add basic mention extension

packages/extension-mention/README.md

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+# @tiptap/extension-mention
+[![Version](https://img.shields.io/npm/v/@tiptap/extension-mention.svg?label=version)](https://www.npmjs.com/package/@tiptap/extension-mention)
+[![Downloads](https://img.shields.io/npm/dm/@tiptap/extension-mention.svg)](https://npmcharts.com/compare/tiptap?minimal=true)
+[![License](https://img.shields.io/npm/l/@tiptap/extension-mention.svg)](https://www.npmjs.com/package/@tiptap/extension-mention)
+[![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-mention/package.json

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

packages/extension-mention/src/index.ts

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+import { Mention } from './mention'
+
+export * from './mention'
+
+export default Mention

packages/extension-mention/src/mention.ts

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+import { Node } from '@tiptap/core'
+import Suggestion from '@tiptap/suggestion'
+
+export const Mention = Node.create({
+  name: 'mention',
+
+  group: 'inline',
+
+  inline: true,
+
+  selectable: false,
+
+  atom: true,
+
+  addAttributes() {
+    return {
+      id: {
+        default: null,
+      },
+      label: {
+        default: null,
+      },
+    }
+  },
+
+  parseHTML() {
+    return [
+      {
+        tag: 'span[data-mention]',
+      },
+    ]
+  },
+
+  renderHTML({ node, HTMLAttributes }) {
+    return ['span', HTMLAttributes, `@${node.attrs.label}`]
+  },
+
+  addProseMirrorPlugins() {
+    return [
+      Suggestion({}),
+    ]
+  },
+})
+
+declare module '@tiptap/core' {
+  interface AllExtensions {
+    Mention: typeof Mention,
+  }
+}