jest-util 30.4.1: globsToMatcher

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 jest-util.globsToMatcher in pkg:npm/jest-util@30.4.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/jest-util@30.4.1
Demonstrate these symbols/APIs:
  - jest-util.globsToMatcher
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.

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  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for jest-util.globsToMatcher",
  "main": "src/index.js",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "jest-util": "30.4.1"
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}

'use strict';

const { globsToMatcher } = require('jest-util');

/**
 * Creates a glob matcher function using jest-util globsToMatcher.
 *
 * @param {Array<string>} globs - Array of glob patterns.
 * @param {object} [options] - Optional picomatch options.
 * @returns {(path: string) => boolean} Matcher function.
 */
function createMatcher(globs, options) {
  return globsToMatcher(globs, options);
}

module.exports = {
  globsToMatcher,
  createMatcher
};

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const { globsToMatcher, createMatcher } = require('../src/index.js');

// 1. globsToMatcher returns a matcher function that evaluates to false for any path when the globs array is empty
{
  const matcher = globsToMatcher([]);
  assert.equal(typeof matcher, 'function');
  assert.equal(matcher('src/index.js'), false);
  assert.equal(matcher('test.txt'), false);
  assert.equal(matcher(''), false);
}

// 2. globsToMatcher matches paths satisfying a positive glob pattern and rejects non-matching paths
{
  const matcher = globsToMatcher(['**/*.js']);
  assert.equal(typeof matcher, 'function');
  assert.equal(matcher('src/index.js'), true);
  assert.equal(matcher('src/index.ts'), false);
  assert.equal(matcher('README.md'), false);
}

// 3. globsToMatcher matches paths when any pattern in a multi-pattern positive glob list matches
{
  const matcher = createMatcher(['**/*.js', '**/*.ts']);
  assert.equal(typeof matcher, 'function');
  assert.equal(matcher('src/app.js'), true);
  assert.equal(matcher('src/app.ts'), true);
  assert.equal(matcher('src/app.json'), false);
}

// 4. globsToMatcher matches dotfiles by default when no custom picomatch options are provided
{
  const matcher = globsToMatcher(['**/*']);
  assert.equal(typeof matcher, 'function');
  assert.equal(matcher('.gitignore'), true);
  assert.equal(matcher('.github/workflows/ci.yml'), true);
}

// 5. globsToMatcher respects custom picomatch options such as disabling dotfile matching
{
  const matcher = globsToMatcher(['*'], { dot: false });
  assert.equal(typeof matcher, 'function');
  assert.equal(matcher('.gitignore'), false);
  assert.equal(matcher('index.js'), true);
}

// 6. globsToMatcher normalizes Windows backslash path separators when evaluating paths against patterns
{
  const matcher = globsToMatcher(['src/**/*.js']);
  assert.equal(typeof matcher, 'function');
  assert.equal(matcher('src\\components\\Button.js'), true);
  assert.equal(matcher('src\\components\\Button.ts'), false);
}

// 7. globsToMatcher filters out paths matching negative glob patterns when combined with positive glob patterns
{
  const matcher = globsToMatcher(['**/*.js', '!**/*.test.js']);
  assert.equal(typeof matcher, 'function');
  assert.equal(matcher('src/utils.js'), true);
  assert.equal(matcher('src/utils.test.js'), false);
}

// 8. globsToMatcher includes all paths that are not excluded when only negative glob patterns are specified
{
  const matcher = globsToMatcher(['!**/*.tmp', '!**/*.cache']);
  assert.equal(typeof matcher, 'function');
  assert.equal(matcher('src/index.js'), true);
  assert.equal(matcher('build/output.tmp'), false);
  assert.equal(matcher('.cache'), false);
}

console.log('All jest-util.globsToMatcher contract assertions passed.');