@eslint/plugin-kit 0.4.1: ConfigCommentParser

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 @eslint/plugin-kit.ConfigCommentParser in pkg:npm/%40eslint/plugin-kit@0.4.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40eslint/plugin-kit@0.4.1
Demonstrate these symbols/APIs:
  - @eslint/plugin-kit.ConfigCommentParser
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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.

{"case":{"caseId":"case:sha256:6a1a9c994124cc17d1166a7d331e5b7c904883af9894d8c0c4b7133e337ef5f9","constraints":{"executionContext":"node"},"contract":["assert ConfigCommentParser.parseDirective parses comments into label, value, and justification","assert ConfigCommentParser.parseDirective returns undefined for empty or invalid directive text","assert ConfigCommentParser.parseStringConfig parses key-value pairs into string values and null defaults","assert ConfigCommentParser.parseListConfig parses comma-separated rule lists into boolean true maps","assert ConfigCommentParser.parseJSONLikeConfig parses relaxed JSON configs and returns ok true with config","assert ConfigCommentParser.parseJSONLikeConfig returns ok false with error message for invalid syntax"],"goal":"verify @eslint/plugin-kit.ConfigCommentParser in pkg:npm/%40eslint/plugin-kit@0.4.1","kind":"HOW","packages":["pkg:npm/%40eslint/plugin-kit@0.4.1"],"schemaVersion":1,"symbols":["@eslint/plugin-kit.ConfigCommentParser"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40eslint/plugin-kit@0.4.1"],"schemaVersion":1,"subject":"pkg:npm/%40eslint/plugin-kit@0.4.1","symbols":["@eslint/plugin-kit.ConfigCommentParser"],"verifierAdapter":"node-typescript@1"}

const { ConfigCommentParser } = require('@eslint/plugin-kit');

/**
 * Parses an ESLint directive comment string into its components.
 *
 * @param {string} comment - Comment text without comment delimiters.
 * @returns {object|undefined} Parsed directive or undefined if invalid.
 */
function parseCommentDirective(comment) {
  const parser = new ConfigCommentParser();
  return parser.parseDirective(comment);
}

/**
 * Parses a comma- or whitespace-separated list of configuration options.
 *
 * @param {string} text - Configuration string in format "name:value, name".
 * @returns {Record<string, string|null>} Map of names to string values or null.
 */
function parseStringConfig(text) {
  const parser = new ConfigCommentParser();
  return parser.parseStringConfig(text);
}

/**
 * Parses a comma-separated list of rule names.
 *
 * @param {string} text - List of rule names separated by commas.
 * @returns {Record<string, true>} Map of rule names to boolean true.
 */
function parseListConfig(text) {
  const parser = new ConfigCommentParser();
  return parser.parseListConfig(text);
}

/**
 * Parses a relaxed JSON-like configuration string.
 *
 * @param {string} text - JSON-like configuration string.
 * @returns {{ ok: true, config: object } | { ok: false, error: { message: string } }} Parsing result.
 */
function parseJSONLikeConfig(text) {
  const parser = new ConfigCommentParser();
  return parser.parseJSONLikeConfig(text);
}

module.exports = {
  ConfigCommentParser,
  parseCommentDirective,
  parseStringConfig,
  parseListConfig,
  parseJSONLikeConfig,
};

{
  "name": "sample-eslint-plugin-kit-config-comment-parser",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-eslint-plugin-kit-config-comment-parser",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@eslint/plugin-kit": "0.4.1"
      }
    },
    "node_modules/@eslint/core": {
      "version": "0.17.0",
      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-0.17.0.tgz",
      "integrity": "sha512-yL/sLrpmtDaFEiUj1osRP4TI2MDz1AddJL+jZ7KSqvBuliN4xqYY54IfdN8qD8Toa6g1iloph1fxQNkjOxrrpQ==",
      "license": "Apache-2.0",
      "dependencies": {
        "@types/json-schema": "^7.0.15"
      },
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      }
    },
    "node_modules/@eslint/plugin-kit": {
      "version": "0.4.1",
      "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.4.1.tgz",
      "integrity": "sha512-43/qtrDUokr7LJqoF2c3+RInu/t4zfrpYdoSDfYyhg52rwLV6TnOvdG4fXm7IkSB3wErkcmJS9iEhjVtOSEjjA==",
      "license": "Apache-2.0",
      "dependencies": {
        "@eslint/core": "^0.17.0",
        "levn": "^0.4.1"
      },
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      }
    },
    "node_modules/@types/json-schema": {
      "version": "7.0.15",
      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.15.tgz",
      "integrity": "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==",
      "license": "MIT"
    },
    "node_modules/levn": {
      "version": "0.4.1",
      "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
      "integrity": "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==",
      "license": "MIT",
      "dependencies": {
        "prelude-ls": "^1.2.1",
        "type-check": "~0.4.0"
      },
      "engines": {
        "node": ">= 0.8.0"
      }
    },
    "node_modules/prelude-ls": {
      "version": "1.2.1",
      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
      "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.8.0"
      }
    },
    "node_modules/type-check": {
      "version": "0.4.0",
      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
      "license": "MIT",
      "dependencies": {
        "prelude-ls": "^1.2.1"
      },
      "engines": {
        "node": ">= 0.8.0"
      }
    }
  }
}

{
  "name": "sample-eslint-plugin-kit-config-comment-parser",
  "version": "1.0.0",
  "description": "Clean-room sample verifying @eslint/plugin-kit ConfigCommentParser",
  "main": "index.js",
  "license": "MIT-0",
  "dependencies": {
    "@eslint/plugin-kit": "0.4.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @eslint/plugin-kit.ConfigCommentParser in pkg:npm/%40eslint/plugin-kit@0.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40eslint/plugin-kit@0.4.1"
  ],
  "symbols": [
    "@eslint/plugin-kit.ConfigCommentParser"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert';
import {
  ConfigCommentParser,
  parseCommentDirective,
  parseStringConfig,
  parseListConfig,
  parseJSONLikeConfig,
} from '../index.js';

// 1. Verify ConfigCommentParser.parseDirective
const parser = new ConfigCommentParser();

const directiveWithJustification = parser.parseDirective(
  'eslint-disable prefer-const, semi -- disable rules with comment'
);
assert.strictEqual(directiveWithJustification.label, 'eslint-disable');
assert.strictEqual(directiveWithJustification.value, 'prefer-const, semi');
assert.strictEqual(
  directiveWithJustification.justification,
  'disable rules with comment'
);

const directiveWithoutJustification = parser.parseDirective('eslint-enable no-console');
assert.strictEqual(directiveWithoutJustification.label, 'eslint-enable');
assert.strictEqual(directiveWithoutJustification.value, 'no-console');
assert.strictEqual(directiveWithoutJustification.justification, '');

const emptyDirective = parser.parseDirective('');
assert.strictEqual(emptyDirective, undefined);

const nonDirective = parser.parseDirective('!eslint-disable');
assert.strictEqual(nonDirective, undefined);

const helperDirective = parseCommentDirective(
  'eslint-disable-line no-undef -- inline suppression'
);
assert.strictEqual(helperDirective.label, 'eslint-disable-line');
assert.strictEqual(helperDirective.value, 'no-undef');
assert.strictEqual(helperDirective.justification, 'inline suppression');

// 2. Verify ConfigCommentParser.parseStringConfig
const stringConfigResult = parser.parseStringConfig('quotes: single, semi: always, indent');
assert.deepStrictEqual(stringConfigResult, {
  quotes: 'single',
  semi: 'always',
  indent: null,
});

const helperStringConfig = parseStringConfig('env: browser, es6');
assert.deepStrictEqual(helperStringConfig, {
  env: 'browser',
  es6: null,
});

// 3. Verify ConfigCommentParser.parseListConfig
const listConfigResult = parser.parseListConfig('no-unused-vars, eqeqeq, curly');
assert.deepStrictEqual(listConfigResult, {
  'no-unused-vars': true,
  eqeqeq: true,
  curly: true,
});

const quotedListConfig = parser.parseListConfig('"no-alert", \'no-debugger\'');
assert.deepStrictEqual(quotedListConfig, {
  'no-alert': true,
  'no-debugger': true,
});

const helperListConfig = parseListConfig('no-alert, no-debugger');
assert.deepStrictEqual(helperListConfig, {
  'no-alert': true,
  'no-debugger': true,
});

// 4. Verify ConfigCommentParser.parseJSONLikeConfig
const validJSONResult = parser.parseJSONLikeConfig(
  'semi: ["error", "never"], prefer-const: "warn"'
);
assert.strictEqual(validJSONResult.ok, true);
assert.deepStrictEqual(validJSONResult.config, {
  semi: ['error', 'never'],
  'prefer-const': 'warn',
});

const invalidJSONResult = parser.parseJSONLikeConfig('invalid { json syntax');
assert.strictEqual(invalidJSONResult.ok, false);
assert.ok(invalidJSONResult.error);
assert.strictEqual(typeof invalidJSONResult.error.message, 'string');

const helperJSONResult = parseJSONLikeConfig('rules: { indent: 2 }');
assert.strictEqual(helperJSONResult.ok, true);
assert.deepStrictEqual(helperJSONResult.config, {
  rules: { indent: 2 },
});

console.log('All ConfigCommentParser contract assertions passed successfully.');