vite-node 2.1.9: shouldExternalize

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.shouldExternalize 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.shouldExternalize

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-vite-node-should-externalize",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification for vite-node.shouldExternalize",
  "license": "MIT-0",
  "dependencies": {
    "vite-node": "2.1.9"
  }
}

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

import assert from 'node:assert/strict';
import { shouldExternalize } from 'vite-node/server';

async function runContract() {
  // 1. shouldExternalize returns the module identifier for Node.js built-in modules
  const fsResult = await shouldExternalize('node:fs');
  assert.equal(fsResult, 'node:fs', 'Node.js builtin node:fs must be externalized');

  const pathResult = await shouldExternalize('path');
  assert.equal(pathResult, 'path', 'Node.js builtin path must be externalized');

  // 2. shouldExternalize returns the specifier for data URLs and network imports
  const dataUrl = 'data:text/javascript,export const answer = 42;';
  const dataResult = await shouldExternalize(dataUrl);
  assert.equal(dataResult, dataUrl, 'Data URLs must be externalized');

  const httpUrl = 'https://example.com/esm/module.mjs';
  const httpResult = await shouldExternalize(httpUrl);
  assert.equal(httpResult, httpUrl, 'Network imports must be externalized');

  // 3. shouldExternalize returns the path when explicitly matched by options.external patterns
  const externalResult = await shouldExternalize('/workspace/node_modules/sample-external-dep/index.js', {
    external: ['sample-external-dep']
  });
  assert.equal(
    externalResult,
    '/workspace/node_modules/sample-external-dep/index.js',
    'Explicitly externalized dependency must return file path'
  );

  // 4. shouldExternalize returns false when matched by options.inline patterns
  const inlineResult = await shouldExternalize('/workspace/node_modules/sample-inlined-dep/index.js', {
    inline: ['sample-inlined-dep']
  });
  assert.equal(inlineResult, false, 'Explicitly inlined dependency must return false');

  // 5. shouldExternalize returns false when the file path is explicitly listed in options.inlineFiles
  const inlineFile = '/workspace/src/custom-inline.js';
  const inlineFileResult = await shouldExternalize(inlineFile, {
    inlineFiles: [inlineFile]
  });
  assert.equal(inlineFileResult, false, 'Inline files list must return false');

  // 6. shouldExternalize returns false for non-library project source files
  const sourceResult = await shouldExternalize('/workspace/src/app.ts');
  assert.equal(sourceResult, false, 'Project source files outside node_modules must return false');

  // 7. shouldExternalize caches resolution results when a cache Map is provided
  const cache = new Map();
  const cachedResult = await shouldExternalize('node:os', {}, cache);
  assert.equal(cachedResult, 'node:os', 'Cached call should return correct result');
  assert.equal(cache.has('node:os'), true, 'Result promise must be stored in cache map');
  assert.equal(await cache.get('node:os'), 'node:os', 'Cached promise should resolve to result');

  console.log('Contract passed');
}

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