vite-node 2.1.9: ViteNodeRunner

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.ViteNodeRunner 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.ViteNodeRunner
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:c6e2330fd6bb904f8855d647ab5d9c6149418631c7b0535f8584b4db880eabe5","constraints":{"executionContext":"node"},"contract":["ViteNodeRunner initializes with root directory, custom fetchModule, and an instance of ModuleCacheMap","ViteNodeRunner.executeId executes SSR-transformed JavaScript and returns exported properties and functions","ViteNodeRunner moduleCache caches executed modules and prevents redundant module fetches","ViteNodeRunner.executeId resolves inter-module dependencies via __vite_ssr_import__","ViteNodeRunner requestStubs intercept module requests and return configured stub objects directly","ViteNodeRunner.resolveUrl resolves relative module paths to URL and filesystem paths","ViteNodeRunner.shouldInterop detects default exports for CommonJS interop","ViteNodeRunner.executeId propagates runtime exceptions thrown during module evaluation"],"goal":"verify vite-node.ViteNodeRunner in pkg:npm/vite-node@2.1.9","kind":"HOW","packages":["pkg:npm/vite-node@2.1.9"],"schemaVersion":1,"symbols":["vite-node.ViteNodeRunner"]},"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/vite-node@2.1.9"],"schemaVersion":1,"subject":"pkg:npm/vite-node@2.1.9","symbols":["vite-node.ViteNodeRunner"],"verifierAdapter":"node-typescript@1"}

import { ViteNodeRunner, ModuleCacheMap } from 'vite-node/client';

export { ViteNodeRunner, ModuleCacheMap };
export default ViteNodeRunner;

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      "integrity": "sha512-AM9aQ/IPrW/6ENLQg3AGY4K1N2TGZdR5e4gu/MmmR2xR3Ll1+dib+nook92g4TV3PXVyeyxdWwtaCAiUL0hMxA==",
      "license": "MIT",
      "dependencies": {
        "cac": "^6.7.14",
        "debug": "^4.3.7",
        "es-module-lexer": "^1.5.4",
        "pathe": "^1.1.2",
        "vite": "^5.0.0"
      },
      "bin": {
        "vite-node": "vite-node.mjs"
      },
      "engines": {
        "node": "^18.0.0 || >=20.0.0"
      },
      "funding": {
        "url": "https://opencollective.com/vitest"
      }
    }
  }
}

{
  "name": "sample-vite-node-vitenoderunner",
  "version": "1.0.0",
  "description": "Clean-room sample verifying pkg:npm/vite-node@2.1.9 ViteNodeRunner functionality",
  "type": "module",
  "main": "index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "license": "MIT-0",
  "dependencies": {
    "vite-node": "2.1.9"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify vite-node.ViteNodeRunner in pkg:npm/vite-node@2.1.9",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vite-node@2.1.9"
  ],
  "symbols": [
    "vite-node.ViteNodeRunner"
  ],
  "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 { ViteNodeRunner, ModuleCacheMap } from '../index.mjs';

async function runContractTests() {
  const fetchedIds = [];
  const runner = new ViteNodeRunner({
    root: '/workspace',
    async fetchModule(id) {
      fetchedIds.push(id);
      if (id === '/virtual/math.js') {
        return {
          code: '__vite_ssr_exports__.value = 42; __vite_ssr_exports__.add = (a, b) => a + b;'
        };
      }
      if (id === '/virtual/consumer.js') {
        return {
          code: 'const dep = await __vite_ssr_import__("/virtual/math.js"); __vite_ssr_exports__.result = dep.add(dep.value, 8);'
        };
      }
      if (id === '/virtual/failing.js') {
        return {
          code: 'throw new RangeError("execution failed inside module");'
        };
      }
      return { code: '' };
    },
    requestStubs: {
      'virtual:stub': { stubbed: true, label: 'mocked-service' }
    }
  });

  // 1. ViteNodeRunner initializes with root directory, custom fetchModule, and an instance of ModuleCacheMap
  assert.ok(runner instanceof ViteNodeRunner, 'runner should be an instance of ViteNodeRunner');
  assert.ok(runner.moduleCache instanceof ModuleCacheMap, 'moduleCache should be an instance of ModuleCacheMap');
  assert.equal(runner.root, '/workspace', 'root should match the configured directory');

  // 2. ViteNodeRunner.executeId executes SSR-transformed JavaScript and returns exported properties and functions
  const mathMod = await runner.executeId('/virtual/math.js');
  assert.equal(mathMod.value, 42, 'mathMod.value should equal 42');
  assert.equal(typeof mathMod.add, 'function', 'mathMod.add should be a function');
  assert.equal(mathMod.add(10, 20), 30, 'mathMod.add(10, 20) should equal 30');
  assert.equal(fetchedIds.includes('/virtual/math.js'), true, 'math module should have been fetched');

  // 3. ViteNodeRunner moduleCache caches executed modules and prevents redundant module fetches
  const fetchCountBefore = fetchedIds.length;
  const cachedMath = await runner.executeId('/virtual/math.js');
  assert.equal(cachedMath.value, 42, 'cachedMath should return the same export values');
  assert.equal(fetchedIds.length, fetchCountBefore, 'fetchModule should not be called again for cached module');
  const cacheEntry = runner.moduleCache.get('/virtual/math.js');
  assert.ok(cacheEntry, 'cacheEntry should be present in moduleCache');
  assert.equal(cacheEntry.exports.value, 42, 'cacheEntry exports should match');

  // 4. ViteNodeRunner.executeId resolves inter-module dependencies via __vite_ssr_import__
  const consumerMod = await runner.executeId('/virtual/consumer.js');
  assert.equal(consumerMod.result, 50, 'consumerMod should import math module and calculate result 50');

  // 5. ViteNodeRunner requestStubs intercept module requests and return configured stub objects directly
  const stubMod = await runner.executeId('virtual:stub');
  assert.equal(stubMod.stubbed, true, 'stubMod should have stubbed flag set');
  assert.equal(stubMod.label, 'mocked-service', 'stubMod should retain stubbed properties');

  // 6. ViteNodeRunner.resolveUrl resolves relative module paths to URL and filesystem paths
  const [resolvedUrl, resolvedFsPath] = await runner.resolveUrl('./helper.js', '/workspace/src/index.js');
  assert.equal(typeof resolvedUrl, 'string', 'resolvedUrl should be a string');
  assert.equal(typeof resolvedFsPath, 'string', 'resolvedFsPath should be a string');
  assert.ok(resolvedFsPath.includes('helper.js'), 'resolvedFsPath should contain helper.js');

  // 7. ViteNodeRunner.shouldInterop detects default exports for CommonJS interop
  assert.equal(runner.shouldInterop('mod-with-default', { default: { name: 'pkg' } }), true, 'shouldInterop should return true when default export is present');
  assert.equal(runner.shouldInterop('mod-without-default', { namedExport: 123 }), false, 'shouldInterop should return false when default export is missing');

  // 8. ViteNodeRunner.executeId propagates runtime exceptions thrown during module evaluation
  await assert.rejects(
    async () => runner.executeId('/virtual/failing.js'),
    {
      name: 'RangeError',
      message: 'execution failed inside module'
    },
    'executeId should propagate RangeError thrown inside the module'
  );

  console.log('All 8 contract assertions passed successfully.');
}

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