) => {
   const editor = useSlateStatic()
   const { url } = element
 
   const safeUrl = useMemo(() => {
-    let parsedUrl: URL = null
+    let parsedUrl: URL | null = null
     try {
       parsedUrl = new URL(url)
       // eslint-disable-next-line no-empty
@@ -98,17 +108,22 @@ const VideoElement = ({ attributes, children, element }) => {
   )
 }
 
-const UrlInput = ({ url, onChange }) => {
+interface UrlInputProps {
+  url: string
+  onChange: (url: string) => void
+}
+
+const UrlInput = ({ url, onChange }: UrlInputProps) => {
   const [value, setValue] = React.useState(url)
   return (
     <input
       value={value}
-      onClick={e => e.stopPropagation()}
+      onClick={(e: React.MouseEvent) => e.stopPropagation()}
       style={{
         marginTop: '5px',
         boxSizing: 'border-box',
       }}
-      onChange={e => {
+      onChange={(e: ChangeEvent<HTMLInputElement>) => {
         const newUrl = e.target.value
         setValue(newUrl)
         onChange(newUrl)
diff --git a/site/examples/ts/forced-layout.tsx b/site/examples/ts/forced-layout.tsx
index b534d1a60..1afefd33c 100644
--- a/site/examples/ts/forced-layout.tsx
+++ b/site/examples/ts/forced-layout.tsx
@@ -1,20 +1,26 @@
 import React, { useCallback, useMemo } from 'react'
-import { Slate, Editable, withReact } from 'slate-react'
 import {
-  Transforms,
-  createEditor,
-  Node,
-  Element as SlateElement,
   Descendant,
   Editor,
+  Node,
+  NodeEntry,
+  Element as SlateElement,
+  Transforms,
+  createEditor,
 } from 'slate'
 import { withHistory } from 'slate-history'
-import { ParagraphElement, TitleElement } from './custom-types.d'
+import { Editable, RenderElementProps, Slate, withReact } from 'slate-react'
+import {
+  CustomEditor,
+  CustomElementType,
+  ParagraphElement,
+  TitleElement,
+} from './custom-types.d'
 
-const withLayout = editor => {
+const withLayout = (editor: CustomEditor) => {
   const { normalizeNode } = editor
 
-  editor.normalizeNode = ([node, path]) => {
+  editor.normalizeNode = ([node, path]: NodeEntry) => {
     if (path.length === 0) {
       if (editor.children.length <= 1 && Editor.string(editor, [0, 0]) === '') {
         const title: TitleElement = {
@@ -36,9 +42,9 @@ const withLayout = editor => {
       }
 
       for (const [child, childPath] of Node.children(editor, path)) {
-        let type: string
+        let type: CustomElementType
         const slateIndex = childPath[0]
-        const enforceType = type => {
+        const enforceType = (type: CustomElementType) => {
           if (SlateElement.isElement(child) && child.type !== type) {
             const newProperties: Partial<SlateElement> = { type }
             Transforms.setNodes<SlateElement>(editor, newProperties, {
@@ -68,7 +74,10 @@ const withLayout = editor => {
 }
 
 const ForcedLayoutExample = () => {
-  const renderElement = useCallback(props => <Element {...props} />, [])
+  const renderElement = useCallback(
+    (props: RenderElementProps) => <Element {...props} />,
+    []
+  )
   const editor = useMemo(
     () => withLayout(withHistory(withReact(createEditor()))),
     []
@@ -85,7 +94,7 @@ const ForcedLayoutExample = () => {
   )
 }
 
-const Element = ({ attributes, children, element }) => {
+const Element = ({ attributes, children, element }: RenderElementProps) => {
   switch (element.type) {
     case 'title':
       return <h2 {...attributes}>{children}</h2>
diff --git a/site/examples/ts/hovering-toolbar.tsx b/site/examples/ts/hovering-toolbar.tsx
index a8db49e7c..7135ab776 100644
--- a/site/examples/ts/hovering-toolbar.tsx
+++ b/site/examples/ts/hovering-toolbar.tsx
@@ -1,17 +1,18 @@
-import React, { useMemo, useRef, useEffect } from 'react'
-import { Slate, Editable, withReact, useSlate, useFocused } from 'slate-react'
-import {
-  Editor,
-  Transforms,
-  Text,
-  createEditor,
-  Descendant,
-  Range,
-} from 'slate'
 import { css } from '@emotion/css'
+import React, { MouseEvent, useEffect, useMemo, useRef } from 'react'
+import { Descendant, Editor, Range, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
+import {
+  Editable,
+  RenderLeafProps,
+  Slate,
+  useFocused,
+  useSlate,
+  withReact,
+} from 'slate-react'
 
 import { Button, Icon, Menu, Portal } from './components'
+import { CustomEditor, CustomTextKey } from './custom-types.d'
 
 const HoveringMenuExample = () => {
   const editor = useMemo(() => withHistory(withReact(createEditor())), [])
@@ -32,7 +33,7 @@ const HoveringMenuExample = () => {
               return toggleMark(editor, 'italic')
             case 'formatUnderline':
               event.preventDefault()
-              return toggleMark(editor, 'underlined')
+              return toggleMark(editor, 'underline')
           }
         }}
       />
@@ -40,7 +41,7 @@ const HoveringMenuExample = () => {
   )
 }
 
-const toggleMark = (editor, format) => {
+const toggleMark = (editor: CustomEditor, format: CustomTextKey) => {
   const isActive = isMarkActive(editor, format)
 
   if (isActive) {
@@ -50,12 +51,12 @@ const toggleMark = (editor, format) => {
   }
 }
 
-const isMarkActive = (editor, format) => {
+const isMarkActive = (editor: CustomEditor, format: CustomTextKey) => {
   const marks = Editor.marks(editor)
   return marks ? marks[format] === true : false
 }
 
-const Leaf = ({ attributes, children, leaf }) => {
+const Leaf = ({ attributes, children, leaf }: RenderLeafProps) => {
   if (leaf.bold) {
     children = <strong>{children}</strong>
   }
@@ -64,7 +65,7 @@ const Leaf = ({ attributes, children, leaf }) => {
     children = <em>{children}</em>
   }
 
-  if (leaf.underlined) {
+  if (leaf.underline) {
     children = <u>{children}</u>
   }
 
@@ -72,7 +73,7 @@ const Leaf = ({ attributes, children, leaf }) => {
 }
 
 const HoveringToolbar = () => {
-  const ref = useRef<HTMLDivElement | null>()
+  const ref = useRef<HTMLDivElement | null>(null)
   const editor = useSlate()
   const inFocus = useFocused()
 
@@ -95,7 +96,7 @@ const HoveringToolbar = () => {
     }
 
     const domSelection = window.getSelection()
-    const domRange = domSelection.getRangeAt(0)
+    const domRange = domSelection!.getRangeAt(0)
     const rect = domRange.getBoundingClientRect()
     el.style.opacity = '1'
     el.style.top = `${rect.top + window.pageYOffset - el.offsetHeight}px`
@@ -120,20 +121,25 @@ const HoveringToolbar = () => {
           border-radius: 4px;
           transition: opacity 0.75s;
         `}
-        onMouseDown={e => {
+        onMouseDown={(e: MouseEvent) => {
           // prevent toolbar from taking focus away from editor
           e.preventDefault()
         }}
       >
         <FormatButton format="bold" icon="format_bold" />
         <FormatButton format="italic" icon="format_italic" />
-        <FormatButton format="underlined" icon="format_underlined" />
+        <FormatButton format="underline" icon="format_underlined" />
       </Menu>
     </Portal>
   )
 }
 
-const FormatButton = ({ format, icon }) => {
+interface FormatButtonProps {
+  format: CustomTextKey
+  icon: string
+}
+
+const FormatButton = ({ format, icon }: FormatButtonProps) => {
   const editor = useSlate()
   return (
     <Button
diff --git a/site/examples/ts/huge-document.tsx b/site/examples/ts/huge-document.tsx
index b36149f4d..2aed98ba5 100644
--- a/site/examples/ts/huge-document.tsx
+++ b/site/examples/ts/huge-document.tsx
@@ -1,29 +1,40 @@
-import React, { useMemo, useCallback } from 'react'
 import { faker } from '@faker-js/faker'
+import React, { useCallback, useMemo } from 'react'
 import { createEditor, Descendant } from 'slate'
-import { Slate, Editable, withReact } from 'slate-react'
+import { Editable, RenderElementProps, Slate, withReact } from 'slate-react'
+
+import {
+  CustomEditor,
+  HeadingElement,
+  ParagraphElement,
+} from './custom-types.d'
 
 const HEADINGS = 100
 const PARAGRAPHS = 7
 const initialValue: Descendant[] = []
 
 for (let h = 0; h < HEADINGS; h++) {
-  initialValue.push({
-    type: 'heading',
+  const heading: HeadingElement = {
+    type: 'heading-one',
     children: [{ text: faker.lorem.sentence() }],
-  })
+  }
+  initialValue.push(heading)
 
   for (let p = 0; p < PARAGRAPHS; p++) {
-    initialValue.push({
+    const paragraph: ParagraphElement = {
       type: 'paragraph',
       children: [{ text: faker.lorem.paragraph() }],
-    })
+    }
+    initialValue.push(paragraph)
   }
 }
 
 const HugeDocumentExample = () => {
-  const renderElement = useCallback(props => <Element {...props} />, [])
-  const editor = useMemo(() => withReact(createEditor()), [])
+  const renderElement = useCallback(
+    (props: RenderElementProps) => <Element {...props} />,
+    []
+  )
+  const editor = useMemo(() => withReact(createEditor()) as CustomEditor, [])
   return (
     <Slate editor={editor} initialValue={initialValue}>
       <Editable renderElement={renderElement} spellCheck autoFocus />
@@ -31,9 +42,9 @@ const HugeDocumentExample = () => {
   )
 }
 
-const Element = ({ attributes, children, element }) => {
+const Element = ({ attributes, children, element }: RenderElementProps) => {
   switch (element.type) {
-    case 'heading':
+    case 'heading-one':
       return <h1 {...attributes}>{children}</h1>
     default:
       return <p {...attributes}>{children}</p>
diff --git a/site/examples/ts/iframe.tsx b/site/examples/ts/iframe.tsx
index 2fe33ef0d..cb79b3bf9 100644
--- a/site/examples/ts/iframe.tsx
+++ b/site/examples/ts/iframe.tsx
@@ -1,13 +1,22 @@
-import React, { useCallback, useMemo, useState } from 'react'
-import { createPortal } from 'react-dom'
 import isHotkey from 'is-hotkey'
-import { Editable, withReact, useSlate, Slate, ReactEditor } from 'slate-react'
+import React, { MouseEvent, useCallback, useMemo, useState } from 'react'
+import { createPortal } from 'react-dom'
 import { Editor, createEditor, Descendant } from 'slate'
 import { withHistory } from 'slate-history'
+import {
+  Editable,
+  ReactEditor,
+  RenderElementProps,
+  RenderLeafProps,
+  Slate,
+  useSlate,
+  withReact,
+} from 'slate-react'
 
 import { Button, Icon, Toolbar } from './components'
+import { CustomEditor, CustomTextKey } from './custom-types.d'
 
-const HOTKEYS = {
+const HOTKEYS: Record<string, CustomTextKey> = {
   'mod+b': 'bold',
   'mod+i': 'italic',
   'mod+u': 'underline',
@@ -16,11 +25,19 @@ const HOTKEYS = {
 
 const IFrameExample = () => {
   const renderElement = useCallback(
-    ({ attributes, children }) => <p {...attributes}>{children}</p>,
+    ({ attributes, children }: RenderElementProps) => (
+      <p {...attributes}>{children}</p>
+    ),
+    []
+  )
+  const renderLeaf = useCallback(
+    (props: RenderLeafProps) => <Leaf {...props} />,
+    []
+  )
+  const editor = useMemo(
+    () => withHistory(withReact(createEditor())) as CustomEditor,
     []
   )
-  const renderLeaf = useCallback(props => <Leaf {...props} />, [])
-  const editor = useMemo(() => withHistory(withReact(createEditor())), [])
 
   const handleBlur = useCallback(() => ReactEditor.deselect(editor), [editor])
 
@@ -54,7 +71,7 @@ const IFrameExample = () => {
   )
 }
 
-const toggleMark = (editor, format) => {
+const toggleMark = (editor: CustomEditor, format: CustomTextKey) => {
   const isActive = isMarkActive(editor, format)
   if (isActive) {
     Editor.removeMark(editor, format)
@@ -63,12 +80,12 @@ const toggleMark = (editor, format) => {
   }
 }
 
-const isMarkActive = (editor, format) => {
+const isMarkActive = (editor: CustomEditor, format: CustomTextKey) => {
   const marks = Editor.marks(editor)
   return marks ? marks[format] === true : false
 }
 
-const Leaf = ({ attributes, children, leaf }) => {
+const Leaf = ({ attributes, children, leaf }: RenderLeafProps) => {
   if (leaf.bold) {
     children = <strong>{children}</strong>
   }
@@ -88,12 +105,17 @@ const Leaf = ({ attributes, children, leaf }) => {
   return <span {...attributes}>{children}</span>
 }
 
-const MarkButton = ({ format, icon }) => {
+interface MarkButtonProps {
+  format: CustomTextKey
+  icon: string
+}
+
+const MarkButton = ({ format, icon }: MarkButtonProps) => {
   const editor = useSlate()
   return (
     <Button
       active={isMarkActive(editor, format)}
-      onMouseDown={event => {
+      onMouseDown={(event: MouseEvent) => {
         event.preventDefault()
         toggleMark(editor, format)
       }}
@@ -103,10 +125,16 @@ const MarkButton = ({ format, icon }) => {
   )
 }
 
-const IFrame = ({ children, ...props }) => {
-  const [iframeBody, setIframeBody] = useState(null)
-  const handleLoad = e => {
-    setIframeBody(e.target.contentDocument.body)
+interface IFrameProps extends React.IframeHTMLAttributes<HTMLIFrameElement> {
+  children: React.ReactNode
+}
+
+const IFrame = ({ children, ...props }: IFrameProps) => {
+  const [iframeBody, setIframeBody] = useState<HTMLElement | null>(null)
+  const handleLoad = (e: React.SyntheticEvent<HTMLIFrameElement>) => {
+    const iframe = e.target as HTMLIFrameElement
+    if (!iframe.contentDocument) return
+    setIframeBody(iframe.contentDocument.body)
   }
   return (
     <iframe srcDoc={`<!DOCTYPE html>`} {...props} onLoad={handleLoad}>
diff --git a/site/examples/ts/images.tsx b/site/examples/ts/images.tsx
index c685d1fc5..41d84f555 100644
--- a/site/examples/ts/images.tsx
+++ b/site/examples/ts/images.tsx
@@ -1,26 +1,32 @@
-import React, { useMemo } from 'react'
-import imageExtensions from 'image-extensions'
-import isUrl from 'is-url'
-import isHotkey from 'is-hotkey'
-import { Transforms, createEditor, Descendant } from 'slate'
-import {
-  Slate,
-  Editable,
-  useSlateStatic,
-  useSelected,
-  useFocused,
-  withReact,
-  ReactEditor,
-} from 'slate-react'
-import { withHistory } from 'slate-history'
 import { css } from '@emotion/css'
+import imageExtensions from 'image-extensions'
+import isHotkey from 'is-hotkey'
+import isUrl from 'is-url'
+import React, { MouseEvent, useMemo } from 'react'
+import { Descendant, Transforms, createEditor } from 'slate'
+import { withHistory } from 'slate-history'
+import {
+  Editable,
+  ReactEditor,
+  RenderElementProps,
+  Slate,
+  useFocused,
+  useSelected,
+  useSlateStatic,
+  withReact,
+} from 'slate-react'
 
 import { Button, Icon, Toolbar } from './components'
-import { ImageElement } from './custom-types.d'
+import {
+  CustomEditor,
+  ImageElement,
+  ParagraphElement,
+  RenderElementPropsFor,
+} from './custom-types.d'
 
 const ImagesExample = () => {
   const editor = useMemo(
-    () => withImages(withHistory(withReact(createEditor()))),
+    () => withImages(withHistory(withReact(createEditor()))) as CustomEditor,
     []
   )
 
@@ -36,14 +42,14 @@ const ImagesExample = () => {
             Transforms.select(editor, [])
           }
         }}
-        renderElement={props => <Element {...props} />}
+        renderElement={(props: RenderElementProps) => <Element {...props} />}
         placeholder="Enter some text..."
       />
     </Slate>
   )
 }
 
-const withImages = editor => {
+const withImages = (editor: CustomEditor) => {
   const { insertData, isVoid } = editor
 
   editor.isVoid = element => {
@@ -55,19 +61,19 @@ const withImages = editor => {
     const { files } = data
 
     if (files && files.length > 0) {
-      for (const file of files) {
+      Array.from(files).forEach(file => {
         const reader = new FileReader()
         const [mime] = file.type.split('/')
 
         if (mime === 'image') {
           reader.addEventListener('load', () => {
             const url = reader.result
-            insertImage(editor, url)
+            insertImage(editor, url as string)
           })
 
           reader.readAsDataURL(file)
         }
-      }
+      })
     } else if (isImageUrl(text)) {
       insertImage(editor, text)
     } else {
@@ -78,17 +84,18 @@ const withImages = editor => {
   return editor
 }
 
-const insertImage = (editor, url) => {
+const insertImage = (editor: CustomEditor, url: string) => {
   const text = { text: '' }
   const image: ImageElement = { type: 'image', url, children: [text] }
   Transforms.insertNodes(editor, image)
-  Transforms.insertNodes(editor, {
+  const paragraph: ParagraphElement = {
     type: 'paragraph',
     children: [{ text: '' }],
-  })
+  }
+  Transforms.insertNodes(editor, paragraph)
 }
 
-const Element = props => {
+const Element = (props: RenderElementProps) => {
   const { attributes, children, element } = props
 
   switch (element.type) {
@@ -99,10 +106,13 @@ const Element = props => {
   }
 }
 
-const Image = ({ attributes, children, element }) => {
+const Image = ({
+  attributes,
+  children,
+  element,
+}: RenderElementPropsFor<ImageElement>) => {
   const editor = useSlateStatic()
   const path = ReactEditor.findPath(editor, element)
-
   const selected = useSelected()
   const focused = useFocused()
   return (
@@ -145,7 +155,7 @@ const InsertImageButton = () => {
   const editor = useSlateStatic()
   return (
     <Button
-      onMouseDown={event => {
+      onMouseDown={(event: MouseEvent) => {
         event.preventDefault()
         const url = window.prompt('Enter the URL of the image:')
         if (url && !isImageUrl(url)) {
@@ -160,11 +170,11 @@ const InsertImageButton = () => {
   )
 }
 
-const isImageUrl = url => {
+const isImageUrl = (url: string): boolean => {
   if (!url) return false
   if (!isUrl(url)) return false
   const ext = new URL(url).pathname.split('.').pop()
-  return imageExtensions.includes(ext)
+  return imageExtensions.includes(ext!)
 }
 
 const initialValue: Descendant[] = [
diff --git a/site/examples/ts/inlines.tsx b/site/examples/ts/inlines.tsx
index d9f5894f4..7e506a517 100644
--- a/site/examples/ts/inlines.tsx
+++ b/site/examples/ts/inlines.tsx
@@ -1,21 +1,35 @@
-import React, { useMemo } from 'react'
-import isUrl from 'is-url'
-import { isKeyHotkey } from 'is-hotkey'
 import { css } from '@emotion/css'
-import { Editable, withReact, useSlate, useSelected } from 'slate-react'
-import * as SlateReact from 'slate-react'
+import { isKeyHotkey } from 'is-hotkey'
+import isUrl from 'is-url'
+import React, { MouseEvent, useMemo } from 'react'
 import {
-  Transforms,
-  Editor,
-  Range,
   createEditor,
-  Element as SlateElement,
   Descendant,
+  Editor,
+  Element as SlateElement,
+  Range,
+  Transforms,
 } from 'slate'
 import { withHistory } from 'slate-history'
-import { LinkElement, ButtonElement } from './custom-types.d'
+import {
+  Editable,
+  RenderElementProps,
+  RenderLeafProps,
+  useSelected,
+  useSlate,
+  withReact,
+} from 'slate-react'
+import * as SlateReact from 'slate-react'
 
 import { Button, Icon, Toolbar } from './components'
+import {
+  BadgeElement,
+  ButtonElement,
+  CustomEditor,
+  CustomElement,
+  LinkElement,
+  RenderElementPropsFor,
+} from './custom-types.d'
 
 const initialValue: Descendant[] = [
   {
@@ -67,7 +81,7 @@ const initialValue: Descendant[] = [
 ]
 const InlinesExample = () => {
   const editor = useMemo(
-    () => withInlines(withHistory(withReact(createEditor()))),
+    () => withInlines(withHistory(withReact(createEditor()))) as CustomEditor,
     []
   )
 
@@ -112,17 +126,17 @@ const InlinesExample = () => {
   )
 }
 
-const withInlines = editor => {
+const withInlines = (editor: CustomEditor) => {
   const { insertData, insertText, isInline, isElementReadOnly, isSelectable } =
     editor
 
-  editor.isInline = element =>
+  editor.isInline = (element: CustomElement) =>
     ['link', 'button', 'badge'].includes(element.type) || isInline(element)
 
-  editor.isElementReadOnly = element =>
+  editor.isElementReadOnly = (element: CustomElement) =>
     element.type === 'badge' || isElementReadOnly(element)
 
-  editor.isSelectable = element =>
+  editor.isSelectable = (element: CustomElement) =>
     element.type !== 'badge' && isSelectable(element)
 
   editor.insertText = text => {
@@ -146,19 +160,19 @@ const withInlines = editor => {
   return editor
 }
 
-const insertLink = (editor, url) => {
+const insertLink = (editor: CustomEditor, url: string) => {
   if (editor.selection) {
     wrapLink(editor, url)
   }
 }
 
-const insertButton = editor => {
+const insertButton = (editor: CustomEditor) => {
   if (editor.selection) {
     wrapButton(editor)
   }
 }
 
-const isLinkActive = editor => {
+const isLinkActive = (editor: CustomEditor): boolean => {
   const [link] = Editor.nodes(editor, {
     match: n =>
       !Editor.isEditor(n) && SlateElement.isElement(n) && n.type === 'link',
@@ -166,7 +180,7 @@ const isLinkActive = editor => {
   return !!link
 }
 
-const isButtonActive = editor => {
+const isButtonActive = (editor: CustomEditor): boolean => {
   const [button] = Editor.nodes(editor, {
     match: n =>
       !Editor.isEditor(n) && SlateElement.isElement(n) && n.type === 'button',
@@ -174,21 +188,21 @@ const isButtonActive = editor => {
   return !!button
 }
 
-const unwrapLink = editor => {
+const unwrapLink = (editor: CustomEditor) => {
   Transforms.unwrapNodes(editor, {
     match: n =>
       !Editor.isEditor(n) && SlateElement.isElement(n) && n.type === 'link',
   })
 }
 
-const unwrapButton = editor => {
+const unwrapButton = (editor: CustomEditor) => {
   Transforms.unwrapNodes(editor, {
     match: n =>
       !Editor.isEditor(n) && SlateElement.isElement(n) && n.type === 'button',
   })
 }
 
-const wrapLink = (editor, url: string) => {
+const wrapLink = (editor: CustomEditor, url: string) => {
   if (isLinkActive(editor)) {
     unwrapLink(editor)
   }
@@ -209,7 +223,7 @@ const wrapLink = (editor, url: string) => {
   }
 }
 
-const wrapButton = editor => {
+const wrapButton = (editor: CustomEditor) => {
   if (isButtonActive(editor)) {
     unwrapButton(editor)
   }
@@ -244,11 +258,14 @@ const InlineChromiumBugfix = () => (
 
 const allowedSchemes = ['http:', 'https:', 'mailto:', 'tel:']
 
-const LinkComponent = ({ attributes, children, element }) => {
+const LinkComponent = ({
+  attributes,
+  children,
+  element,
+}: RenderElementPropsFor<LinkElement>) => {
   const selected = useSelected()
-
   const safeUrl = useMemo(() => {
-    let parsedUrl: URL = null
+    let parsedUrl: URL | null = null
     try {
       parsedUrl = new URL(element.url)
       // eslint-disable-next-line no-empty
@@ -278,7 +295,10 @@ const LinkComponent = ({ attributes, children, element }) => {
   )
 }
 
-const EditableButtonComponent = ({ attributes, children }) => {
+const EditableButtonComponent = ({
+  attributes,
+  children,
+}: RenderElementProps) => {
   return (
     /*
       Note that this is not a true button, but a span with button-like CSS.
@@ -310,7 +330,11 @@ const EditableButtonComponent = ({ attributes, children }) => {
   )
 }
 
-const BadgeComponent = ({ attributes, children, element }) => {
+const BadgeComponent = ({
+  attributes,
+  children,
+  element,
+}: RenderElementProps) => {
   const selected = useSelected()
 
   return (
@@ -334,7 +358,7 @@ const BadgeComponent = ({ attributes, children, element }) => {
   )
 }
 
-const Element = props => {
+const Element = (props: RenderElementProps) => {
   const { attributes, children, element } = props
   switch (element.type) {
     case 'link':
@@ -348,7 +372,7 @@ const Element = props => {
   }
 }
 
-const Text = props => {
+const Text = (props: RenderLeafProps) => {
   const { attributes, children, leaf } = props
   return (
     <span
@@ -362,7 +386,7 @@ const Text = props => {
           ? css`
               padding-left: 0.1px;
             `
-          : null
+          : undefined
       }
       {...attributes}
     >
@@ -376,7 +400,7 @@ const AddLinkButton = () => {
   return (
     <Button
       active={isLinkActive(editor)}
-      onMouseDown={event => {
+      onMouseDown={(event: MouseEvent) => {
         event.preventDefault()
         const url = window.prompt('Enter the URL of the link:')
         if (!url) return
@@ -394,7 +418,7 @@ const RemoveLinkButton = () => {
   return (
     <Button
       active={isLinkActive(editor)}
-      onMouseDown={event => {
+      onMouseDown={(event: MouseEvent) => {
         if (isLinkActive(editor)) {
           unwrapLink(editor)
         }
@@ -410,7 +434,7 @@ const ToggleEditableButtonButton = () => {
   return (
     <Button
       active
-      onMouseDown={event => {
+      onMouseDown={(event: MouseEvent) => {
         event.preventDefault()
         if (isButtonActive(editor)) {
           unwrapButton(editor)
diff --git a/site/examples/ts/markdown-preview.tsx b/site/examples/ts/markdown-preview.tsx
index 7c3604d4a..dbda4c3d4 100644
--- a/site/examples/ts/markdown-preview.tsx
+++ b/site/examples/ts/markdown-preview.tsx
@@ -1,28 +1,38 @@
+import { css } from '@emotion/css'
 import Prism from 'prismjs'
 import 'prismjs/components/prism-markdown'
 import React, { useCallback, useMemo } from 'react'
-import { Slate, Editable, withReact } from 'slate-react'
-import { Text, createEditor, Descendant } from 'slate'
+import { Descendant, NodeEntry, Range, Text, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
-import { css } from '@emotion/css'
+import { Editable, RenderLeafProps, Slate, withReact } from 'slate-react'
+import { CustomEditor } from './custom-types.d'
 
 const MarkdownPreviewExample = () => {
-  const renderLeaf = useCallback(props => <Leaf {...props} />, [])
-  const editor = useMemo(() => withHistory(withReact(createEditor())), [])
-  const decorate = useCallback(([node, path]) => {
-    const ranges = []
+  const renderLeaf = useCallback(
+    (props: RenderLeafProps) => <Leaf {...props} />,
+    []
+  )
+  const editor = useMemo(
+    () => withHistory(withReact(createEditor())) as CustomEditor,
+    []
+  )
+  const decorate = useCallback(([node, path]: NodeEntry) => {
+    const ranges: Range[] = []
 
     if (!Text.isText(node)) {
       return ranges
     }
 
-    const getLength = token => {
+    const getLength = (token: string | Prism.Token): number => {
       if (typeof token === 'string') {
         return token.length
       } else if (typeof token.content === 'string') {
         return token.content.length
       } else {
-        return token.content.reduce((l, t) => l + getLength(t), 0)
+        return (token.content as Prism.Token[]).reduce(
+          (l, t) => l + getLength(t),
+          0
+        )
       }
     }
 
@@ -58,7 +68,7 @@ const MarkdownPreviewExample = () => {
   )
 }
 
-const Leaf = ({ attributes, children, leaf }) => {
+const Leaf = ({ attributes, children, leaf }: RenderLeafProps) => {
   return (
     <span
       {...attributes}
diff --git a/site/examples/ts/markdown-shortcuts.tsx b/site/examples/ts/markdown-shortcuts.tsx
index 4c1c69395..23cc77f0b 100644
--- a/site/examples/ts/markdown-shortcuts.tsx
+++ b/site/examples/ts/markdown-shortcuts.tsx
@@ -10,10 +10,21 @@ import {
   Transforms,
 } from 'slate'
 import { withHistory } from 'slate-history'
-import { Editable, ReactEditor, Slate, withReact } from 'slate-react'
-import { BulletedListElement } from './custom-types.d'
+import {
+  Editable,
+  ReactEditor,
+  RenderElementProps,
+  Slate,
+  withReact,
+} from 'slate-react'
 
-const SHORTCUTS = {
+import {
+  BulletedListElement,
+  CustomEditor,
+  CustomElementType,
+} from './custom-types.d'
+
+const SHORTCUTS: Record<string, CustomElementType> = {
   '*': 'list-item',
   '-': 'list-item',
   '+': 'list-item',
@@ -24,12 +35,15 @@ const SHORTCUTS = {
   '####': 'heading-four',
   '#####': 'heading-five',
   '######': 'heading-six',
-}
+} as const
 
 const MarkdownShortcutsExample = () => {
-  const renderElement = useCallback(props => <Element {...props} />, [])
+  const renderElement = useCallback(
+    (props: RenderElementProps) => <Element {...props} />,
+    []
+  )
   const editor = useMemo(
-    () => withShortcuts(withReact(withHistory(createEditor()))),
+    () => withShortcuts(withReact(withHistory(createEditor()))) as CustomEditor,
     []
   )
 
@@ -82,7 +96,7 @@ const MarkdownShortcutsExample = () => {
   )
 }
 
-const withShortcuts = editor => {
+const withShortcuts = (editor: CustomEditor) => {
   const { deleteBackward, insertText } = editor
 
   editor.insertText = text => {
@@ -177,7 +191,7 @@ const withShortcuts = editor => {
   return editor
 }
 
-const Element = ({ attributes, children, element }) => {
+const Element = ({ attributes, children, element }: RenderElementProps) => {
   switch (element.type) {
     case 'block-quote':
       return <blockquote {...attributes}>{children}</blockquote>
diff --git a/site/examples/ts/mentions.tsx b/site/examples/ts/mentions.tsx
index 74d81f4a6..0feb46ac0 100644
--- a/site/examples/ts/mentions.tsx
+++ b/site/examples/ts/mentions.tsx
@@ -1,35 +1,56 @@
 import React, {
-  useMemo,
-  useCallback,
-  useRef,
-  useEffect,
-  useState,
   Fragment,
+  KeyboardEvent,
+  MouseEvent,
+  useCallback,
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
 } from 'react'
-import { Editor, Transforms, Range, createEditor, Descendant } from 'slate'
+import {
+  Editor,
+  Transforms,
+  Range,
+  createEditor,
+  Descendant,
+  Element as SlateElement,
+} from 'slate'
 import { withHistory } from 'slate-history'
 import {
-  Slate,
   Editable,
   ReactEditor,
-  withReact,
-  useSelected,
+  RenderElementProps,
+  RenderLeafProps,
+  Slate,
   useFocused,
+  useSelected,
+  withReact,
 } from 'slate-react'
 
 import { Portal } from './components'
-import { MentionElement } from './custom-types.d'
+import {
+  CustomEditor,
+  MentionElement,
+  RenderElementPropsFor,
+} from './custom-types.d'
 import { IS_MAC } from './utils/environment'
 
 const MentionExample = () => {
-  const ref = useRef<HTMLDivElement | null>()
-  const [target, setTarget] = useState<Range | undefined>()
+  const ref = useRef<HTMLDivElement | null>(null)
+  const [target, setTarget] = useState<Range | null>(null)
   const [index, setIndex] = useState(0)
   const [search, setSearch] = useState('')
-  const renderElement = useCallback(props => <Element {...props} />, [])
-  const renderLeaf = useCallback(props => <Leaf {...props} />, [])
+  const renderElement = useCallback(
+    (props: RenderElementProps) => <Element {...props} />,
+    []
+  )
+  const renderLeaf = useCallback(
+    (props: RenderLeafProps) => <Leaf {...props} />,
+    []
+  )
   const editor = useMemo(
-    () => withMentions(withReact(withHistory(createEditor()))),
+    () => withMentions(withReact(withHistory(createEditor()))) as CustomEditor,
     []
   )
 
@@ -38,7 +59,7 @@ const MentionExample = () => {
   ).slice(0, 10)
 
   const onKeyDown = useCallback(
-    event => {
+    (event: KeyboardEvent<HTMLDivElement>) => {
       if (target && chars.length > 0) {
         switch (event.key) {
           case 'ArrowDown':
@@ -69,7 +90,7 @@ const MentionExample = () => {
   )
 
   useEffect(() => {
-    if (target && chars.length > 0) {
+    if (target && chars.length > 0 && ref.current) {
       const el = ref.current
       const domRange = ReactEditor.toDOMRange(editor, target)
       const rect = domRange.getBoundingClientRect()
@@ -133,7 +154,7 @@ const MentionExample = () => {
             {chars.map((char, i) => (
               <div
                 key={char}
-                onClick={() => {
+                onClick={(e: MouseEvent) => {
                   Transforms.select(editor, target)
                   insertMention(editor, char)
                   setTarget(null)
@@ -155,25 +176,25 @@ const MentionExample = () => {
   )
 }
 
-const withMentions = editor => {
+const withMentions = (editor: CustomEditor) => {
   const { isInline, isVoid, markableVoid } = editor
 
-  editor.isInline = element => {
+  editor.isInline = (element: SlateElement) => {
     return element.type === 'mention' ? true : isInline(element)
   }
 
-  editor.isVoid = element => {
+  editor.isVoid = (element: SlateElement) => {
     return element.type === 'mention' ? true : isVoid(element)
   }
 
-  editor.markableVoid = element => {
+  editor.markableVoid = (element: SlateElement) => {
     return element.type === 'mention' || markableVoid(element)
   }
 
   return editor
 }
 
-const insertMention = (editor, character) => {
+const insertMention = (editor: CustomEditor, character: string) => {
   const mention: MentionElement = {
     type: 'mention',
     character,
@@ -185,7 +206,7 @@ const insertMention = (editor, character) => {
 
 // Borrow Leaf renderer from the Rich Text example.
 // In a real project you would get this via `withRichText(editor)` or similar.
-const Leaf = ({ attributes, children, leaf }) => {
+const Leaf = ({ attributes, children, leaf }: RenderLeafProps) => {
   if (leaf.bold) {
     children = <strong>{children}</strong>
   }
@@ -205,7 +226,7 @@ const Leaf = ({ attributes, children, leaf }) => {
   return <span {...attributes}>{children}</span>
 }
 
-const Element = props => {
+const Element = (props: RenderElementProps) => {
   const { attributes, children, element } = props
   switch (element.type) {
     case 'mention':
@@ -215,7 +236,11 @@ const Element = props => {
   }
 }
 
-const Mention = ({ attributes, children, element }) => {
+const Mention = ({
+  attributes,
+  children,
+  element,
+}: RenderElementPropsFor<MentionElement>) => {
   const selected = useSelected()
   const focused = useFocused()
   const style: React.CSSProperties = {
diff --git a/site/examples/ts/paste-html.tsx b/site/examples/ts/paste-html.tsx
index e7d058f51..287e58736 100644
--- a/site/examples/ts/paste-html.tsx
+++ b/site/examples/ts/paste-html.tsx
@@ -1,35 +1,58 @@
-import React, { useCallback, useMemo } from 'react'
-import { jsx } from 'slate-hyperscript'
-import { Transforms, createEditor, Descendant } from 'slate'
-import { withHistory } from 'slate-history'
 import { css } from '@emotion/css'
+import React, { useCallback, useMemo } from 'react'
+import { Descendant, Transforms, createEditor } from 'slate'
+import { withHistory } from 'slate-history'
+import { jsx } from 'slate-hyperscript'
 import {
-  Slate,
   Editable,
-  withReact,
-  useSelected,
+  RenderElementProps,
+  RenderLeafProps,
+  Slate,
   useFocused,
+  useSelected,
+  withReact,
 } from 'slate-react'
 
-const ELEMENT_TAGS = {
-  A: el => ({ type: 'link', url: el.getAttribute('href') }),
-  BLOCKQUOTE: () => ({ type: 'quote' }),
+import {
+  CustomEditor,
+  CustomElement,
+  CustomElementType,
+  ImageElement as ImageElementType,
+  RenderElementPropsFor,
+} from './custom-types.d'
+
+interface ElementAttributes {
+  type: CustomElementType
+  url?: string
+}
+
+const ELEMENT_TAGS: Record<string, (el: HTMLElement) => ElementAttributes> = {
+  A: el => ({ type: 'link', url: el.getAttribute('href')! }),
+  BLOCKQUOTE: () => ({ type: 'block-quote' }),
   H1: () => ({ type: 'heading-one' }),
   H2: () => ({ type: 'heading-two' }),
   H3: () => ({ type: 'heading-three' }),
   H4: () => ({ type: 'heading-four' }),
   H5: () => ({ type: 'heading-five' }),
   H6: () => ({ type: 'heading-six' }),
-  IMG: el => ({ type: 'image', url: el.getAttribute('src') }),
+  IMG: el => ({ type: 'image', url: el.getAttribute('src')! }),
   LI: () => ({ type: 'list-item' }),
   OL: () => ({ type: 'numbered-list' }),
   P: () => ({ type: 'paragraph' }),
-  PRE: () => ({ type: 'code' }),
+  PRE: () => ({ type: 'code-block' }),
   UL: () => ({ type: 'bulleted-list' }),
 }
 
 // COMPAT: `B` is omitted here because Google Docs uses `<b>` in weird ways.
-const TEXT_TAGS = {
+interface TextAttributes {
+  code?: boolean
+  strikethrough?: boolean
+  italic?: boolean
+  bold?: boolean
+  underline?: boolean
+}
+
+const TEXT_TAGS: Record<string, () => TextAttributes> = {
   CODE: () => ({ code: true }),
   DEL: () => ({ strikethrough: true }),
   EM: () => ({ italic: true }),
@@ -39,7 +62,7 @@ const TEXT_TAGS = {
   U: () => ({ underline: true }),
 }
 
-export const deserialize = el => {
+export const deserialize = (el: HTMLElement | ChildNode): any => {
   if (el.nodeType === 3) {
     return el.textContent
   } else if (el.nodeType !== 1) {
@@ -69,12 +92,12 @@ export const deserialize = el => {
   }
 
   if (ELEMENT_TAGS[nodeName]) {
-    const attrs = ELEMENT_TAGS[nodeName](el)
+    const attrs = ELEMENT_TAGS[nodeName](el as HTMLElement)
     return jsx('element', attrs, children)
   }
 
   if (TEXT_TAGS[nodeName]) {
-    const attrs = TEXT_TAGS[nodeName](el)
+    const attrs = TEXT_TAGS[nodeName]()
     return children.map(child => jsx('text', attrs, child))
   }
 
@@ -82,10 +105,16 @@ export const deserialize = el => {
 }
 
 const PasteHtmlExample = () => {
-  const renderElement = useCallback(props => <Element {...props} />, [])
-  const renderLeaf = useCallback(props => <Leaf {...props} />, [])
+  const renderElement = useCallback(
+    (props: RenderElementProps) => <Element {...props} />,
+    []
+  )
+  const renderLeaf = useCallback(
+    (props: RenderLeafProps) => <Leaf {...props} />,
+    []
+  )
   const editor = useMemo(
-    () => withHtml(withReact(withHistory(createEditor()))),
+    () => withHtml(withReact(withHistory(createEditor()))) as CustomEditor,
     []
   )
   return (
@@ -99,14 +128,14 @@ const PasteHtmlExample = () => {
   )
 }
 
-const withHtml = editor => {
+const withHtml = (editor: CustomEditor) => {
   const { insertData, isInline, isVoid } = editor
 
-  editor.isInline = element => {
+  editor.isInline = (element: CustomElement) => {
     return element.type === 'link' ? true : isInline(element)
   }
 
-  editor.isVoid = element => {
+  editor.isVoid = (element: CustomElement) => {
     return element.type === 'image' ? true : isVoid(element)
   }
 
@@ -126,15 +155,15 @@ const withHtml = editor => {
   return editor
 }
 
-const Element = props => {
+const Element = (props: RenderElementProps) => {
   const { attributes, children, element } = props
 
   switch (element.type) {
     default:
       return <p {...attributes}>{children}</p>
-    case 'quote':
+    case 'block-quote':
       return <blockquote {...attributes}>{children}</blockquote>
-    case 'code':
+    case 'code-block':
       return (
         <pre>
           <code {...attributes}>{children}</code>
@@ -160,7 +189,7 @@ const Element = props => {
       return <ol {...attributes}>{children}</ol>
     case 'link':
       return (
-        <SafeLink href={element.url} {...attributes}>
+        <SafeLink href={element.url} attributes={attributes}>
           {children}
         </SafeLink>
       )
@@ -171,9 +200,15 @@ const Element = props => {
 
 const allowedSchemes = ['http:', 'https:', 'mailto:', 'tel:']
 
-const SafeLink = ({ attributes, children, href }) => {
+interface SafeLinkProps {
+  attributes: Record<string, unknown>
+  children: React.ReactNode
+  href: string
+}
+
+const SafeLink = ({ children, href, attributes }: SafeLinkProps) => {
   const safeHref = useMemo(() => {
-    let parsedUrl: URL = null
+    let parsedUrl: URL | null = null
     try {
       parsedUrl = new URL(href)
       // eslint-disable-next-line no-empty
@@ -191,7 +226,11 @@ const SafeLink = ({ attributes, children, href }) => {
   )
 }
 
-const ImageElement = ({ attributes, children, element }) => {
+const ImageElement = ({
+  attributes,
+  children,
+  element,
+}: RenderElementPropsFor<ImageElementType>) => {
   const selected = useSelected()
   const focused = useFocused()
   return (
@@ -210,7 +249,7 @@ const ImageElement = ({ attributes, children, element }) => {
   )
 }
 
-const Leaf = ({ attributes, children, leaf }) => {
+const Leaf = ({ attributes, children, leaf }: RenderLeafProps) => {
   if (leaf.bold) {
     children = <strong>{children}</strong>
   }
diff --git a/site/examples/ts/richtext.tsx b/site/examples/ts/richtext.tsx
index dbd20bb76..b9700807f 100644
--- a/site/examples/ts/richtext.tsx
+++ b/site/examples/ts/richtext.tsx
@@ -1,30 +1,53 @@
-import React, { useCallback, useMemo } from 'react'
 import isHotkey from 'is-hotkey'
-import { Editable, withReact, useSlate, Slate } from 'slate-react'
+import React, { KeyboardEvent, MouseEvent, useCallback, useMemo } from 'react'
 import {
+  Descendant,
   Editor,
+  Element as SlateElement,
   Transforms,
   createEditor,
-  Descendant,
-  Element as SlateElement,
 } from 'slate'
 import { withHistory } from 'slate-history'
-
+import {
+  Editable,
+  RenderElementProps,
+  RenderLeafProps,
+  Slate,
+  useSlate,
+  withReact,
+} from 'slate-react'
 import { Button, Icon, Toolbar } from './components'
+import {
+  CustomEditor,
+  CustomElement,
+  CustomElementType,
+  CustomElementWithAlign,
+  CustomTextKey,
+} from './custom-types.d'
 
-const HOTKEYS = {
+const HOTKEYS: Record<string, CustomTextKey> = {
   'mod+b': 'bold',
   'mod+i': 'italic',
   'mod+u': 'underline',
   'mod+`': 'code',
 }
 
-const LIST_TYPES = ['numbered-list', 'bulleted-list']
-const TEXT_ALIGN_TYPES = ['left', 'center', 'right', 'justify']
+const LIST_TYPES = ['numbered-list', 'bulleted-list'] as const
+const TEXT_ALIGN_TYPES = ['left', 'center', 'right', 'justify'] as const
+
+type AlignType = (typeof TEXT_ALIGN_TYPES)[number]
+type ListType = (typeof LIST_TYPES)[number]
+type CustomElementFormat = CustomElementType | AlignType | ListType
 
 const RichTextExample = () => {
-  const renderElement = useCallback(props => <Element {...props} />, [])
-  const renderLeaf = useCallback(props => <Leaf {...props} />, [])
+  const renderElement = useCallback(
+    (props: RenderElementProps) => <Element {...props} />,
+    []
+  )
+  const renderLeaf = useCallback(
+    (props: RenderLeafProps) => <Leaf {...props} />,
+    []
+  )
   const editor = useMemo(() => withHistory(withReact(createEditor())), [])
 
   return (
@@ -50,7 +73,7 @@ const RichTextExample = () => {
         placeholder="Enter some rich text…"
         spellCheck
         autoFocus
-        onKeyDown={event => {
+        onKeyDown={(event: KeyboardEvent<HTMLDivElement>) => {
           for (const hotkey in HOTKEYS) {
             if (isHotkey(hotkey, event as any)) {
               event.preventDefault()
@@ -64,24 +87,24 @@ const RichTextExample = () => {
   )
 }
 
-const toggleBlock = (editor, format) => {
+const toggleBlock = (editor: CustomEditor, format: CustomElementFormat) => {
   const isActive = isBlockActive(
     editor,
     format,
-    TEXT_ALIGN_TYPES.includes(format) ? 'align' : 'type'
+    isAlignType(format) ? 'align' : 'type'
   )
-  const isList = LIST_TYPES.includes(format)
+  const isList = isListType(format)
 
   Transforms.unwrapNodes(editor, {
     match: n =>
       !Editor.isEditor(n) &&
       SlateElement.isElement(n) &&
-      LIST_TYPES.includes(n.type) &&
-      !TEXT_ALIGN_TYPES.includes(format),
+      isListType(n.type) &&
+      !isAlignType(format),
     split: true,
   })
   let newProperties: Partial<SlateElement>
-  if (TEXT_ALIGN_TYPES.includes(format)) {
+  if (isAlignType(format)) {
     newProperties = {
       align: isActive ? undefined : format,
     }
@@ -98,7 +121,7 @@ const toggleBlock = (editor, format) => {
   }
 }
 
-const toggleMark = (editor, format) => {
+const toggleMark = (editor: CustomEditor, format: CustomTextKey) => {
   const isActive = isMarkActive(editor, format)
 
   if (isActive) {
@@ -108,30 +131,42 @@ const toggleMark = (editor, format) => {
   }
 }
 
-const isBlockActive = (editor, format, blockType = 'type') => {
+const isBlockActive = (
+  editor: CustomEditor,
+  format: CustomElementFormat,
+  blockType: 'type' | 'align' = 'type'
+) => {
   const { selection } = editor
   if (!selection) return false
 
   const [match] = Array.from(
     Editor.nodes(editor, {
       at: Editor.unhangRange(editor, selection),
-      match: n =>
-        !Editor.isEditor(n) &&
-        SlateElement.isElement(n) &&
-        n[blockType] === format,
+      match: n => {
+        if (!Editor.isEditor(n) && SlateElement.isElement(n)) {
+          if (blockType === 'align' && isAlignElement(n)) {
+            return n.align === format
+          }
+          return n.type === format
+        }
+        return false
+      },
     })
   )
 
   return !!match
 }
 
-const isMarkActive = (editor, format) => {
+const isMarkActive = (editor: CustomEditor, format: CustomTextKey) => {
   const marks = Editor.marks(editor)
   return marks ? marks[format] === true : false
 }
 
-const Element = ({ attributes, children, element }) => {
-  const style = { textAlign: element.align }
+const Element = ({ attributes, children, element }: RenderElementProps) => {
+  const style: React.CSSProperties = {}
+  if (isAlignElement(element)) {
+    style.textAlign = element.align as AlignType
+  }
   switch (element.type) {
     case 'block-quote':
       return (
@@ -178,7 +213,7 @@ const Element = ({ attributes, children, element }) => {
   }
 }
 
-const Leaf = ({ attributes, children, leaf }) => {
+const Leaf = ({ attributes, children, leaf }: RenderLeafProps) => {
   if (leaf.bold) {
     children = <strong>{children}</strong>
   }
@@ -198,16 +233,21 @@ const Leaf = ({ attributes, children, leaf }) => {
   return <span {...attributes}>{children}</span>
 }
 
-const BlockButton = ({ format, icon }) => {
+interface BlockButtonProps {
+  format: CustomElementFormat
+  icon: string
+}
+
+const BlockButton = ({ format, icon }: BlockButtonProps) => {
   const editor = useSlate()
   return (
     <Button
       active={isBlockActive(
         editor,
         format,
-        TEXT_ALIGN_TYPES.includes(format) ? 'align' : 'type'
+        isAlignType(format) ? 'align' : 'type'
       )}
-      onMouseDown={event => {
+      onMouseDown={(event: MouseEvent<HTMLSpanElement>) => {
         event.preventDefault()
         toggleBlock(editor, format)
       }}
@@ -217,12 +257,17 @@ const BlockButton = ({ format, icon }) => {
   )
 }
 
-const MarkButton = ({ format, icon }) => {
+interface MarkButtonProps {
+  format: CustomTextKey
+  icon: string
+}
+
+const MarkButton = ({ format, icon }: MarkButtonProps) => {
   const editor = useSlate()
   return (
     <Button
       active={isMarkActive(editor, format)}
-      onMouseDown={event => {
+      onMouseDown={(event: MouseEvent<HTMLSpanElement>) => {
         event.preventDefault()
         toggleMark(editor, format)
       }}
@@ -232,6 +277,20 @@ const MarkButton = ({ format, icon }) => {
   )
 }
 
+const isAlignType = (format: CustomElementFormat): format is AlignType => {
+  return TEXT_ALIGN_TYPES.includes(format as AlignType)
+}
+
+const isListType = (format: CustomElementFormat): format is ListType => {
+  return LIST_TYPES.includes(format as ListType)
+}
+
+const isAlignElement = (
+  element: CustomElement
+): element is CustomElementWithAlign => {
+  return 'align' in element
+}
+
 const initialValue: Descendant[] = [
   {
     type: 'paragraph',
diff --git a/site/examples/ts/search-highlighting.tsx b/site/examples/ts/search-highlighting.tsx
index 6ec92d5e2..bb17da99c 100644
--- a/site/examples/ts/search-highlighting.tsx
+++ b/site/examples/ts/search-highlighting.tsx
@@ -1,20 +1,31 @@
-import React, { useState, useCallback, useMemo } from 'react'
-import { Slate, Editable, withReact } from 'slate-react'
-import { Text, Descendant, createEditor } from 'slate'
 import { css } from '@emotion/css'
+import React, { useCallback, useMemo, useState } from 'react'
+import {
+  Descendant,
+  Element,
+  NodeEntry,
+  Range,
+  Text,
+  createEditor,
+} from 'slate'
 import { withHistory } from 'slate-history'
+import { Editable, RenderLeafProps, Slate, withReact } from 'slate-react'
 
 import { Icon, Toolbar } from './components'
+import { CustomEditor, CustomText } from './custom-types.d'
 
 const SearchHighlightingExample = () => {
-  const [search, setSearch] = useState<string | undefined>()
-  const editor = useMemo(() => withHistory(withReact(createEditor())), [])
+  const [search, setSearch] = useState<string>('')
+  const editor = useMemo(
+    () => withHistory(withReact(createEditor())) as CustomEditor,
+    []
+  )
   const decorate = useCallback(
-    ([node, path]) => {
-      const ranges = []
-
+    ([node, path]: NodeEntry) => {
+      const ranges: Range[] = []
       if (
         search &&
+        Element.isElement(node) &&
         Array.isArray(node.children) &&
         node.children.every(Text.isText)
       ) {
@@ -92,19 +103,27 @@ const SearchHighlightingExample = () => {
           />
         </div>
       </Toolbar>
-      <Editable decorate={decorate} renderLeaf={props => <Leaf {...props} />} />
+      <Editable
+        decorate={decorate}
+        renderLeaf={(props: RenderLeafProps) => <Leaf {...props} />}
+      />
     </Slate>
   )
 }
 
-const Leaf = ({ attributes, children, leaf }) => {
+interface HighlightLeaf extends CustomText {
+  highlight?: boolean
+}
+
+const Leaf = ({ attributes, children, leaf }: RenderLeafProps) => {
+  const highlightLeaf = leaf as HighlightLeaf
   return (
     <span
       {...attributes}
-      {...(leaf.highlight && { 'data-cy': 'search-highlighted' })}
+      {...(highlightLeaf.highlight && { 'data-cy': 'search-highlighted' })}
       className={css`
-        font-weight: ${leaf.bold && 'bold'};
-        background-color: ${leaf.highlight && '#ffeeba'};
+        font-weight: ${highlightLeaf.bold && 'bold'};
+        background-color: ${highlightLeaf.highlight && '#ffeeba'};
       `}
     >
       {children}
diff --git a/site/examples/ts/tables.tsx b/site/examples/ts/tables.tsx
index c49109acb..75458ab2c 100644
--- a/site/examples/ts/tables.tsx
+++ b/site/examples/ts/tables.tsx
@@ -1,20 +1,33 @@
 import React, { useCallback, useMemo } from 'react'
-import { Slate, Editable, withReact } from 'slate-react'
 import {
-  Editor,
-  Range,
-  Point,
   Descendant,
-  createEditor,
+  Editor,
+  Point,
+  Range,
   Element as SlateElement,
+  createEditor,
 } from 'slate'
 import { withHistory } from 'slate-history'
+import {
+  Editable,
+  RenderElementProps,
+  RenderLeafProps,
+  Slate,
+  withReact,
+} from 'slate-react'
+import { CustomEditor } from './custom-types.d'
 
 const TablesExample = () => {
-  const renderElement = useCallback(props => <Element {...props} />, [])
-  const renderLeaf = useCallback(props => <Leaf {...props} />, [])
+  const renderElement = useCallback(
+    (props: RenderElementProps) => <Element {...props} />,
+    []
+  )
+  const renderLeaf = useCallback(
+    (props: RenderLeafProps) => <Leaf {...props} />,
+    []
+  )
   const editor = useMemo(
-    () => withTables(withHistory(withReact(createEditor()))),
+    () => withTables(withHistory(withReact(createEditor()))) as CustomEditor,
     []
   )
   return (
@@ -24,10 +37,10 @@ const TablesExample = () => {
   )
 }
 
-const withTables = editor => {
+const withTables = (editor: CustomEditor) => {
   const { deleteBackward, deleteForward, insertBreak } = editor
 
-  editor.deleteBackward = unit => {
+  editor.deleteBackward = (unit: 'character' | 'word' | 'line' | 'block') => {
     const { selection } = editor
 
     if (selection && Range.isCollapsed(selection)) {
@@ -97,7 +110,7 @@ const withTables = editor => {
   return editor
 }
 
-const Element = ({ attributes, children, element }) => {
+const Element = ({ attributes, children, element }: RenderElementProps) => {
   switch (element.type) {
     case 'table':
       return (
@@ -114,7 +127,7 @@ const Element = ({ attributes, children, element }) => {
   }
 }
 
-const Leaf = ({ attributes, children, leaf }) => {
+const Leaf = ({ attributes, children, leaf }: RenderLeafProps) => {
   if (leaf.bold) {
     children = <strong>{children}</strong>
   }
diff --git a/site/examples/ts/utils/normalize-tokens.ts b/site/examples/ts/utils/normalize-tokens.ts
index fe2537bcd..dc6d090bb 100644
--- a/site/examples/ts/utils/normalize-tokens.ts
+++ b/site/examples/ts/utils/normalize-tokens.ts
@@ -53,7 +53,7 @@ export const normalizeTokens = (
 
   let i = 0
   let stackIndex = 0
-  let currentLine = []
+  let currentLine: Token[] = []
 
   const acc = [currentLine]
 
@@ -84,7 +84,7 @@ export const normalizeTokens = (
       if (typeof content !== 'string') {
         stackIndex++
         typeArrStack.push(types)
-        tokenArrStack.push(content)
+        tokenArrStack.push(content as PrismToken[])
         tokenArrIndexStack.push(0)
         tokenArrSizeStack.push(content.length)
         continue
diff --git a/site/pages/examples/[example].tsx b/site/pages/examples/[example].tsx
index 0fd58ffeb..fbc7b0b44 100644
--- a/site/pages/examples/[example].tsx
+++ b/site/pages/examples/[example].tsx
@@ -33,7 +33,9 @@ import CustomPlaceholder from '../../examples/ts/custom-placeholder'
 // node
 import { getAllExamples } from '../api'
 
-const EXAMPLES = [
+type ExampleTuple = [string, React.ComponentType, string]
+
+const EXAMPLES: ExampleTuple[] = [
   ['Checklists', CheckLists, 'check-lists'],
   ['Editable Voids', EditableVoids, 'editable-voids'],
   ['Embeds', Embeds, 'embeds'],
@@ -58,7 +60,7 @@ const EXAMPLES = [
   ['Custom placeholder', CustomPlaceholder, 'custom-placeholder'],
 ]
 
-const Header = props => (
+const Header = (props: React.HTMLAttributes<HTMLDivElement>) => (
   <div
     {...props}
     className={css`
@@ -73,7 +75,7 @@ const Header = props => (
   />
 )
 
-const Title = props => (
+const Title = (props: React.HTMLAttributes<HTMLSpanElement>) => (
   <span
     {...props}
     className={css`
@@ -82,7 +84,7 @@ const Title = props => (
   />
 )
 
-const LinkList = props => (
+const LinkList = (props: React.HTMLAttributes<HTMLDivElement>) => (
   <div
     {...props}
     className={css`
@@ -92,7 +94,7 @@ const LinkList = props => (
   />
 )
 
-const A = props => (
+const A = (props: React.AnchorHTMLAttributes<HTMLAnchorElement>) => (
   <a
     {...props}
     className={css`
@@ -108,7 +110,7 @@ const A = props => (
   />
 )
 
-const Pill = props => (
+const Pill = (props: React.HTMLAttributes<HTMLSpanElement>) => (
   <span
     {...props}
     className={css`
@@ -120,7 +122,10 @@ const Pill = props => (
   />
 )
 
-const TabList = ({ isVisible, ...props }) => (
+const TabList = ({
+  isVisible,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement> & { isVisible?: boolean }) => (
   <div
     {...props}
     className={css`
@@ -139,7 +144,10 @@ const TabList = ({ isVisible, ...props }) => (
   />
 )
 
-const TabListUnderlay = ({ isVisible, ...props }) => (
+const TabListUnderlay = ({
+  isVisible,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement> & { isVisible?: boolean }) => (
   <div
     {...props}
     className={css`
@@ -153,7 +161,7 @@ const TabListUnderlay = ({ isVisible, ...props }) => (
   />
 )
 
-const TabButton = props => (
+const TabButton = (props: React.HTMLAttributes<HTMLSpanElement>) => (
   <span
     {...props}
     className={css`
@@ -182,7 +190,7 @@ const Tab = React.forwardRef(
       href: string
       [key: string]: unknown
     }>,
-    ref: Ref<HTMLAnchorElement | null>
+    ref: Ref<HTMLAnchorElement>
   ) => (
     <a
       ref={ref}
@@ -205,7 +213,10 @@ const Tab = React.forwardRef(
   )
 )
 
-const Wrapper = ({ className, ...props }) => (
+const Wrapper = ({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) => (
   <div
     {...props}
     className={cx(
@@ -219,7 +230,7 @@ const Wrapper = ({ className, ...props }) => (
   />
 )
 
-const ExampleHeader = props => (
+const ExampleHeader = (props: React.HTMLAttributes<HTMLDivElement>) => (
   <div
     {...props}
     className={css`
@@ -234,7 +245,7 @@ const ExampleHeader = props => (
   />
 )
 
-const ExampleTitle = props => (
+const ExampleTitle = (props: React.HTMLAttributes<HTMLSpanElement>) => (
   <span
     {...props}
     className={css`
@@ -243,7 +254,7 @@ const ExampleTitle = props => (
   />
 )
 
-const ExampleContent = props => (
+const ExampleContent = (props: React.HTMLAttributes<HTMLDivElement>) => (
   <Wrapper
     {...props}
     className={css`
@@ -252,7 +263,7 @@ const ExampleContent = props => (
   />
 )
 
-const Warning = props => (
+const Warning = (props: React.HTMLAttributes<HTMLDivElement>) => (
   <Wrapper
     {...props}
     className={css`
@@ -269,11 +280,11 @@ const Warning = props => (
 )
 
 const ExamplePage = ({ example }: { example: string }) => {
-  const [error, setError] = useState<Error | undefined>()
-  const [stacktrace, setStacktrace] = useState<ErrorInfo | undefined>()
-  const [showTabs, setShowTabs] = useState<boolean>()
+  const [error, setError] = useState<Error | undefined>(undefined)
+  const [stacktrace, setStacktrace] = useState<ErrorInfo | undefined>(undefined)
+  const [showTabs, setShowTabs] = useState<boolean>(false)
   const EXAMPLE = EXAMPLES.find(e => e[2] === example)
-  const [name, Component, path] = EXAMPLE
+  const [name, Component, path] = EXAMPLE!
   return (
     <ErrorBoundary
       onError={(error, stacktrace) => {
diff --git a/site/tsconfig.json b/site/tsconfig.json
index 470619925..61e4dafd2 100644
--- a/site/tsconfig.json
+++ b/site/tsconfig.json
@@ -4,7 +4,7 @@
     "lib": ["dom", "dom.iterable", "esnext"],
     "allowJs": true,
     "skipLibCheck": true,
-    "strict": false,
+    "strict": true,
     "downlevelIteration": true,
     "forceConsistentCasingInFileNames": true,
     "noEmit": true,
diff --git a/yarn.lock b/yarn.lock
index cab13bdb2..025d23085 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3357,6 +3357,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/is-hotkey@npm:^0.1.10":
+  version: 0.1.10
+  resolution: "@types/is-hotkey@npm:0.1.10"
+  checksum: 9ecc49fb3822b3cfa8335132d54c6e577d0b14bb52d0bf1f817cdd19c442555b7523945e2ae72f6098e3c7f64b4777390f38afec3e4660343cfb471377e7fd82
+  languageName: node
+  linkType: hard
+
 "@types/is-hotkey@npm:^0.1.8":
   version: 0.1.8
   resolution: "@types/is-hotkey@npm:0.1.8"
@@ -3364,6 +3371,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/is-url@npm:^1.2.32":
+  version: 1.2.32
+  resolution: "@types/is-url@npm:1.2.32"
+  checksum: f76697c868680b3be88d7f18f9724a334c62a8dc1b0f40fad8dc725b2072ad74f38d50b4ce902c07a65bb081ae2782baf06f5b3334c64bd2679c35e0a12042c5
+  languageName: node
+  linkType: hard
+
 "@types/istanbul-lib-coverage@npm:*, @types/istanbul-lib-coverage@npm:^2.0.0, @types/istanbul-lib-coverage@npm:^2.0.1":
   version: 2.0.3
   resolution: "@types/istanbul-lib-coverage@npm:2.0.3"
@@ -13333,6 +13347,8 @@ __metadata:
     "@emotion/css": "npm:^11.11.2"
     "@faker-js/faker": "npm:^8.2.0"
     "@playwright/test": "npm:^1.39.0"
+    "@types/is-hotkey": "npm:^0.1.10"
+    "@types/is-url": "npm:^1.2.32"
     "@types/jest": "npm:29.5.6"
     "@types/lodash": "npm:^4.14.200"
     "@types/mocha": "npm:^10.0.3"