@tiptap/extension-underline 3.11.0: type

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify @tiptap/extension-underline.type in pkg:npm/%40tiptap/extension-underline@3.11.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40tiptap/extension-underline@3.11.0
Demonstrate these symbols/APIs:
  - @tiptap/extension-underline.type

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

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{
  "name": "sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@tiptap/core": "3.11.0",
        "@tiptap/extension-underline": "3.11.0"
      }
    },
    "node_modules/@tiptap/core": {
      "version": "3.11.0",
      "resolved": "https://registry.npmjs.org/@tiptap/core/-/core-3.11.0.tgz",
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      "license": "MIT",
      "funding": {
        "type": "github",
        "url": "https://github.com/sponsors/ueberdosis"
      },
      "peerDependencies": {
        "@tiptap/pm": "^3.11.0"
      }
    },
    "node_modules/@tiptap/extension-underline": {
      "version": "3.11.0",
      "resolved": "https://registry.npmjs.org/@tiptap/extension-underline/-/extension-underline-3.11.0.tgz",
      "integrity": "sha512-D3PsS/84RlQKFjd5eerMIUioC0mNh4yy1RRV/WbXx6ugu+6T+0hT42gNk9Ap8pDsVQZCk0SHfDyBEUFC2KOwKw==",
      "license": "MIT",
      "funding": {
        "type": "github",
        "url": "https://github.com/sponsors/ueberdosis"
      },
      "peerDependencies": {
        "@tiptap/core": "^3.11.0"
      }
    },
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      "version": "3.31.3",
      "resolved": "https://registry.npmjs.org/@tiptap/pm/-/pm-3.31.3.tgz",
      "integrity": "sha512-sZime0SWsz/k62W2WvHx5Ig7G2h7kVhrrmnqy+wEgIHfDwEfOlelRjaWCiBCFlF7dxGUntJusCh9FxlLhni0Ag==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "prosemirror-changeset": "^2.4.1",
        "prosemirror-commands": "^1.7.1",
        "prosemirror-dropcursor": "^1.8.2",
        "prosemirror-gapcursor": "^1.4.1",
        "prosemirror-history": "^1.5.0",
        "prosemirror-inputrules": "^1.5.1",
        "prosemirror-keymap": "^1.2.3",
        "prosemirror-model": "^1.25.11",
        "prosemirror-schema-list": "^1.5.1",
        "prosemirror-state": "^1.4.4",
        "prosemirror-tables": "^1.8.5",
        "prosemirror-transform": "^1.12.0",
        "prosemirror-view": "^1.42.3"
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      "funding": {
        "type": "github",
        "url": "https://github.com/sponsors/ueberdosis"
      }
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    "node_modules/orderedmap": {
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      "license": "MIT",
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    "node_modules/prosemirror-gapcursor": {
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      "license": "MIT",
      "peer": true,
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        "prosemirror-state": "^1.0.0",
        "prosemirror-view": "^1.0.0"
      }
    },
    "node_modules/prosemirror-history": {
      "version": "1.5.0",
      "resolved": "https://registry.npmjs.org/prosemirror-history/-/prosemirror-history-1.5.0.tgz",
      "integrity": "sha512-zlzTiH01eKA55UAf1MEjtssJeHnGxO0j4K4Dpx+gnmX9n+SHNlDqI2oO1Kv1iPN5B1dm5fsljCfqKF9nFL6HRg==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
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        "prosemirror-transform": "^1.0.0",
        "prosemirror-view": "^1.31.0",
        "rope-sequence": "^1.3.0"
      }
    },
    "node_modules/prosemirror-inputrules": {
      "version": "1.5.1",
      "resolved": "https://registry.npmjs.org/prosemirror-inputrules/-/prosemirror-inputrules-1.5.1.tgz",
      "integrity": "sha512-7wj4uMjKaXWAQ1CDgxNzNtR9AlsuwzHfdFH1ygEHA2KHF2DOEaXl1CJfNPAKCg9qNEh4rum975QLaCiQPyY6Fw==",
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      "peer": true,
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        "prosemirror-transform": "^1.0.0"
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    "node_modules/prosemirror-keymap": {
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      "resolved": "https://registry.npmjs.org/prosemirror-keymap/-/prosemirror-keymap-1.2.3.tgz",
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      "resolved": "https://registry.npmjs.org/prosemirror-model/-/prosemirror-model-1.25.11.tgz",
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      "license": "MIT",
      "peer": true,
      "dependencies": {
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      }
    },
    "node_modules/prosemirror-schema-list": {
      "version": "1.5.1",
      "resolved": "https://registry.npmjs.org/prosemirror-schema-list/-/prosemirror-schema-list-1.5.1.tgz",
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        "prosemirror-transform": "^1.7.3"
      }
    },
    "node_modules/prosemirror-state": {
      "version": "1.4.4",
      "resolved": "https://registry.npmjs.org/prosemirror-state/-/prosemirror-state-1.4.4.tgz",
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        "prosemirror-transform": "^1.0.0",
        "prosemirror-view": "^1.27.0"
      }
    },
    "node_modules/prosemirror-tables": {
      "version": "1.8.5",
      "resolved": "https://registry.npmjs.org/prosemirror-tables/-/prosemirror-tables-1.8.5.tgz",
      "integrity": "sha512-V/0cDCsHKHe/tfWkeCmthNUcEp1IVO3p6vwN8XtwE9PZQLAZJigbw3QoraAdfJPir4NKJtNvOB8oYGKRl+t0Dw==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
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        "prosemirror-model": "^1.25.4",
        "prosemirror-state": "^1.4.4",
        "prosemirror-transform": "^1.10.5",
        "prosemirror-view": "^1.41.4"
      }
    },
    "node_modules/prosemirror-transform": {
      "version": "1.12.1",
      "resolved": "https://registry.npmjs.org/prosemirror-transform/-/prosemirror-transform-1.12.1.tgz",
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      "license": "MIT",
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      "dependencies": {
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      }
    },
    "node_modules/prosemirror-view": {
      "version": "1.42.3",
      "resolved": "https://registry.npmjs.org/prosemirror-view/-/prosemirror-view-1.42.3.tgz",
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        "prosemirror-state": "^1.0.0",
        "prosemirror-transform": "^1.1.0"
      }
    },
    "node_modules/rope-sequence": {
      "version": "1.3.4",
      "resolved": "https://registry.npmjs.org/rope-sequence/-/rope-sequence-1.3.4.tgz",
      "integrity": "sha512-UT5EDe2cu2E/6O4igUr5PSFs23nvvukicWHx6GnOPlHAiiYbzNuCRQCuiUdHJQcqKalLKlrYJnjY0ySGsXNQXQ==",
      "license": "MIT",
      "peer": true
    },
    "node_modules/w3c-keyname": {
      "version": "2.2.8",
      "resolved": "https://registry.npmjs.org/w3c-keyname/-/w3c-keyname-2.2.8.tgz",
      "integrity": "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ==",
      "license": "MIT",
      "peer": true
    }
  }
}

{
  "name": "sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@tiptap/core": "3.11.0",
    "@tiptap/extension-underline": "3.11.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @tiptap/extension-underline.type in pkg:npm/%40tiptap/extension-underline@3.11.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40tiptap/extension-underline@3.11.0"
  ],
  "symbols": [
    "@tiptap/extension-underline.type"
  ]
}

import assert from "node:assert/strict";
import { Node, getSchema } from "@tiptap/core";
import DefaultUnderline, { Underline } from "@tiptap/extension-underline";

// Assertion 1: Underline extension has type property equal to mark on default and named exports
assert.strictEqual(typeof Underline.type, "string", "Underline.type must be a string");
assert.strictEqual(Underline.type, "mark", "Underline extension type must be 'mark'");
assert.strictEqual(DefaultUnderline.type, "mark", "Default export type must be 'mark'");
assert.strictEqual(Underline.name, "underline", "Underline extension name must be 'underline'");

// Assertion 2: Underline configured instance preserves extension type mark
const configured = Underline.configure({
  HTMLAttributes: { class: "custom-underline" },
});
assert.strictEqual(configured.type, "mark", "Configured Underline instance type must be 'mark'");
assert.strictEqual(configured.name, "underline");

// Assertion 3: Underline extended instance preserves extension type mark
const extended = Underline.extend({
  name: "customUnderline",
});
assert.strictEqual(extended.type, "mark", "Extended Underline instance type must be 'mark'");

// Assertion 4: Underline extension type distinguishes mark extensions from node or generic extensions
assert.notStrictEqual(Underline.type, "node", "Underline type must not be 'node'");
assert.notStrictEqual(Underline.type, "extension", "Underline type must not be 'extension'");

// Assertion 5: Underline in ProseMirror schema creates marks with mark type name underline
const Doc = Node.create({ name: "doc", topNode: true, content: "block+" });
const Paragraph = Node.create({ name: "paragraph", group: "block", content: "inline*" });
const Text = Node.create({ name: "text", group: "inline" });

const schema = getSchema([Doc, Paragraph, Text, Underline]);
assert.ok(schema.marks.underline, "Schema must include underline mark");
const mark = schema.marks.underline.create();
assert.strictEqual(mark.type.name, "underline", "ProseMirror mark type name must be 'underline'");

// Assertion 6: Underline markdownTokenizer produces tokens with type underline
assert.strictEqual(typeof Underline.config.markdownTokenizer, "object", "markdownTokenizer must be defined");
assert.strictEqual(Underline.config.markdownTokenizer.name, "underline");
const tokenResult = Underline.config.markdownTokenizer.tokenize("++underlined++", [], {
  inlineTokens: (content) => [content],
});
assert.ok(tokenResult, "markdownTokenizer should match underline markdown");
assert.strictEqual(tokenResult.type, "underline", "markdownTokenizer output token type must be 'underline'");

console.log("PASS: @tiptap/extension-underline.type contract verified");