jest-util 30.4.1: tryRealpath

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.tryRealpath 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.tryRealpath

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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{
  "name": "sample-jest-util-try-realpath",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of jest-util.tryRealpath in pkg:npm/jest-util@30.4.1",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "jest-util": "30.4.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify jest-util.tryRealpath in pkg:npm/jest-util@30.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-util@30.4.1"
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  "symbols": [
    "jest-util.tryRealpath"
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}

'use strict';

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

/**
 * Resolve the real canonical path of an existing file or directory,
 * or return the original path if it does not exist (ENOENT) or is EISDIR.
 *
 * @param {string} targetPath - The path to resolve.
 * @returns {string} The canonical real path, or the original path on ENOENT/EISDIR.
 */
function resolvePathSafely(targetPath) {
  return tryRealpath(targetPath);
}

/**
 * Check if a path can be resolved to a different canonical path (e.g. symlinks or relative paths).
 *
 * @param {string} targetPath - The path to check.
 * @returns {boolean} True if the canonical path differs from the input path.
 */
function isPathRedirected(targetPath) {
  const resolved = tryRealpath(targetPath);
  return resolved !== targetPath;
}

module.exports = {
  tryRealpath,
  resolvePathSafely,
  isPathRedirected,
};

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

const require = createRequire(import.meta.url);
const { tryRealpath, resolvePathSafely, isPathRedirected } = require('../src/index.js');
const jestUtil = require('jest-util');

async function runContract() {
  const testDir = fs.mkdtempSync(path.join(os.tmpdir(), 'jest-util-contract-'));
  const realTestDir = fs.realpathSync.native(testDir);

  try {
    // 1. Export verification
    assert.strictEqual(typeof jestUtil.tryRealpath, 'function', 'jest-util should export tryRealpath function');
    assert.strictEqual(tryRealpath, jestUtil.tryRealpath, 'src/index.js should re-export tryRealpath');

    // 2. Canonical real path resolution for existing file
    const filePath = path.join(testDir, 'sample-file.txt');
    fs.writeFileSync(filePath, 'contract test content', 'utf8');
    const realFilePath = fs.realpathSync.native(filePath);

    const resolvedFile = tryRealpath(filePath);
    assert.strictEqual(resolvedFile, realFilePath, 'tryRealpath should resolve canonical path of existing file');
    assert.strictEqual(resolvePathSafely(filePath), realFilePath, 'resolvePathSafely should return canonical path');

    // 3. Symbolic link resolution to canonical target
    const symlinkPath = path.join(testDir, 'symlink-to-file.txt');
    fs.symlinkSync(filePath, symlinkPath);

    const resolvedSymlink = tryRealpath(symlinkPath);
    assert.strictEqual(resolvedSymlink, realFilePath, 'tryRealpath should resolve symlink to target canonical path');
    assert.strictEqual(isPathRedirected(symlinkPath), true, 'symlink should be recognized as redirected');

    // 4. Directory path resolution
    const subDirPath = path.join(testDir, 'sub-directory');
    fs.mkdirSync(subDirPath);
    const realSubDirPath = fs.realpathSync.native(subDirPath);

    const resolvedDir = tryRealpath(subDirPath);
    assert.strictEqual(resolvedDir, realSubDirPath, 'tryRealpath should resolve canonical path of existing directory');

    // 5. Non-existent path returns original path without throwing (ENOENT handled safely)
    const nonExistentPath = path.join(testDir, 'non-existent-file.txt');
    const resolvedMissing = tryRealpath(nonExistentPath);
    assert.strictEqual(resolvedMissing, nonExistentPath, 'tryRealpath should return original path for non-existent file');

    // 6. Broken symlink returns original symlink path without throwing
    const brokenSymlink = path.join(testDir, 'broken-link.txt');
    fs.symlinkSync(path.join(testDir, 'does-not-exist.txt'), brokenSymlink);
    const resolvedBroken = tryRealpath(brokenSymlink);
    assert.strictEqual(resolvedBroken, brokenSymlink, 'tryRealpath should return broken symlink path when target is missing');

    // 7. Invalid argument types throw TypeError
    assert.throws(
      () => tryRealpath(12345),
      { name: 'TypeError' },
      'tryRealpath should throw TypeError for numeric input'
    );
    assert.throws(
      () => tryRealpath(null),
      { name: 'TypeError' },
      'tryRealpath should throw TypeError for null input'
    );

    console.log('All jest-util.tryRealpath contract assertions passed successfully.');
  } finally {
    fs.rmSync(testDir, { recursive: true, force: true });
  }
}

runContract().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});