vite-node 2.1.9: CSS_LANGS_RE

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.CSS_LANGS_RE 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.CSS_LANGS_RE

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:sha256:12c501a783551999b33d758ddf493b7a0e5b6fec718fd5dfac5f85f0eaaea9bb","constraints":{"executionContext":"node"},"contract":["CSS_LANGS_RE is exported from vite-node/constants as a RegExp instance matching stylesheet file patterns","CSS_LANGS_RE matches standard stylesheet file extensions including css, less, sass, scss, styl, stylus, pcss, postcss, and sss","CSS_LANGS_RE matches stylesheet file paths containing URL query parameters and query strings","CSS_LANGS_RE rejects non-stylesheet file extensions including js, ts, jsx, tsx, json, png, and html","CSS_LANGS_RE rejects non-extension occurrences and embedded substring matches in file names"],"goal":"verify vite-node.CSS_LANGS_RE in pkg:npm/vite-node@2.1.9","kind":"HOW","packages":["pkg:npm/vite-node@2.1.9"],"schemaVersion":1,"symbols":["vite-node.CSS_LANGS_RE"]},"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.CSS_LANGS_RE"],"verifierAdapter":"node-typescript@1"}

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  "requires": true,
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    "": {
      "name": "sample-vite-node-css-langs-re",
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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-css-langs-re",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "vite-node": "2.1.9"
  }
}

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

import assert from 'node:assert/strict';
import { CSS_LANGS_RE } from 'vite-node/constants';

async function runContract() {
  // 1. CSS_LANGS_RE is exported from vite-node/constants as a RegExp instance matching stylesheet file patterns
  assert.ok(CSS_LANGS_RE instanceof RegExp, 'CSS_LANGS_RE must be an instance of RegExp');
  assert.equal(
    CSS_LANGS_RE.source,
    '\\.(css|less|sass|scss|styl|stylus|pcss|postcss|sss)(?:$|\\?)',
    'CSS_LANGS_RE should match expected regular expression source'
  );

  // 2. Matches standard stylesheet file extensions
  const validExtensions = [
    'css',
    'less',
    'sass',
    'scss',
    'styl',
    'stylus',
    'pcss',
    'postcss',
    'sss',
  ];

  for (const ext of validExtensions) {
    assert.ok(
      CSS_LANGS_RE.test(`style.${ext}`),
      `CSS_LANGS_RE should match .${ext} extension`
    );
    assert.ok(
      CSS_LANGS_RE.test(`/virtual/path/to/theme.${ext}`),
      `CSS_LANGS_RE should match path ending in .${ext}`
    );
    assert.ok(
      CSS_LANGS_RE.test(`component.module.${ext}`),
      `CSS_LANGS_RE should match css module style naming for .${ext}`
    );
  }

  // 3. Matches stylesheet file paths containing URL query parameters
  const queryCases = [
    'src/style.css?inline',
    'src/global.scss?direct',
    'src/theme.less?vue&type=style&index=0',
    'components/panel.pcss?raw',
    'styles/app.stylus?used',
    'styles/layout.sss?module',
  ];

  for (const uri of queryCases) {
    assert.ok(
      CSS_LANGS_RE.test(uri),
      `CSS_LANGS_RE should match stylesheet path with query string: ${uri}`
    );
  }

  // 4. Rejects non-stylesheet file extensions
  const invalidFiles = [
    'index.js',
    'index.mjs',
    'index.cjs',
    'main.ts',
    'component.tsx',
    'view.jsx',
    'data.json',
    'graphic.png',
    'icon.svg',
    'page.html',
    'app.vue',
    'module.wasm',
  ];

  for (const file of invalidFiles) {
    assert.equal(
      CSS_LANGS_RE.test(file),
      false,
      `CSS_LANGS_RE must not match non-stylesheet file: ${file}`
    );
  }

  // 5. Rejects non-extension occurrences and embedded substring matches
  const nonExtensionCases = [
    'css_helper.js',
    'sass_compiler.ts',
    'less-loader.mjs',
    'postcss.config.js',
    'stylus-theme.json',
    'notcss',
    'mysass',
  ];

  for (const file of nonExtensionCases) {
    assert.equal(
      CSS_LANGS_RE.test(file),
      false,
      `CSS_LANGS_RE must not match embedded substring: ${file}`
    );
  }

  console.log('Contract assertions for vite-node.CSS_LANGS_RE passed successfully.');
}

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