import-meta-resolve 4.2.0

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/import-meta-resolve@4.2.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/import-meta-resolve@4.2.0
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - 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:f554f5dbe0dae1abd9a08ad5ac82d2ea5f0532daada20b13a9c39af414ab3fbb","constraints":{"executionContext":"node"},"contract":["resolve resolves node built-in modules to node: URLs","resolve resolves installed package specifiers to file: URLs pointing to their entry points","resolve resolves relative module specifiers relative to parent URL","resolve throws ERR_MODULE_NOT_FOUND when package cannot be found","resolve throws ERR_INVALID_MODULE_SPECIFIER for invalid specifiers","moduleResolve returns URL object for relative specifiers and node builtins","moduleResolve throws ERR_MODULE_NOT_FOUND and ERR_INVALID_MODULE_SPECIFIER on resolution failure"],"goal":"verify pkg:npm/import-meta-resolve@4.2.0","kind":"HOW","packages":["pkg:npm/import-meta-resolve@4.2.0"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/import-meta-resolve@4.2.0"],"schemaVersion":1,"subject":"pkg:npm/import-meta-resolve@4.2.0","verifierAdapter":"node-typescript@1"}

{
  "name": "import-meta-resolve-sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "import-meta-resolve-sample",
      "version": "1.0.0",
      "dependencies": {
        "import-meta-resolve": "4.2.0"
      }
    },
    "node_modules/import-meta-resolve": {
      "version": "4.2.0",
      "resolved": "https://registry.npmjs.org/import-meta-resolve/-/import-meta-resolve-4.2.0.tgz",
      "integrity": "sha512-Iqv2fzaTQN28s/FwZAoFq0ZSs/7hMAHJVX+w8PZl3cY19Pxk6jFFalxQoIfW2826i/fDLXv8IiEZRIT0lDuWcg==",
      "license": "MIT",
      "funding": {
        "type": "github",
        "url": "https://github.com/sponsors/wooorm"
      }
    }
  }
}

{
  "name": "import-meta-resolve-sample",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification for import-meta-resolve",
  "type": "module",
  "dependencies": {
    "import-meta-resolve": "4.2.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/import-meta-resolve@4.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/import-meta-resolve@4.2.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert/strict';
import { resolve, moduleResolve } from 'import-meta-resolve';

// 1. resolve resolves node built-in modules to node: URLs
{
  const fsResolved = resolve('fs', import.meta.url);
  assert.strictEqual(fsResolved, 'node:fs');

  const pathResolved = resolve('node:path', import.meta.url);
  assert.strictEqual(pathResolved, 'node:path');
}

// 2. resolve resolves installed package specifiers to file: URLs pointing to their entry points
{
  const pkgResolved = resolve('import-meta-resolve', import.meta.url);
  assert.strictEqual(typeof pkgResolved, 'string');
  assert.ok(pkgResolved.startsWith('file:///'));
  assert.ok(pkgResolved.endsWith('/node_modules/import-meta-resolve/index.js'));
}

// 3. resolve resolves relative module specifiers relative to parent URL
{
  const relResolved = resolve('../package.json', import.meta.url);
  const expectedURL = new URL('../package.json', import.meta.url).href;
  assert.strictEqual(relResolved, expectedURL);
}

// 4. resolve throws ERR_MODULE_NOT_FOUND when package cannot be found
{
  assert.throws(
    () => {
      resolve('nonexistent-package-xyz-404', import.meta.url);
    },
    (err) => {
      return err.code === 'ERR_MODULE_NOT_FOUND';
    }
  );
}

// 5. resolve throws ERR_INVALID_MODULE_SPECIFIER for invalid specifiers
{
  assert.throws(
    () => {
      resolve('#', import.meta.url);
    },
    (err) => {
      return err.code === 'ERR_INVALID_MODULE_SPECIFIER';
    }
  );
}

// 6. moduleResolve returns URL object for relative specifiers and node builtins
{
  const parentURL = new URL(import.meta.url);

  const builtinURL = moduleResolve('node:fs', parentURL);
  assert.ok(builtinURL instanceof URL);
  assert.strictEqual(builtinURL.href, 'node:fs');

  const relURL = moduleResolve('../package.json', parentURL);
  assert.ok(relURL instanceof URL);
  assert.strictEqual(relURL.href, new URL('../package.json', parentURL).href);
}

// 7. moduleResolve throws ERR_MODULE_NOT_FOUND and ERR_INVALID_MODULE_SPECIFIER on resolution failure
{
  const parentURL = new URL(import.meta.url);

  assert.throws(
    () => {
      moduleResolve('nonexistent-package-xyz-404', parentURL);
    },
    (err) => {
      return err.code === 'ERR_MODULE_NOT_FOUND';
    }
  );

  assert.throws(
    () => {
      moduleResolve('#', parentURL);
    },
    (err) => {
      return err.code === 'ERR_INVALID_MODULE_SPECIFIER';
    }
  );
}

console.log('Contract passed');