vite-node 2.1.9: isNodeBuiltin

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 vite-node.isNodeBuiltin in pkg:npm/vite-node@2.1.9
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vite-node@2.1.9
Demonstrate these symbols/APIs:
  - vite-node.isNodeBuiltin

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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        "node": "^18.0.0 || >=20.0.0"
      },
      "funding": {
        "url": "https://opencollective.com/vitest"
      }
    }
  }
}

{
  "name": "sample-vite-node",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "vite-node": "2.1.9"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify vite-node.isNodeBuiltin in pkg:npm/vite-node@2.1.9",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vite-node@2.1.9"
  ],
  "symbols": [
    "vite-node.isNodeBuiltin"
  ]
}

import assert from 'node:assert/strict';
import { isNodeBuiltin } from 'vite-node/utils';

function runContract() {
  // 1. isNodeBuiltin is a function exported from vite-node/utils
  assert.equal(
    typeof isNodeBuiltin,
    'function',
    'isNodeBuiltin must be a function exported from vite-node/utils'
  );

  // 2. isNodeBuiltin returns true for standard Node.js built-in module names with or without the node: prefix
  const standardBuiltins = [
    'fs',
    'path',
    'crypto',
    'os',
    'util',
    'events',
    'buffer',
    'stream',
    'http',
    'https',
    'child_process'
  ];
  for (const name of standardBuiltins) {
    assert.equal(
      isNodeBuiltin(name),
      true,
      `Expected ${name} to be recognized as Node builtin`
    );
    assert.equal(
      isNodeBuiltin(`node:${name}`),
      true,
      `Expected node:${name} to be recognized as Node builtin`
    );
  }

  // 3. isNodeBuiltin returns true for subpath builtins and prefixed-only builtins
  const subpathAndPrefixedBuiltins = [
    'fs/promises',
    'path/posix',
    'path/win32',
    'stream/promises',
    'stream/web',
    'timers/promises',
    'node:test'
  ];
  for (const name of subpathAndPrefixedBuiltins) {
    assert.equal(
      isNodeBuiltin(name),
      true,
      `Expected ${name} to be recognized as Node builtin`
    );
  }

  // 4. isNodeBuiltin returns false for external packages, relative paths, and non-builtin identifiers
  const nonBuiltins = [
    'vite-node',
    'vite',
    'express',
    'lodash',
    './utils.mjs',
    '../index.js',
    'my-package',
    'node',
    '',
    'random-custom-pkg'
  ];
  for (const id of nonBuiltins) {
    assert.equal(
      isNodeBuiltin(id),
      false,
      `Expected ${id} to NOT be recognized as Node builtin`
    );
  }

  console.log('Contract tests passed successfully.');
}

runContract();