snapshot of https://github.com/ueberdosis/tiptap.git (main, 2026-09-15; blobs > 131072B omitted)

packages/extension-underline/README.md

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

packages/extension-underline/package.json

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+{
+  "name": "@tiptap/extension-underline",
+  "version": "3.30.3",
+  "description": "underline extension for tiptap",
+  "keywords": [
+    "tiptap",
+    "tiptap extension"
+  ],
+  "homepage": "https://tiptap.dev",
+  "bugs": {
+    "url": "https://github.com/ueberdosis/tiptap/issues"
+  },
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/ueberdosis/tiptap",
+    "directory": "packages/extension-underline"
+  },
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/ueberdosis"
+  },
+  "files": [
+    "src",
+    "dist"
+  ],
+  "type": "module",
+  "main": "dist/index.cjs",
+  "module": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": {
+        "import": "./dist/index.d.ts",
+        "require": "./dist/index.d.cts"
+      },
+      "import": "./dist/index.js",
+      "require": "./dist/index.cjs"
+    }
+  },
+  "scripts": {
+    "build": "vp pack"
+  },
+  "devDependencies": {
+    "@tiptap/core": "workspace:^"
+  },
+  "peerDependencies": {
+    "@tiptap/core": "workspace:*"
+  }
+}

packages/extension-underline/src/index.ts

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+import { Underline } from './underline.js'
+
+export * from './underline.js'
+
+export default Underline

packages/extension-underline/src/underline.ts

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+import { Mark, mergeAttributes } from '@tiptap/core'
+
+export interface UnderlineOptions {
+  /**
+   * HTML attributes to add to the underline element.
+   * @default {}
+   * @example { class: 'foo' }
+   */
+  HTMLAttributes: Record<string, any>
+}
+
+declare module '@tiptap/core' {
+  interface Commands<ReturnType> {
+    underline: {
+      /**
+       * Set an underline mark
+       * @example editor.commands.setUnderline()
+       */
+      setUnderline: () => ReturnType
+      /**
+       * Toggle an underline mark
+       * @example editor.commands.toggleUnderline()
+       */
+      toggleUnderline: () => ReturnType
+      /**
+       * Unset an underline mark
+       * @example editor.commands.unsetUnderline()
+       */
+      unsetUnderline: () => ReturnType
+    }
+  }
+}
+
+/**
+ * This extension allows you to create underline text.
+ * @see https://www.tiptap.dev/api/marks/underline
+ */
+export const Underline = Mark.create<UnderlineOptions>({
+  name: 'underline',
+
+  addOptions() {
+    return {
+      HTMLAttributes: {},
+    }
+  },
+
+  parseHTML() {
+    return [
+      {
+        tag: 'u',
+      },
+      {
+        style: 'text-decoration',
+        consuming: false,
+        getAttrs: style => ((style as string).includes('underline') ? {} : false),
+      },
+    ]
+  },
+
+  renderHTML({ HTMLAttributes }) {
+    return ['u', mergeAttributes(this.options.HTMLAttributes, HTMLAttributes), 0]
+  },
+
+  parseMarkdown(token, helpers) {
+    return helpers.applyMark(this.name || 'underline', helpers.parseInline(token.tokens || []))
+  },
+
+  renderMarkdown(node, helpers) {
+    return `++${helpers.renderChildren(node)}++`
+  },
+
+  markdownTokenizer: {
+    name: 'underline',
+    level: 'inline',
+    start(src) {
+      return src.indexOf('++')
+    },
+    tokenize(src, _tokens, lexer) {
+      const rule = /^(\+\+)([\s\S]+?)(\+\+)/
+      const match = rule.exec(src)
+
+      if (!match) {
+        return undefined
+      }
+
+      const innerContent = match[2].trim()
+
+      return {
+        type: 'underline',
+        raw: match[0],
+        text: innerContent,
+        tokens: lexer.inlineTokens(innerContent),
+      }
+    },
+  },
+
+  addCommands() {
+    return {
+      setUnderline:
+        () =>
+        ({ commands }) => {
+          return commands.setMark(this.name)
+        },
+      toggleUnderline:
+        () =>
+        ({ commands }) => {
+          return commands.toggleMark(this.name)
+        },
+      unsetUnderline:
+        () =>
+        ({ commands }) => {
+          return commands.unsetMark(this.name)
+        },
+    }
+  },
+
+  addKeyboardShortcuts() {
+    return {
+      'Mod-u': () => this.editor.commands.toggleUnderline(),
+      'Mod-U': () => this.editor.commands.toggleUnderline(),
+    }
+  },
+})

packages/extension-underline/vite.config.ts

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+import { defineConfig } from 'vite-plus'
+import { basePackConfig } from '../../pack.config.mjs'
+
+export default defineConfig({
+  pack: {
+    entry: ['src/index.ts'],
+    ...basePackConfig(),
+  },
+})