CodeSampleX

Sample

vite-node 2.1.9: ViteNodeServer

Verified sample for npm vite-node 2.1.9: ViteNodeServer. The contract ran on node 22 · linux debian/x64 · docker and passed: ViteNodeServer initializes with…

sha256:4967e75fc0d82925be024701027fc7286698ee7a787020a86891ac221d2bb1df

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-07

Case

HOW
Goal
verify vite-node.ViteNodeServer in pkg:npm/vite-node@2.1.9
Packages
Symbols
  • vite-node.ViteNodeServer
Environment
node 22.23.2
Created
2026-09-07T01:34:26Z

Contract

  1. ViteNodeServer initializes with a ViteDevServer instance and configurable options including sourcemap and transformMode
  2. ViteNodeServer resolves module specifiers and relative file paths against importer locations via resolveId
  3. ViteNodeServer determines transform modes for module paths using configured web and ssr pattern matchers
  4. ViteNodeServer transforms source modules into executable code and retains sourcemap metadata when configured via fetchModule and transformRequest
  5. ViteNodeServer requires web transformMode when transforming modules via transformModule and rejects unsupported modes
  6. ViteNodeServer evaluates dependency externalization rules and caches externalized resolutions via shouldExternalize
  7. ViteNodeServer caches fetched module entries and tracks cumulative execution durations via getTotalDuration

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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.
csx.json
{"case":{"caseId":"case:sha256:ea8c12d66e831f7f48e5a00980d37837ef6e3c7384c799ed9fe596035b81c1cd","constraints":{"executionContext":"node"},"contract":["ViteNodeServer initializes with a ViteDevServer instance and configurable options including sourcemap and transformMode","ViteNodeServer resolves module specifiers and relative file paths against importer locations via resolveId","ViteNodeServer determines transform modes for module paths using configured web and ssr pattern matchers","ViteNodeServer transforms source modules into executable code and retains sourcemap metadata when configured via fetchModule and transformRequest","ViteNodeServer requires web transformMode when transforming modules via transformModule and rejects unsupported modes","ViteNodeServer evaluates dependency externalization rules and caches externalized resolutions via shouldExternalize","ViteNodeServer caches fetched module entries and tracks cumulative execution durations via getTotalDuration"],"goal":"verify vite-node.ViteNodeServer in pkg:npm/vite-node@2.1.9","kind":"HOW","packages":["pkg:npm/vite-node@2.1.9"],"schemaVersion":1,"symbols":["vite-node.ViteNodeServer"]},"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.ViteNodeServer"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "sample-vite-node-server",
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      "resolved": "https://registry.npmjs.org/vite/-/vite-5.4.21.tgz",
      "integrity": "sha512-o5a9xKjbtuhY6Bi5S3+HvbRERmouabWbyUcpXXUA1u+GNUKoROi9byOJ8M0nHbHYHkYICiMlqxkg1KkYmm25Sw==",
      "license": "MIT",
      "dependencies": {
        "esbuild": "^0.21.3",
        "postcss": "^8.4.43",
        "rollup": "^4.20.0"
      },
      "bin": {
        "vite": "bin/vite.js"
      },
      "engines": {
        "node": "^18.0.0 || >=20.0.0"
      },
      "funding": {
        "url": "https://github.com/vitejs/vite?sponsor=1"
      },
      "optionalDependencies": {
        "fsevents": "~2.3.3"
      },
      "peerDependencies": {
        "@types/node": "^18.0.0 || >=20.0.0",
        "less": "*",
        "lightningcss": "^1.21.0",
        "sass": "*",
        "sass-embedded": "*",
        "stylus": "*",
        "sugarss": "*",
        "terser": "^5.4.0"
      },
      "peerDependenciesMeta": {
        "@types/node": {
          "optional": true
        },
        "less": {
          "optional": true
        },
        "lightningcss": {
          "optional": true
        },
        "sass": {
          "optional": true
        },
        "sass-embedded": {
          "optional": true
        },
        "stylus": {
          "optional": true
        },
        "sugarss": {
          "optional": true
        },
        "terser": {
          "optional": true
        }
      }
    },
    "node_modules/vite-node": {
      "version": "2.1.9",
      "resolved": "https://registry.npmjs.org/vite-node/-/vite-node-2.1.9.tgz",
      "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"
      }
    }
  }
}
package.json
{
  "name": "sample-vite-node-server",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "vite-node": "2.1.9"
  }
}
spec.json
{
  "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"
  ]
}
test/contract.mjs
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);
});

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