graceful-fs 4.2.11: existsSync

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 graceful-fs.existsSync in pkg:npm/graceful-fs@4.2.11
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/graceful-fs@4.2.11
Demonstrate these symbols/APIs:
  - graceful-fs.existsSync

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:sha256:90cce5a377a1c40ee76a2a38314ba9ec6503a28820a14fabea01d7dabeb6849d","contract":["graceful-fs.existsSync(path) returns true when the target file exists","graceful-fs.existsSync(path) returns true when the target directory exists","graceful-fs.existsSync(nonExistentPath) returns false when the path does not exist","graceful-fs.existsSync(url) accepts a file URL object and returns true for an existing target","graceful-fs.existsSync(buffer) accepts a Buffer path and returns true for an existing target"],"goal":"verify graceful-fs.existsSync in pkg:npm/graceful-fs@4.2.11","kind":"HOW","packages":["pkg:npm/graceful-fs@4.2.11"],"schemaVersion":1,"symbols":["graceful-fs.existsSync"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/graceful-fs@4.2.11"],"schemaVersion":1,"subject":"pkg:npm/graceful-fs@4.2.11","symbols":["graceful-fs.existsSync"],"verifierAdapter":"node-typescript@1"}

import gracefulFs from 'graceful-fs';

/**
 * Checks synchronously whether a given file or directory path exists.
 *
 * @param {string|Buffer|URL} path - Path to file or directory.
 * @returns {boolean} True if the path exists, false otherwise.
 */
export function checkPathExists(path) {
  return gracefulFs.existsSync(path);
}

/**
 * Checks synchronously whether a given directory exists.
 *
 * @param {string|Buffer|URL} dirPath - Path to directory.
 * @returns {boolean} True if the directory exists, false otherwise.
 */
export function checkDirectoryExists(dirPath) {
  return gracefulFs.existsSync(dirPath);
}

export { gracefulFs };
export default gracefulFs;

{
  "name": "sample-graceful-fs-existssync",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-graceful-fs-existssync",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "graceful-fs": "4.2.11"
      }
    },
    "node_modules/graceful-fs": {
      "version": "4.2.11",
      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.11.tgz",
      "integrity": "sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==",
      "license": "ISC"
    }
  }
}

{
  "name": "sample-graceful-fs-existssync",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "graceful-fs": "4.2.11"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify graceful-fs.existsSync in pkg:npm/graceful-fs@4.2.11",
  "kind": "HOW",
  "packages": [
    "pkg:npm/graceful-fs@4.2.11"
  ],
  "symbols": [
    "graceful-fs.existsSync"
  ]
}

import assert from 'node:assert/strict';
import { fileURLToPath, pathToFileURL } from 'node:url';
import path from 'node:path';
import gracefulFs from 'graceful-fs';
import { checkPathExists, checkDirectoryExists } from '../index.mjs';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const fixtureFile = path.join(__dirname, 'fixture.txt');
const fixtureDir = __dirname;
const nonExistentFile = path.join(__dirname, 'non_existent_file_98765.txt');

// Verify export and function type
assert.equal(typeof gracefulFs.existsSync, 'function', 'gracefulFs.existsSync should be a function');

// 1. graceful-fs.existsSync(path) returns true when the target file exists
{
  const result = gracefulFs.existsSync(fixtureFile);
  assert.equal(typeof result, 'boolean');
  assert.equal(result, true);

  const helperResult = checkPathExists(fixtureFile);
  assert.equal(helperResult, true);
}

// 2. graceful-fs.existsSync(path) returns true when the target directory exists
{
  const result = gracefulFs.existsSync(fixtureDir);
  assert.equal(typeof result, 'boolean');
  assert.equal(result, true);

  const helperResult = checkDirectoryExists(fixtureDir);
  assert.equal(helperResult, true);
}

// 3. graceful-fs.existsSync(nonExistentPath) returns false when the path does not exist
{
  const result = gracefulFs.existsSync(nonExistentFile);
  assert.equal(typeof result, 'boolean');
  assert.equal(result, false);

  const helperResult = checkPathExists(nonExistentFile);
  assert.equal(helperResult, false);
}

// 4. graceful-fs.existsSync(url) accepts a file URL object and returns true for an existing target
{
  const fileUrl = pathToFileURL(fixtureFile);
  const result = gracefulFs.existsSync(fileUrl);
  assert.equal(typeof result, 'boolean');
  assert.equal(result, true);

  const helperResult = checkPathExists(fileUrl);
  assert.equal(helperResult, true);
}

// 5. graceful-fs.existsSync(buffer) accepts a Buffer path and returns true for an existing target
{
  const bufferPath = Buffer.from(fixtureFile);
  const result = gracefulFs.existsSync(bufferPath);
  assert.equal(typeof result, 'boolean');
  assert.equal(result, true);

  const helperResult = checkPathExists(bufferPath);
  assert.equal(helperResult, true);
}

console.log('Contract assertions passed successfully.');

Hello CodeSampleX graceful-fs existsSync verification!