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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{
  "name": "sample-vite",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-vite",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "vite": "5.4.14"
      }
    },
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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 { mergeConfig } from 'vite';

async function testContract() {
  // 1. mergeConfig deeply merges nested configuration objects while later primitive options override earlier ones
  const config1 = {
    root: './src',
    base: '/app/',
    build: {
      target: 'es2020',
      sourcemap: false,
      outDir: 'dist'
    },
    define: {
      __DEV__: true,
      __VERSION__: '"1.0.0"'
    }
  };
  const config2 = {
    base: '/custom/',
    build: {
      sourcemap: true,
      minify: 'esbuild'
    },
    define: {
      __VERSION__: '"1.0.1"',
      __PROD__: false
    }
  };
  const merged = mergeConfig(config1, config2);
  assert.equal(merged.root, './src');
  assert.equal(merged.base, '/custom/');
  assert.equal(merged.build.target, 'es2020');
  assert.equal(merged.build.outDir, 'dist');
  assert.equal(merged.build.sourcemap, true);
  assert.equal(merged.build.minify, 'esbuild');
  assert.deepEqual(merged.define, {
    __DEV__: true,
    __VERSION__: '"1.0.1"',
    __PROD__: false
  });

  // 2. mergeConfig concatenates array options such as resolve conditions and assetsInclude
  const arrayConfig1 = {
    assetsInclude: ['**/*.gltf'],
    resolve: {
      conditions: ['browser']
    }
  };
  const arrayConfig2 = {
    assetsInclude: ['**/*.glb'],
    resolve: {
      conditions: ['production']
    }
  };
  const mergedArrays = mergeConfig(arrayConfig1, arrayConfig2);
  assert.deepEqual(mergedArrays.assetsInclude, ['**/*.gltf', '**/*.glb']);
  assert.deepEqual(mergedArrays.resolve.conditions, ['browser', 'production']);

  // 3. mergeConfig merges object-format resolve alias entries while preserving non-conflicting keys
  const aliasObj1 = {
    resolve: {
      alias: {
        '@': '/src',
        components: '/src/components'
      }
    }
  };
  const aliasObj2 = {
    resolve: {
      alias: {
        utils: '/src/utils',
        components: '/custom/components'
      }
    }
  };
  const mergedAliasObj = mergeConfig(aliasObj1, aliasObj2);
  assert.deepEqual(mergedAliasObj.resolve.alias, {
    '@': '/src',
    utils: '/src/utils',
    components: '/custom/components'
  });

  // 4. mergeConfig prepends override entries to array-format resolve alias collections preserving evaluation order
  const aliasArr1 = {
    resolve: {
      alias: [
        { find: '@', replacement: '/src' },
        { find: 'utils', replacement: '/src/utils' }
      ]
    }
  };
  const aliasArr2 = {
    resolve: {
      alias: [
        { find: 'utils', replacement: '/override/utils' },
        { find: 'helpers', replacement: '/src/helpers' }
      ]
    }
  };
  const mergedAliasArr = mergeConfig(aliasArr1, aliasArr2);
  assert.deepEqual(mergedAliasArr.resolve.alias, [
    { find: 'utils', replacement: '/override/utils' },
    { find: 'helpers', replacement: '/src/helpers' },
    { find: '@', replacement: '/src' },
    { find: 'utils', replacement: '/src/utils' }
  ]);

  // 5. mergeConfig combines plugin arrays from both configurations into a single collection
  const pluginA = { name: 'plugin-a' };
  const pluginB = { name: 'plugin-b' };
  const pluginC = { name: 'plugin-c' };
  const pluginConfig1 = { plugins: [pluginA, [pluginB]] };
  const pluginConfig2 = { plugins: [pluginC] };
  const mergedPlugins = mergeConfig(pluginConfig1, pluginConfig2);
  assert.deepEqual(mergedPlugins.plugins, [pluginA, [pluginB], pluginC]);

  // 6. mergeConfig produces a new configuration object without mutating the input configurations
  const originalA = { server: { port: 3000 } };
  const originalB = { server: { host: 'localhost' } };
  const mergedServer = mergeConfig(originalA, originalB);
  assert.notEqual(mergedServer, originalA);
  assert.notEqual(mergedServer, originalB);
  assert.notEqual(mergedServer.server, originalA.server);
  assert.equal(originalA.server.host, undefined);
  assert.equal(originalB.server.port, undefined);
  assert.equal(mergedServer.server.port, 3000);
  assert.equal(mergedServer.server.host, 'localhost');

  // 7. mergeConfig is exported as a named function from vite
  assert.equal(typeof mergeConfig, 'function');
  assert.equal(mergeConfig.name, 'mergeConfig');
}

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