vite-node 2.1.9: ViteNodeServer

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.ViteNodeServer 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.ViteNodeServer

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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  "lockfileVersion": 3,
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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-server",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "vite-node": "2.1.9"
  }
}

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

import assert from 'node:assert/strict';
import fs from 'node:fs/promises';
import path from 'node:path';
import os from 'node:os';
import { createServer } from 'vite';
import { ViteNodeServer } from 'vite-node/server';

async function runContract() {
  const tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'vns-contract-'));
  try {
    const helperTs = path.join(tmpDir, 'helper.ts');
    const serviceTs = path.join(tmpDir, 'service.ts');

    await fs.writeFile(
      helperTs,
      `export const factor: number = 7;\n`
    );
    await fs.writeFile(
      serviceTs,
      `import { factor } from './helper';\nexport function calculate(input: number): number {\n  return input * factor + 3;\n}\n`
    );

    const viteServer = await createServer({
      root: tmpDir,
      server: { middlewareMode: true },
      appType: 'custom',
    });

    const nodeServer = new ViteNodeServer(viteServer, {
      sourcemap: true,
      deps: {
        inline: [/\.ts$/],
        external: ['node:path', 'node:fs'],
      },
      transformMode: {
        ssr: [/service\.ts/],
        web: [/helper\.ts/],
      },
    });

    // 1. ViteNodeServer initializes with a ViteDevServer instance and configurable options including sourcemap and transformMode
    assert.equal(nodeServer.server, viteServer);
    assert.equal(nodeServer.options.sourcemap, true);
    assert.ok(nodeServer.fetchCaches.ssr instanceof Map);
    assert.ok(nodeServer.fetchCaches.web instanceof Map);
    assert.ok(nodeServer.externalizeCache instanceof Map);

    // 2. ViteNodeServer resolves module specifiers and relative file paths against importer locations via resolveId
    const resolvedHelper = await nodeServer.resolveId('./helper', serviceTs);
    assert.ok(resolvedHelper, 'resolveId should return a resolve result');
    assert.ok(resolvedHelper.id.endsWith('helper.ts'), 'resolved ID should point to helper.ts');

    // 3. ViteNodeServer determines transform modes for module paths using configured web and ssr pattern matchers
    assert.equal(nodeServer.getTransformMode(serviceTs), 'ssr');
    assert.equal(nodeServer.getTransformMode(helperTs), 'web');

    // 4. ViteNodeServer transforms source modules into executable code and retains sourcemap metadata when configured via fetchModule and transformRequest
    const transformRes = await nodeServer.transformRequest(serviceTs);
    assert.ok(transformRes && typeof transformRes.code === 'string');
    assert.ok(transformRes.code.includes('calculate'));

    const fetchRes = await nodeServer.fetchModule(serviceTs);
    assert.ok(fetchRes && typeof fetchRes.code === 'string');
    assert.ok(fetchRes.code.includes('calculate'));
    assert.ok(fetchRes.map !== undefined, 'sourcemap should be retained when sourcemap option is true');

    // 5. ViteNodeServer requires web transformMode when transforming modules via transformModule and rejects unsupported modes
    const transModWeb = await nodeServer.transformModule(helperTs, 'web');
    assert.ok(transModWeb && typeof transModWeb.code === 'string');
    assert.ok(transModWeb.code.includes('factor'));

    await assert.rejects(
      async () => {
        await nodeServer.transformModule(serviceTs, 'ssr');
      },
      {
        name: 'Error',
        message: '`transformModule` only supports `transformMode: "web"`.',
      }
    );

    // 6. ViteNodeServer evaluates dependency externalization rules and caches externalized resolutions via shouldExternalize
    const extBuiltin = await nodeServer.shouldExternalize('node:path');
    assert.equal(extBuiltin, 'node:path');
    assert.equal(await nodeServer.externalizeCache.get('node:path'), 'node:path');

    const extLocal = await nodeServer.shouldExternalize(serviceTs);
    assert.equal(extLocal, false);

    // 7. ViteNodeServer caches fetched module entries and tracks cumulative execution durations via getTotalDuration
    assert.ok(nodeServer.fetchCaches.ssr.has(serviceTs), 'service.ts should be cached in ssr fetchCache');
    const duration = nodeServer.getTotalDuration();
    assert.ok(typeof duration === 'number' && duration >= 0);

    await viteServer.close();
    console.log('Contract tests passed successfully.');
  } finally {
    await fs.rm(tmpDir, { recursive: true, force: true });
  }
}

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