path-exists 4.0.0

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 pkg:npm/path-exists@4.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/path-exists@4.0.0
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - 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.

{"case":{"caseId":"case:sha256:d17de5b1428fd4c2c8e9daedcba2dfad906e264c4808f8ec3d6f25ec16444c56","constraints":{"executionContext":"node"},"contract":["pathExists asynchronously returns a Promise resolving to true for an existing file or directory and false for a non-existent path","pathExists.sync synchronously returns true for an existing file or directory and false for a non-existent path","pathExists handles non-existent paths gracefully returning false without throwing exceptions"],"goal":"verify pkg:npm/path-exists@4.0.0","kind":"HOW","packages":["pkg:npm/path-exists@4.0.0"],"schemaVersion":1},"contractCommand":["node","test/contract.cjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/path-exists@4.0.0"],"schemaVersion":1,"subject":"pkg:npm/path-exists@4.0.0","verifierAdapter":"node-typescript@1"}

'use strict';

const pathExists = require('path-exists');

async function checkPath(targetPath) {
  return await pathExists(targetPath);
}

function checkPathSync(targetPath) {
  return pathExists.sync(targetPath);
}

module.exports = {
  checkPath,
  checkPathSync,
  pathExists
};

{
  "name": "sample-path-exists",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-path-exists",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "path-exists": "4.0.0"
      }
    },
    "node_modules/path-exists": {
      "version": "4.0.0",
      "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
      "integrity": "sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w==",
      "license": "MIT",
      "engines": {
        "node": ">=8"
      }
    }
  }
}

{
  "name": "sample-path-exists",
  "version": "1.0.0",
  "private": true,
  "description": "Code sample verifying path-exists",
  "main": "index.js",
  "scripts": {
    "test": "node test/contract.cjs"
  },
  "dependencies": {
    "path-exists": "4.0.0"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/path-exists@4.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/path-exists@4.0.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "runtime": "node@22.23.2"
  }
}

'use strict';

const assert = require('assert');
const fs = require('fs');
const path = require('path');
const { checkPath, checkPathSync, pathExists } = require('../index.js');

async function run() {
  const tmpDir = path.join(__dirname, 'fixture-dir');
  const tmpFile = path.join(__dirname, 'fixture-file.txt');
  const nonExistentPath = path.join(__dirname, 'non-existent-path-' + Date.now());

  if (!fs.existsSync(tmpDir)) {
    fs.mkdirSync(tmpDir, { recursive: true });
  }
  fs.writeFileSync(tmpFile, 'sample content', 'utf8');

  try {
    // 1. Asynchronous pathExists
    const fileExistsAsync = await pathExists(tmpFile);
    assert.strictEqual(fileExistsAsync, true, 'pathExists must return true for existing file');

    const dirExistsAsync = await pathExists(tmpDir);
    assert.strictEqual(dirExistsAsync, true, 'pathExists must return true for existing directory');

    const missingExistsAsync = await pathExists(nonExistentPath);
    assert.strictEqual(missingExistsAsync, false, 'pathExists must return false for missing path');

    const helperExistsAsync = await checkPath(tmpFile);
    assert.strictEqual(helperExistsAsync, true, 'checkPath helper must return true for existing file');

    // 2. Synchronous pathExists.sync
    const fileExistsSync = pathExists.sync(tmpFile);
    assert.strictEqual(fileExistsSync, true, 'pathExists.sync must return true for existing file');

    const dirExistsSync = pathExists.sync(tmpDir);
    assert.strictEqual(dirExistsSync, true, 'pathExists.sync must return true for existing directory');

    const missingExistsSync = pathExists.sync(nonExistentPath);
    assert.strictEqual(missingExistsSync, false, 'pathExists.sync must return false for missing path');

    const helperExistsSync = checkPathSync(tmpFile);
    assert.strictEqual(helperExistsSync, true, 'checkPathSync helper must return true for existing file');

    // 3. Graceful handling of missing paths without throwing
    assert.doesNotThrow(() => {
      pathExists.sync(nonExistentPath);
    }, 'pathExists.sync should not throw on non-existent path');

    console.log('Contract tests passed successfully.');
  } finally {
    if (fs.existsSync(tmpFile)) {
      fs.unlinkSync(tmpFile);
    }
    if (fs.existsSync(tmpDir)) {
      fs.rmdirSync(tmpDir);
    }
  }
}

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