jest-haste-map 29.7.0: crawl files and build haste map with JestHasteMap

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: crawl files and build haste map with JestHasteMap
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/jest-haste-map@29.7.0
Demonstrate these symbols/APIs:
  - HasteMap.build
  - HasteMap.create

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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  "lockfileVersion": 3,
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{
  "name": "sample-jest-haste-map-crawl",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of jest-haste-map crawling and indexing",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "jest-haste-map": "29.7.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "crawl files and build haste map with JestHasteMap",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-haste-map@29.7.0"
  ],
  "symbols": [
    "HasteMap.build",
    "HasteMap.create"
  ]
}

const HasteMapPkg = require('jest-haste-map');

const HasteMap = HasteMapPkg.default || HasteMapPkg;

/**
 * Creates and initializes a HasteMap instance for file crawling and indexing.
 * @param {object} options
 * @param {string} options.rootDir - Root directory of the project.
 * @param {string[]} [options.roots] - Directories to crawl.
 * @param {string[]} [options.extensions] - File extensions to index.
 * @param {number} [options.maxWorkers] - Number of worker threads.
 * @param {string} [options.name] - Cache identifier name.
 * @returns {Promise<object>} HasteMap instance.
 */
async function createHasteMap(options) {
  const {
    rootDir,
    roots = [rootDir],
    extensions = ['js', 'json', 'ts'],
    maxWorkers = 1,
    name = 'haste-crawler'
  } = options;

  return HasteMap.create({
    extensions,
    maxWorkers,
    name,
    platforms: [],
    rootDir,
    roots,
    useWatchman: false,
    watch: false
  });
}

/**
 * Crawls the directory structure and builds the Haste file system and module map.
 * @param {object} hasteMap - HasteMap instance.
 * @returns {Promise<{hasteFS: object, moduleMap: object}>}
 */
async function buildHasteMap(hasteMap) {
  return hasteMap.build();
}

module.exports = {
  HasteMap,
  createHasteMap,
  buildHasteMap
};

import { strict as assert } from 'node:assert';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const { HasteMap, createHasteMap, buildHasteMap } = require('../src/index.js');

// 1. Export verification
assert.strictEqual(typeof HasteMap.create, 'function', 'HasteMap.create must be a function');
assert.strictEqual(typeof createHasteMap, 'function', 'createHasteMap must be a function');
assert.strictEqual(typeof buildHasteMap, 'function', 'buildHasteMap must be a function');

// 2. Create isolated temporary workspace for indexing
const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'haste-sample-'));

try {
  const subDir = path.join(tempDir, 'src');
  fs.mkdirSync(subDir, { recursive: true });

  const fileAlpha = path.join(subDir, 'alpha.js');
  const fileBeta = path.join(subDir, 'beta.ts');
  const fileConfig = path.join(tempDir, 'config.json');

  fs.writeFileSync(fileAlpha, 'module.exports = { name: "alpha" };\n');
  fs.writeFileSync(fileBeta, 'export const beta = 100;\n');
  fs.writeFileSync(fileConfig, '{"enabled": true}\n');

  // 3. Create HasteMap instance
  const hasteMap = await createHasteMap({
    rootDir: tempDir,
    roots: [tempDir],
    extensions: ['js', 'ts', 'json'],
    maxWorkers: 1,
    name: 'contract-test-map'
  });

  assert.strictEqual(typeof hasteMap.build, 'function', 'hasteMap instance must have build method');

  // 4. Build file map and module map
  const { hasteFS, moduleMap } = await buildHasteMap(hasteMap);

  assert.ok(hasteFS, 'hasteFS must be defined');
  assert.ok(moduleMap, 'moduleMap must be defined');

  // 5. Query indexed files
  const allFiles = hasteFS.getAllFiles();
  assert.strictEqual(allFiles.length, 3, 'hasteFS must index all 3 created files');

  assert.strictEqual(hasteFS.exists(fileAlpha), true, 'fileAlpha should exist in hasteFS');
  assert.strictEqual(hasteFS.exists(fileBeta), true, 'fileBeta should exist in hasteFS');
  assert.strictEqual(hasteFS.exists(fileConfig), true, 'fileConfig should exist in hasteFS');

  const nonExistent = path.join(tempDir, 'gamma.js');
  assert.strictEqual(hasteFS.exists(nonExistent), false, 'nonExistent file should not exist in hasteFS');

  // 6. Match files by pattern
  const tsFiles = hasteFS.matchFiles(/\.ts$/);
  assert.strictEqual(tsFiles.length, 1, 'should find exactly 1 TypeScript file');
  assert.strictEqual(tsFiles[0], fileBeta, 'matched file must match fileBeta');

  const jsonFiles = hasteFS.matchFiles(/\.json$/);
  assert.strictEqual(jsonFiles.length, 1, 'should find exactly 1 JSON file');
  assert.strictEqual(jsonFiles[0], fileConfig, 'matched file must match fileConfig');

  console.log('CONTRACT PASS: HasteMap successfully created, crawled files, and built hasteFS');
} finally {
  fs.rmSync(tempDir, { recursive: true, force: true });
}