add the character count extension

packages/extension-character-count/README.md

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+# @tiptap/extension-character-count
+[![Version](https://img.shields.io/npm/v/@tiptap/extension-character-count.svg?label=version)](https://www.npmjs.com/package/@tiptap/extension-character-count)
+[![Downloads](https://img.shields.io/npm/dm/@tiptap/extension-character-count.svg)](https://npmcharts.com/compare/tiptap?minimal=true)
+[![License](https://img.shields.io/npm/l/@tiptap/extension-character-count.svg)](https://www.npmjs.com/package/@tiptap/extension-character-count)
+[![Sponsor](https://img.shields.io/static/v1?label=Sponsor&message=%E2%9D%A4&logo=GitHub)](https://github.com/sponsors/ueberdosis)
+
+## Introduction
+tiptap is a headless wrapper around [ProseMirror](https://ProseMirror.net) – a toolkit for building rich text WYSIWYG editors, which is already in use at many well-known companies such as *New York Times*, *The Guardian* or *Atlassian*.
+
+## Offical Documentation
+Documentation can be found on the [tiptap website](https://tiptap.dev).
+
+## License
+tiptap is open-sourced software licensed under the [MIT license](https://github.com/ueberdosis/tiptap-next/blob/main/LICENSE.md).

packages/extension-character-count/package.json

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+{
+  "name": "@tiptap/extension-character-count",
+  "description": "font family extension for tiptap",
+  "version": "2.0.0-alpha.5",
+  "homepage": "https://tiptap.dev",
+  "keywords": [
+    "tiptap",
+    "tiptap extension"
+  ],
+  "license": "MIT",
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/ueberdosis"
+  },
+  "main": "dist/tiptap-extension-character-count.cjs.js",
+  "umd": "dist/tiptap-extension-character-count.umd.js",
+  "module": "dist/tiptap-extension-character-count.esm.js",
+  "unpkg": "dist/tiptap-extension-character-count.bundle.umd.min.js",
+  "types": "dist/packages/extension-character-count/src/index.d.ts",
+  "files": [
+    "src",
+    "dist"
+  ],
+  "peerDependencies": {
+    "@tiptap/core": "^2.0.0-alpha.6",
+    "@tiptap/extension-text-style": "^2.0.0-alpha.0"
+  }
+}

packages/extension-character-count/src/character-count.ts

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+import { Extension } from '@tiptap/core'
+import { Plugin, PluginKey } from 'prosemirror-state'
+
+export const pluginKey = new PluginKey('characterLimit')
+
+export interface CharacterCountOptions {
+  limit?: number,
+}
+
+export const CharacterCount = Extension.create({
+  name: 'characterCount',
+
+  defaultOptions: <CharacterCountOptions>{
+    limit: 0,
+  },
+
+  addProseMirrorPlugins() {
+    const { options } = this
+
+    return [
+      new Plugin({
+
+        key: pluginKey,
+
+        appendTransaction: (transactions, oldState, newState) => {
+          const length = newState.doc.content.size
+
+          if (options.limit && length > options.limit) {
+            return newState.tr.insertText('', options.limit + 1, length)
+          }
+        },
+      }),
+    ]
+  },
+})
+
+declare module '@tiptap/core' {
+  interface AllExtensions {
+    CharacterCount: typeof CharacterCount,
+  }
+}

packages/extension-character-count/src/index.ts

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+import { CharacterCount } from './character-count'
+
+export * from './character-count'
+
+export default CharacterCount