fix: resolve TypeScript errors in frontend build

node_modules/@tiptap/extension-underline/LICENSE.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025, Tiptap GmbH
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

node_modules/@tiptap/extension-underline/README.md

@@ -0,0 +1,18 @@
+# @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).

node_modules/@tiptap/extension-underline/dist/index.cjs

@@ -0,0 +1,106 @@
+"use strict";
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __export = (target, all) => {
+  for (var name in all)
+    __defProp(target, name, { get: all[name], enumerable: true });
+};
+var __copyProps = (to, from, except, desc) => {
+  if (from && typeof from === "object" || typeof from === "function") {
+    for (let key of __getOwnPropNames(from))
+      if (!__hasOwnProp.call(to, key) && key !== except)
+        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
+  }
+  return to;
+};
+var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
+
+// src/index.ts
+var index_exports = {};
+__export(index_exports, {
+  Underline: () => Underline,
+  default: () => index_default
+});
+module.exports = __toCommonJS(index_exports);
+
+// src/underline.ts
+var import_core = require("@tiptap/core");
+var Underline = import_core.Mark.create({
+  name: "underline",
+  addOptions() {
+    return {
+      HTMLAttributes: {}
+    };
+  },
+  parseHTML() {
+    return [
+      {
+        tag: "u"
+      },
+      {
+        style: "text-decoration",
+        consuming: false,
+        getAttrs: (style) => style.includes("underline") ? {} : false
+      }
+    ];
+  },
+  renderHTML({ HTMLAttributes }) {
+    return ["u", (0, import_core.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 void 0;
+      }
+      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()
+    };
+  }
+});
+
+// src/index.ts
+var index_default = Underline;
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  Underline
+});
+//# sourceMappingURL=index.cjs.map

node_modules/@tiptap/extension-underline/dist/index.cjs.map

@@ -0,0 +1 @@
+{"version":3,"sources":["../src/index.ts","../src/underline.ts"],"sourcesContent":["import { Underline } from './underline.js'\n\nexport * from './underline.js'\n\nexport default Underline\n","import { Mark, mergeAttributes } from '@tiptap/core'\n\nexport interface UnderlineOptions {\n  /**\n   * HTML attributes to add to the underline element.\n   * @default {}\n   * @example { class: 'foo' }\n   */\n  HTMLAttributes: Record<string, any>\n}\n\ndeclare module '@tiptap/core' {\n  interface Commands<ReturnType> {\n    underline: {\n      /**\n       * Set an underline mark\n       * @example editor.commands.setUnderline()\n       */\n      setUnderline: () => ReturnType\n      /**\n       * Toggle an underline mark\n       * @example editor.commands.toggleUnderline()\n       */\n      toggleUnderline: () => ReturnType\n      /**\n       * Unset an underline mark\n       * @example editor.commands.unsetUnderline()\n       */\n      unsetUnderline: () => ReturnType\n    }\n  }\n}\n\n/**\n * This extension allows you to create underline text.\n * @see https://www.tiptap.dev/api/marks/underline\n */\nexport const Underline = Mark.create<UnderlineOptions>({\n  name: 'underline',\n\n  addOptions() {\n    return {\n      HTMLAttributes: {},\n    }\n  },\n\n  parseHTML() {\n    return [\n      {\n        tag: 'u',\n      },\n      {\n        style: 'text-decoration',\n        consuming: false,\n        getAttrs: style => ((style as string).includes('underline') ? {} : false),\n      },\n    ]\n  },\n\n  renderHTML({ HTMLAttributes }) {\n    return ['u', mergeAttributes(this.options.HTMLAttributes, HTMLAttributes), 0]\n  },\n\n  parseMarkdown(token, helpers) {\n    return helpers.applyMark(this.name || 'underline', helpers.parseInline(token.tokens || []))\n  },\n\n  renderMarkdown(node, helpers) {\n    return `++${helpers.renderChildren(node)}++`\n  },\n\n  markdownTokenizer: {\n    name: 'underline',\n    level: 'inline',\n    start(src) {\n      return src.indexOf('++')\n    },\n    tokenize(src, _tokens, lexer) {\n      const rule = /^(\\+\\+)([\\s\\S]+?)(\\+\\+)/\n      const match = rule.exec(src)\n\n      if (!match) {\n        return undefined\n      }\n\n      const innerContent = match[2].trim()\n\n      return {\n        type: 'underline',\n        raw: match[0],\n        text: innerContent,\n        tokens: lexer.inlineTokens(innerContent),\n      }\n    },\n  },\n\n  addCommands() {\n    return {\n      setUnderline:\n        () =>\n        ({ commands }) => {\n          return commands.setMark(this.name)\n        },\n      toggleUnderline:\n        () =>\n        ({ commands }) => {\n          return commands.toggleMark(this.name)\n        },\n      unsetUnderline:\n        () =>\n        ({ commands }) => {\n          return commands.unsetMark(this.name)\n        },\n    }\n  },\n\n  addKeyboardShortcuts() {\n    return {\n      'Mod-u': () => this.editor.commands.toggleUnderline(),\n      'Mod-U': () => this.editor.commands.toggleUnderline(),\n    }\n  },\n})\n"],"mappings":";;;;;;;;;;;;;;;;;;;;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;;;ACAA,kBAAsC;AAqC/B,IAAM,YAAY,iBAAK,OAAyB;AAAA,EACrD,MAAM;AAAA,EAEN,aAAa;AACX,WAAO;AAAA,MACL,gBAAgB,CAAC;AAAA,IACnB;AAAA,EACF;AAAA,EAEA,YAAY;AACV,WAAO;AAAA,MACL;AAAA,QACE,KAAK;AAAA,MACP;AAAA,MACA;AAAA,QACE,OAAO;AAAA,QACP,WAAW;AAAA,QACX,UAAU,WAAW,MAAiB,SAAS,WAAW,IAAI,CAAC,IAAI;AAAA,MACrE;AAAA,IACF;AAAA,EACF;AAAA,EAEA,WAAW,EAAE,eAAe,GAAG;AAC7B,WAAO,CAAC,SAAK,6BAAgB,KAAK,QAAQ,gBAAgB,cAAc,GAAG,CAAC;AAAA,EAC9E;AAAA,EAEA,cAAc,OAAO,SAAS;AAC5B,WAAO,QAAQ,UAAU,KAAK,QAAQ,aAAa,QAAQ,YAAY,MAAM,UAAU,CAAC,CAAC,CAAC;AAAA,EAC5F;AAAA,EAEA,eAAe,MAAM,SAAS;AAC5B,WAAO,KAAK,QAAQ,eAAe,IAAI,CAAC;AAAA,EAC1C;AAAA,EAEA,mBAAmB;AAAA,IACjB,MAAM;AAAA,IACN,OAAO;AAAA,IACP,MAAM,KAAK;AACT,aAAO,IAAI,QAAQ,IAAI;AAAA,IACzB;AAAA,IACA,SAAS,KAAK,SAAS,OAAO;AAC5B,YAAM,OAAO;AACb,YAAM,QAAQ,KAAK,KAAK,GAAG;AAE3B,UAAI,CAAC,OAAO;AACV,eAAO;AAAA,MACT;AAEA,YAAM,eAAe,MAAM,CAAC,EAAE,KAAK;AAEnC,aAAO;AAAA,QACL,MAAM;AAAA,QACN,KAAK,MAAM,CAAC;AAAA,QACZ,MAAM;AAAA,QACN,QAAQ,MAAM,aAAa,YAAY;AAAA,MACzC;AAAA,IACF;AAAA,EACF;AAAA,EAEA,cAAc;AACZ,WAAO;AAAA,MACL,cACE,MACA,CAAC,EAAE,SAAS,MAAM;AAChB,eAAO,SAAS,QAAQ,KAAK,IAAI;AAAA,MACnC;AAAA,MACF,iBACE,MACA,CAAC,EAAE,SAAS,MAAM;AAChB,eAAO,SAAS,WAAW,KAAK,IAAI;AAAA,MACtC;AAAA,MACF,gBACE,MACA,CAAC,EAAE,SAAS,MAAM;AAChB,eAAO,SAAS,UAAU,KAAK,IAAI;AAAA,MACrC;AAAA,IACJ;AAAA,EACF;AAAA,EAEA,uBAAuB;AACrB,WAAO;AAAA,MACL,SAAS,MAAM,KAAK,OAAO,SAAS,gBAAgB;AAAA,MACpD,SAAS,MAAM,KAAK,OAAO,SAAS,gBAAgB;AAAA,IACtD;AAAA,EACF;AACF,CAAC;;;ADtHD,IAAO,gBAAQ;","names":[]}

node_modules/@tiptap/extension-underline/dist/index.d.cts

@@ -0,0 +1,38 @@
+import { Mark } from '@tiptap/core';
+
+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
+ */
+declare const Underline: Mark<UnderlineOptions, any>;
+
+export { Underline, type UnderlineOptions, Underline as default };

node_modules/@tiptap/extension-underline/dist/index.d.ts

@@ -0,0 +1,38 @@
+import { Mark } from '@tiptap/core';
+
+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
+ */
+declare const Underline: Mark<UnderlineOptions, any>;
+
+export { Underline, type UnderlineOptions, Underline as default };

node_modules/@tiptap/extension-underline/dist/index.js

@@ -0,0 +1,79 @@
+// src/underline.ts
+import { Mark, mergeAttributes } from "@tiptap/core";
+var Underline = Mark.create({
+  name: "underline",
+  addOptions() {
+    return {
+      HTMLAttributes: {}
+    };
+  },
+  parseHTML() {
+    return [
+      {
+        tag: "u"
+      },
+      {
+        style: "text-decoration",
+        consuming: false,
+        getAttrs: (style) => style.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 void 0;
+      }
+      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()
+    };
+  }
+});
+
+// src/index.ts
+var index_default = Underline;
+export {
+  Underline,
+  index_default as default
+};
+//# sourceMappingURL=index.js.map

node_modules/@tiptap/extension-underline/dist/index.js.map

@@ -0,0 +1 @@
+{"version":3,"sources":["../src/underline.ts","../src/index.ts"],"sourcesContent":["import { Mark, mergeAttributes } from '@tiptap/core'\n\nexport interface UnderlineOptions {\n  /**\n   * HTML attributes to add to the underline element.\n   * @default {}\n   * @example { class: 'foo' }\n   */\n  HTMLAttributes: Record<string, any>\n}\n\ndeclare module '@tiptap/core' {\n  interface Commands<ReturnType> {\n    underline: {\n      /**\n       * Set an underline mark\n       * @example editor.commands.setUnderline()\n       */\n      setUnderline: () => ReturnType\n      /**\n       * Toggle an underline mark\n       * @example editor.commands.toggleUnderline()\n       */\n      toggleUnderline: () => ReturnType\n      /**\n       * Unset an underline mark\n       * @example editor.commands.unsetUnderline()\n       */\n      unsetUnderline: () => ReturnType\n    }\n  }\n}\n\n/**\n * This extension allows you to create underline text.\n * @see https://www.tiptap.dev/api/marks/underline\n */\nexport const Underline = Mark.create<UnderlineOptions>({\n  name: 'underline',\n\n  addOptions() {\n    return {\n      HTMLAttributes: {},\n    }\n  },\n\n  parseHTML() {\n    return [\n      {\n        tag: 'u',\n      },\n      {\n        style: 'text-decoration',\n        consuming: false,\n        getAttrs: style => ((style as string).includes('underline') ? {} : false),\n      },\n    ]\n  },\n\n  renderHTML({ HTMLAttributes }) {\n    return ['u', mergeAttributes(this.options.HTMLAttributes, HTMLAttributes), 0]\n  },\n\n  parseMarkdown(token, helpers) {\n    return helpers.applyMark(this.name || 'underline', helpers.parseInline(token.tokens || []))\n  },\n\n  renderMarkdown(node, helpers) {\n    return `++${helpers.renderChildren(node)}++`\n  },\n\n  markdownTokenizer: {\n    name: 'underline',\n    level: 'inline',\n    start(src) {\n      return src.indexOf('++')\n    },\n    tokenize(src, _tokens, lexer) {\n      const rule = /^(\\+\\+)([\\s\\S]+?)(\\+\\+)/\n      const match = rule.exec(src)\n\n      if (!match) {\n        return undefined\n      }\n\n      const innerContent = match[2].trim()\n\n      return {\n        type: 'underline',\n        raw: match[0],\n        text: innerContent,\n        tokens: lexer.inlineTokens(innerContent),\n      }\n    },\n  },\n\n  addCommands() {\n    return {\n      setUnderline:\n        () =>\n        ({ commands }) => {\n          return commands.setMark(this.name)\n        },\n      toggleUnderline:\n        () =>\n        ({ commands }) => {\n          return commands.toggleMark(this.name)\n        },\n      unsetUnderline:\n        () =>\n        ({ commands }) => {\n          return commands.unsetMark(this.name)\n        },\n    }\n  },\n\n  addKeyboardShortcuts() {\n    return {\n      'Mod-u': () => this.editor.commands.toggleUnderline(),\n      'Mod-U': () => this.editor.commands.toggleUnderline(),\n    }\n  },\n})\n","import { Underline } from './underline.js'\n\nexport * from './underline.js'\n\nexport default Underline\n"],"mappings":";AAAA,SAAS,MAAM,uBAAuB;AAqC/B,IAAM,YAAY,KAAK,OAAyB;AAAA,EACrD,MAAM;AAAA,EAEN,aAAa;AACX,WAAO;AAAA,MACL,gBAAgB,CAAC;AAAA,IACnB;AAAA,EACF;AAAA,EAEA,YAAY;AACV,WAAO;AAAA,MACL;AAAA,QACE,KAAK;AAAA,MACP;AAAA,MACA;AAAA,QACE,OAAO;AAAA,QACP,WAAW;AAAA,QACX,UAAU,WAAW,MAAiB,SAAS,WAAW,IAAI,CAAC,IAAI;AAAA,MACrE;AAAA,IACF;AAAA,EACF;AAAA,EAEA,WAAW,EAAE,eAAe,GAAG;AAC7B,WAAO,CAAC,KAAK,gBAAgB,KAAK,QAAQ,gBAAgB,cAAc,GAAG,CAAC;AAAA,EAC9E;AAAA,EAEA,cAAc,OAAO,SAAS;AAC5B,WAAO,QAAQ,UAAU,KAAK,QAAQ,aAAa,QAAQ,YAAY,MAAM,UAAU,CAAC,CAAC,CAAC;AAAA,EAC5F;AAAA,EAEA,eAAe,MAAM,SAAS;AAC5B,WAAO,KAAK,QAAQ,eAAe,IAAI,CAAC;AAAA,EAC1C;AAAA,EAEA,mBAAmB;AAAA,IACjB,MAAM;AAAA,IACN,OAAO;AAAA,IACP,MAAM,KAAK;AACT,aAAO,IAAI,QAAQ,IAAI;AAAA,IACzB;AAAA,IACA,SAAS,KAAK,SAAS,OAAO;AAC5B,YAAM,OAAO;AACb,YAAM,QAAQ,KAAK,KAAK,GAAG;AAE3B,UAAI,CAAC,OAAO;AACV,eAAO;AAAA,MACT;AAEA,YAAM,eAAe,MAAM,CAAC,EAAE,KAAK;AAEnC,aAAO;AAAA,QACL,MAAM;AAAA,QACN,KAAK,MAAM,CAAC;AAAA,QACZ,MAAM;AAAA,QACN,QAAQ,MAAM,aAAa,YAAY;AAAA,MACzC;AAAA,IACF;AAAA,EACF;AAAA,EAEA,cAAc;AACZ,WAAO;AAAA,MACL,cACE,MACA,CAAC,EAAE,SAAS,MAAM;AAChB,eAAO,SAAS,QAAQ,KAAK,IAAI;AAAA,MACnC;AAAA,MACF,iBACE,MACA,CAAC,EAAE,SAAS,MAAM;AAChB,eAAO,SAAS,WAAW,KAAK,IAAI;AAAA,MACtC;AAAA,MACF,gBACE,MACA,CAAC,EAAE,SAAS,MAAM;AAChB,eAAO,SAAS,UAAU,KAAK,IAAI;AAAA,MACrC;AAAA,IACJ;AAAA,EACF;AAAA,EAEA,uBAAuB;AACrB,WAAO;AAAA,MACL,SAAS,MAAM,KAAK,OAAO,SAAS,gBAAgB;AAAA,MACpD,SAAS,MAAM,KAAK,OAAO,SAAS,gBAAgB;AAAA,IACtD;AAAA,EACF;AACF,CAAC;;;ACtHD,IAAO,gBAAQ;","names":[]}

node_modules/@tiptap/extension-underline/package.json

@@ -0,0 +1,48 @@
+{
+  "name": "@tiptap/extension-underline",
+  "description": "underline extension for tiptap",
+  "version": "3.21.0",
+  "homepage": "https://tiptap.dev",
+  "keywords": [
+    "tiptap",
+    "tiptap extension"
+  ],
+  "license": "MIT",
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/ueberdosis"
+  },
+  "type": "module",
+  "exports": {
+    ".": {
+      "types": {
+        "import": "./dist/index.d.ts",
+        "require": "./dist/index.d.cts"
+      },
+      "import": "./dist/index.js",
+      "require": "./dist/index.cjs"
+    }
+  },
+  "main": "dist/index.cjs",
+  "module": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "files": [
+    "src",
+    "dist"
+  ],
+  "devDependencies": {
+    "@tiptap/core": "^3.21.0"
+  },
+  "peerDependencies": {
+    "@tiptap/core": "^3.21.0"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/ueberdosis/tiptap",
+    "directory": "packages/extension-underline"
+  },
+  "scripts": {
+    "build": "tsup",
+    "lint": "prettier ./src/ --check && eslint --cache --quiet --no-error-on-unmatched-pattern ./src/"
+  }
+}

node_modules/@tiptap/extension-underline/src/index.ts

@@ -0,0 +1,5 @@
+import { Underline } from './underline.js'
+
+export * from './underline.js'
+
+export default Underline

node_modules/@tiptap/extension-underline/src/underline.ts

@@ -0,0 +1,123 @@
+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(),
+    }
+  },
+})