CodeSampleX

Sample

vite 5.4.21: defineConfig

Verified sample for npm vite 5.4.21: defineConfig. The contract ran on node 22 · linux alpine/x64 · docker and passed: defineConfig returns the exact object…

sha256:7338124b0e271ff76969245833bd5c78bf09f62bc758d92ae832f97a59e3b7a0

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 alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-26

Case

HOW
Goal
verify vite.defineConfig in pkg:npm/vite@5.4.21
Packages
Symbols
  • vite.defineConfig
Environment
node 22.23.2
Created
2026-08-26T06:16:50Z

Contract

  1. defineConfig returns the exact object reference passed to it for static configuration objects
  2. defineConfig returns synchronous configuration factory functions with ConfigEnv parameters
  3. defineConfig preserves asynchronous configuration factory functions returning Promises
  4. defineConfig preserves direct Promise instances for asynchronously resolved configurations
  5. defineConfig static configurations are valid UserConfig objects that resolveConfig normalizes
  6. defineConfig is exported as a named function from vite

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.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.
csx.json
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package-lock.json
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package.json
{
  "name": "sample-vite-define-config",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "vite": "5.4.21"
  }
}
spec.json
{
  "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"
  }
}
test/contract.mjs
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);
});

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