vite 5.4.21: defineConfig

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.defineConfig in pkg:npm/vite@5.4.21
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vite@5.4.21
Demonstrate these symbols/APIs:
  - vite.defineConfig
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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-define-config",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
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}

{
  "name": "sample-vite-define-config",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "vite": "5.4.21"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify vite.defineConfig in pkg:npm/vite@5.4.21",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vite@5.4.21"
  ],
  "symbols": [
    "vite.defineConfig"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert/strict';
import { defineConfig, resolveConfig } from 'vite';

async function testContract() {
  // 1. defineConfig returns the exact object reference passed to it for static configuration objects
  const staticConfig = {
    root: './src',
    base: '/app/',
    build: {
      outDir: 'dist',
      sourcemap: true
    },
    define: {
      __APP_VERSION__: JSON.stringify('1.0.0')
    }
  };
  const definedObject = defineConfig(staticConfig);
  assert.equal(definedObject, staticConfig);
  assert.equal(definedObject.root, './src');
  assert.equal(definedObject.base, '/app/');
  assert.equal(definedObject.build.outDir, 'dist');
  assert.equal(definedObject.build.sourcemap, true);
  assert.equal(definedObject.define.__APP_VERSION__, '"1.0.0"');

  // 2. defineConfig returns synchronous configuration factory functions with ConfigEnv parameters
  const syncFactory = (env) => ({
    mode: env.mode,
    command: env.command,
    base: env.mode === 'production' ? '/static/' : '/',
    ssr: Boolean(env.ssrBuild)
  });
  const definedSyncFn = defineConfig(syncFactory);
  assert.equal(typeof definedSyncFn, 'function');
  assert.equal(definedSyncFn, syncFactory);

  const devConfig = definedSyncFn({ command: 'serve', mode: 'development', ssrBuild: false });
  assert.equal(devConfig.command, 'serve');
  assert.equal(devConfig.mode, 'development');
  assert.equal(devConfig.base, '/');
  assert.equal(devConfig.ssr, false);

  const prodConfig = definedSyncFn({ command: 'build', mode: 'production', ssrBuild: true });
  assert.equal(prodConfig.command, 'build');
  assert.equal(prodConfig.mode, 'production');
  assert.equal(prodConfig.base, '/static/');
  assert.equal(prodConfig.ssr, true);

  // 3. defineConfig preserves asynchronous configuration factory functions returning Promises
  const asyncFactory = async (env) => {
    return {
      mode: env.mode,
      server: {
        port: env.mode === 'test' ? 8080 : 3000
      },
      define: {
        __SSR_ENABLED__: Boolean(env.ssrBuild)
      }
    };
  };
  const definedAsyncFn = defineConfig(asyncFactory);
  assert.equal(typeof definedAsyncFn, 'function');
  assert.equal(definedAsyncFn, asyncFactory);

  const asyncDev = await definedAsyncFn({ command: 'serve', mode: 'test', ssrBuild: false });
  assert.equal(asyncDev.mode, 'test');
  assert.equal(asyncDev.server.port, 8080);
  assert.equal(asyncDev.define.__SSR_ENABLED__, false);

  // 4. defineConfig preserves direct Promise instances for asynchronously resolved configurations
  const directPromise = Promise.resolve({
    publicDir: 'public',
    build: {
      minify: 'esbuild',
      target: 'es2022'
    }
  });
  const definedPromise = defineConfig(directPromise);
  assert.ok(definedPromise instanceof Promise);
  assert.equal(definedPromise, directPromise);

  const resolvedPromiseConfig = await definedPromise;
  assert.equal(resolvedPromiseConfig.publicDir, 'public');
  assert.equal(resolvedPromiseConfig.build.minify, 'esbuild');
  assert.equal(resolvedPromiseConfig.build.target, 'es2022');

  // 5. defineConfig static configurations are valid UserConfig objects that resolveConfig normalizes
  const userConfig = defineConfig({
    configFile: false,
    root: process.cwd(),
    base: '/custom-app/',
    define: {
      __FEATURE_ACTIVE__: true
    }
  });
  const resolved = await resolveConfig(userConfig, 'build', 'production');
  assert.equal(resolved.base, '/custom-app/');
  assert.equal(resolved.command, 'build');
  assert.equal(resolved.mode, 'production');
  assert.equal(resolved.define.__FEATURE_ACTIVE__, true);
  assert.ok(Array.isArray(resolved.plugins));

  // 6. defineConfig is exported as a named function from vite
  assert.equal(typeof defineConfig, 'function');
  assert.equal(defineConfig.name, 'defineConfig');
}

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