CodeSampleX

Sample

@typescript-eslint/utils 8.65.0: ESLintUtils

Verified sample for npm @typescript-eslint/utils 8.65.0: ESLintUtils. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:a9b1171bf100069a4a20a49cc1a75cf9ef717de3e7cf2a47004efcdce09f96a4

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-05

Case

HOW
Goal
verify @typescript-eslint/utils.ESLintUtils in pkg:npm/%40typescript-eslint/utils@8.65.0
Packages
Symbols
  • @typescript-eslint/utils.ESLintUtils
Environment
node 22.23.2
Created
2026-09-05T15:45:45Z

Contract

  1. RuleCreator produces a rule creation helper that sets meta.docs.url using the provided url generator
  2. applyDefault merges user rule options into default option tuples without mutating defaults
  3. deepMerge recursively merges nested configuration objects into a new object
  4. isObjectNotArray returns true for plain objects and false for arrays, null, and primitives
  5. nullThrows returns non-null values and throws Non-null Assertion Failed error when passed null or undefined
  6. NullThrowsReasons provides standard diagnostic error messages including MissingParent and MissingToken

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • test/contract.cjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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 @typescript-eslint/utils.ESLintUtils in pkg:npm/%40typescript-eslint/utils@8.65.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40typescript-eslint/utils@8.65.0
Demonstrate these symbols/APIs:
  - @typescript-eslint/utils.ESLintUtils

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.
csx.json
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package-lock.json
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package.json
{
  "name": "verify-typescript-eslint-utils",
  "version": "1.0.0",
  "private": true,
  "description": "verify @typescript-eslint/utils.ESLintUtils in pkg:npm/@typescript-eslint/utils@8.65.0",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.cjs"
  },
  "dependencies": {
    "@typescript-eslint/utils": "8.65.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @typescript-eslint/utils.ESLintUtils in pkg:npm/%40typescript-eslint/utils@8.65.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40typescript-eslint/utils@8.65.0"
  ],
  "symbols": [
    "@typescript-eslint/utils.ESLintUtils"
  ]
}
src/index.js
const { ESLintUtils } = require('@typescript-eslint/utils');

/**
 * Creates a configured rule creator function with the documentation URL generator.
 *
 * @param {string} [baseUrl='https://example.com/rules'] - Base URL for rule documentation
 * @returns {Function} - Configured RuleCreator function
 */
function createRuleFactory(baseUrl = 'https://example.com/rules') {
  return ESLintUtils.RuleCreator((name) => `${baseUrl}/${name}`);
}

/**
 * Merges user options over default rule options.
 *
 * @param {Array} defaultOptions - Default rule option tuple
 * @param {Array} userOptions - User-supplied rule options
 * @returns {Array} - Merged option tuple
 */
function mergeRuleOptions(defaultOptions, userOptions) {
  return ESLintUtils.applyDefault(defaultOptions, userOptions);
}

/**
 * Deeply merges two configuration objects.
 *
 * @param {object} first - First object
 * @param {object} second - Second object to merge onto the first
 * @returns {object} - Merged object
 */
function mergeConfigs(first, second) {
  return ESLintUtils.deepMerge(first, second);
}

/**
 * Checks whether a value is a valid non-null, non-array object.
 *
 * @param {*} value - Value to inspect
 * @returns {boolean} - True if value is an object and not an array
 */
function isPlainObject(value) {
  return ESLintUtils.isObjectNotArray(value);
}

/**
 * Asserts that a value is non-null and non-undefined.
 *
 * @param {*} value - Value to check
 * @param {string} [reason] - Diagnostic reason message
 * @returns {*} - The input value if valid
 */
function assertNonNull(value, reason) {
  return ESLintUtils.nullThrows(value, reason);
}

module.exports = {
  ESLintUtils,
  createRuleFactory,
  mergeRuleOptions,
  mergeConfigs,
  isPlainObject,
  assertNonNull,
};
test/contract.cjs
const assert = require('node:assert/strict');
const { ESLintUtils } = require('@typescript-eslint/utils');
const {
  createRuleFactory,
  mergeRuleOptions,
  mergeConfigs,
  isPlainObject,
  assertNonNull,
} = require('../src/index.js');

// 1. RuleCreator produces a rule creation helper that sets meta.docs.url using the provided url generator
const createRule = createRuleFactory('https://example.com/rules');
const rule = createRule({
  name: 'no-example-violation',
  meta: {
    docs: {
      description: 'Disallow example violations',
    },
    messages: {
      unexpected: 'Disallowed example pattern detected.',
    },
    type: 'problem',
    schema: [],
  },
  defaultOptions: [],
  create(context) {
    return {
      Identifier(node) {
        if (node.name === 'disallowed') {
          context.report({ node, messageId: 'unexpected' });
        }
      },
    };
  },
});

assert.ok(rule, 'Rule object should be created');
assert.strictEqual(rule.name, 'no-example-violation');
assert.strictEqual(typeof rule.create, 'function');
assert.strictEqual(
  rule.meta.docs.url,
  'https://example.com/rules/no-example-violation',
  'RuleCreator must generate meta.docs.url using the provided URL generator'
);
assert.strictEqual(rule.meta.messages.unexpected, 'Disallowed example pattern detected.');

// 2. applyDefault merges user rule options into default option tuples without mutating defaults
const defaultOptions = [{ checkComments: false, threshold: 10 }];
const userOptions = [{ checkComments: true }];
const mergedOptions = mergeRuleOptions(defaultOptions, userOptions);

assert.deepStrictEqual(
  mergedOptions,
  [{ checkComments: true, threshold: 10 }],
  'applyDefault must deeply merge user options over default option tuples'
);
assert.strictEqual(
  defaultOptions[0].checkComments,
  false,
  'applyDefault must not mutate the original default options'
);

// 3. deepMerge recursively merges nested configuration objects into a new object
const baseConfig = {
  settings: { env: 'production', debug: false },
  flags: { strict: true },
};
const overrideConfig = {
  settings: { debug: true, port: 8080 },
};
const mergedConfig = mergeConfigs(baseConfig, overrideConfig);

assert.deepStrictEqual(
  mergedConfig,
  {
    settings: { env: 'production', debug: true, port: 8080 },
    flags: { strict: true },
  },
  'deepMerge must combine nested properties correctly'
);
assert.strictEqual(
  baseConfig.settings.debug,
  false,
  'deepMerge must not mutate input objects'
);

// 4. isObjectNotArray returns true for plain objects and false for arrays, null, and primitives
assert.strictEqual(isPlainObject({}), true, 'Plain object should return true');
assert.strictEqual(isPlainObject({ key: 'value' }), true, 'Non-empty object should return true');
assert.strictEqual(isPlainObject([]), false, 'Array should return false');
assert.strictEqual(isPlainObject([1, 2, 3]), false, 'Populated array should return false');
assert.strictEqual(isPlainObject(null), false, 'null should return false');
assert.strictEqual(isPlainObject(undefined), false, 'undefined should return false');
assert.strictEqual(isPlainObject('string'), false, 'String primitive should return false');
assert.strictEqual(isPlainObject(123), false, 'Number primitive should return false');
assert.strictEqual(isPlainObject(true), false, 'Boolean primitive should return false');

// 5. nullThrows returns non-null values and throws Non-null Assertion Failed error when passed null or undefined
const validValue = { type: 'Program' };
assert.strictEqual(
  assertNonNull(validValue, 'Node should exist'),
  validValue,
  'nullThrows must return valid non-null value'
);
assert.strictEqual(
  assertNonNull(0, 'Numeric zero should be preserved'),
  0,
  'nullThrows must preserve falsy non-null values like 0'
);
assert.strictEqual(
  assertNonNull('', 'Empty string should be preserved'),
  '',
  'nullThrows must preserve empty string'
);

assert.throws(
  () => assertNonNull(null, 'Custom null reason'),
  {
    name: 'Error',
    message: 'Non-null Assertion Failed: Custom null reason',
  },
  'nullThrows must throw Error with formatted message for null'
);

assert.throws(
  () => assertNonNull(undefined, 'Custom undefined reason'),
  {
    name: 'Error',
    message: 'Non-null Assertion Failed: Custom undefined reason',
  },
  'nullThrows must throw Error with formatted message for undefined'
);

// 6. NullThrowsReasons provides standard diagnostic error messages including MissingParent and MissingToken
assert.strictEqual(
  ESLintUtils.NullThrowsReasons.MissingParent,
  'Expected node to have a parent.',
  'MissingParent reason must match standard message'
);

const missingTokenMsg = ESLintUtils.NullThrowsReasons.MissingToken(';', 'statement terminator');
assert.strictEqual(
  missingTokenMsg,
  'Expected to find a ; for the statement terminator.',
  'MissingToken reason formatter must format token and context correctly'
);

assert.throws(
  () => ESLintUtils.nullThrows(null, ESLintUtils.NullThrowsReasons.MissingParent),
  {
    name: 'Error',
    message: `Non-null Assertion Failed: ${ESLintUtils.NullThrowsReasons.MissingParent}`,
  },
  'nullThrows with NullThrowsReasons.MissingParent must format assertion error'
);

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

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