@tiptap/extension-underline 3.11.0: options

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.options 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.options

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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      }
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      }
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    },
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      "license": "MIT",
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}

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

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

// Assertion 1: Underline.options is a getter that returns default options with empty HTMLAttributes
assert.strictEqual(typeof Underline.options, "object", "Underline.options must be an object");
assert.ok(Underline.options !== null, "Underline.options must not be null");
assert.ok("HTMLAttributes" in Underline.options, "Underline.options must have HTMLAttributes property");
assert.deepStrictEqual(Underline.options.HTMLAttributes, {}, "Default HTMLAttributes must be an empty object");
assert.deepStrictEqual(DefaultUnderline.options, Underline.options, "Default export options must match named export options");
// Underline.options is a getter returning fresh objects each access
assert.notStrictEqual(Underline.options, Underline.options, "Underline.options getter returns fresh object on each access");

// Assertion 2: Underline.configure sets custom HTMLAttributes on the options object without mutating original Underline options
const customAttributes = { class: "custom-underline-class", "data-testid": "underline" };
const configuredUnderline = Underline.configure({
  HTMLAttributes: customAttributes,
});
assert.strictEqual(typeof configuredUnderline.options, "object", "Configured instance options must be an object");
assert.deepStrictEqual(configuredUnderline.options.HTMLAttributes, customAttributes, "Configured instance must reflect custom HTMLAttributes in options");
assert.deepStrictEqual(Underline.options.HTMLAttributes, {}, "Original Underline.options must remain unchanged");

// Assertion 3: Underline renderHTML merges options HTMLAttributes with node-specific HTMLAttributes
const renderedWithDefaultOptions = Underline.config.renderHTML.call(
  { options: { HTMLAttributes: {} } },
  { HTMLAttributes: { class: "direct-class" } }
);
assert.deepStrictEqual(renderedWithDefaultOptions, ["u", { class: "direct-class" }, 0], "renderHTML should use node HTMLAttributes when options HTMLAttributes is empty");

const renderedWithCustomOptions = Underline.config.renderHTML.call(
  { options: { HTMLAttributes: { class: "base-class", title: "Underlined text" } } },
  { HTMLAttributes: { class: "override-class", id: "sample-u" } }
);
assert.strictEqual(renderedWithCustomOptions[0], "u", "Rendered tag must be 'u'");
assert.strictEqual(renderedWithCustomOptions[2], 0, "Rendered hole index must be 0");
assert.strictEqual(renderedWithCustomOptions[1].title, "Underlined text", "options.HTMLAttributes title must be merged");
assert.strictEqual(renderedWithCustomOptions[1].id, "sample-u", "node HTMLAttributes id must be merged");
assert.ok(renderedWithCustomOptions[1].class.includes("base-class"), "Merged class must include base-class from options");
assert.ok(renderedWithCustomOptions[1].class.includes("override-class"), "Merged class must include override-class");

// Assertion 4: Underline.extend inherits and augments default options returned by the options getter
const ExtendedUnderline = Underline.extend({
  addOptions() {
    return {
      ...this.parent?.(),
      HTMLAttributes: { "data-extended": "true" },
      extraOption: 42,
    };
  },
});
assert.strictEqual(typeof ExtendedUnderline.options, "object", "ExtendedUnderline.options must be an object");
assert.strictEqual(ExtendedUnderline.options.HTMLAttributes["data-extended"], "true", "Extended Underline options must have overridden HTMLAttributes");
assert.strictEqual(ExtendedUnderline.options.extraOption, 42, "Extended Underline options must contain extraOption");

// Assertion 5: Underline options are accessible when compiled into an editor schema
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 configured = Underline.configure({
  HTMLAttributes: { class: "editor-underline" },
});
const schema = getSchema([Doc, Paragraph, Text, configured]);
assert.ok(schema.marks.underline, "Schema must include configured underline mark");
assert.strictEqual(configured.options.HTMLAttributes.class, "editor-underline", "options.HTMLAttributes must match configured value");

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