vite 5.4.14

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 pkg:npm/vite@5.4.14
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vite@5.4.14

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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  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-vite",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
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      }
    },
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}

{
  "name": "sample-vite",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "vite": "5.4.14"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/vite@5.4.14",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vite@5.4.14"
  ]
}

import assert from 'node:assert/strict';
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { loadEnv } from 'vite';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const fixtureDir = path.resolve(__dirname, 'fixtures');

function setupFixtures() {
  fs.rmSync(fixtureDir, { recursive: true, force: true });
  fs.mkdirSync(fixtureDir, { recursive: true });

  // Base .env
  fs.writeFileSync(
    path.join(fixtureDir, '.env'),
    [
      'VITE_APP_NAME=SampleVite',
      'VITE_API_URL=https://example.com/api',
      'CUSTOM_API_KEY=custom-key-xyz',
      'UNPREFIXED_SECRET=secret-value'
    ].join('\n')
  );

  // Mode-specific .env.staging
  fs.writeFileSync(
    path.join(fixtureDir, '.env.staging'),
    [
      'VITE_API_URL=https://staging.example.com/api',
      'VITE_STAGING_MODE=true'
    ].join('\n')
  );

  // Local override .env.staging.local
  fs.writeFileSync(
    path.join(fixtureDir, '.env.staging.local'),
    [
      'VITE_API_URL=https://staging-local.example.com/api'
    ].join('\n')
  );
}

function cleanupFixtures() {
  if (fs.existsSync(fixtureDir)) {
    fs.rmSync(fixtureDir, { recursive: true, force: true });
  }
}

async function testContract() {
  setupFixtures();
  try {
    // 1. loadEnv is exported as a named function from vite
    assert.equal(typeof loadEnv, 'function');
    assert.equal(loadEnv.name, 'loadEnv');

    // 2. loadEnv loads mode-specific environment variables with default VITE_ prefix from .env files
    const defaultEnv = loadEnv('development', fixtureDir);
    assert.equal(defaultEnv.VITE_APP_NAME, 'SampleVite');
    assert.equal(defaultEnv.VITE_API_URL, 'https://example.com/api');
    assert.equal(defaultEnv.CUSTOM_API_KEY, undefined);
    assert.equal(defaultEnv.UNPREFIXED_SECRET, undefined);

    // 3. loadEnv overrides base .env values with mode-specific .env.[mode] configurations
    const stagingEnv = loadEnv('staging', fixtureDir);
    assert.equal(stagingEnv.VITE_APP_NAME, 'SampleVite');
    assert.equal(stagingEnv.VITE_STAGING_MODE, 'true');

    // 4. loadEnv prioritizes .env.[mode].local overrides over un-suffixed mode environment files
    assert.equal(stagingEnv.VITE_API_URL, 'https://staging-local.example.com/api');

    // 5. loadEnv filters environment variables using single custom prefix or array of prefixes
    const customSinglePrefix = loadEnv('development', fixtureDir, 'CUSTOM_');
    assert.equal(customSinglePrefix.CUSTOM_API_KEY, 'custom-key-xyz');
    assert.equal(customSinglePrefix.VITE_APP_NAME, undefined);

    const multiplePrefixes = loadEnv('development', fixtureDir, ['VITE_', 'CUSTOM_']);
    assert.equal(multiplePrefixes.VITE_APP_NAME, 'SampleVite');
    assert.equal(multiplePrefixes.CUSTOM_API_KEY, 'custom-key-xyz');
    assert.equal(multiplePrefixes.UNPREFIXED_SECRET, undefined);

    // 6. loadEnv loads all variables without filtering when prefix is configured as empty string
    const allEnv = loadEnv('development', fixtureDir, '');
    assert.equal(allEnv.VITE_APP_NAME, 'SampleVite');
    assert.equal(allEnv.CUSTOM_API_KEY, 'custom-key-xyz');
    assert.equal(allEnv.UNPREFIXED_SECRET, 'secret-value');

    // 7. loadEnv returns an empty object when target directory contains no env files
    const emptyDir = path.resolve(__dirname, 'empty-test-dir');
    fs.mkdirSync(emptyDir, { recursive: true });
    try {
      const emptyResult = loadEnv('development', emptyDir);
      assert.deepEqual(emptyResult, {});
    } finally {
      fs.rmdirSync(emptyDir);
    }
  } finally {
    cleanupFixtures();
  }
}

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