vite 5.4.14: createServer

audit=false

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.createServer in pkg:npm/vite@5.4.14
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vite@5.4.14
Demonstrate these symbols/APIs:
  - vite.createServer

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:sha256:93c1718793a7b41af400af4387512e639b44229b4c31fb18755091217c6e9421","contract":["createServer returns a ViteDevServer instance with resolved config and connect middlewares","createServer invokes plugin configureServer hook during server initialization","createServer starts an HTTP server listening on an ephemeral port","createServer serves static file content through its connect middleware pipeline","createServer transforms HTML by injecting Vite dev server client scripts","createServer transforms JavaScript module requests applying configured plugin transform hooks","createServer closes the HTTP server and stops listening when close is called"],"goal":"verify vite.createServer in pkg:npm/vite@5.4.14","kind":"HOW","packages":["pkg:npm/vite@5.4.14"],"schemaVersion":1,"symbols":["vite.createServer"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","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@5.4.14"],"schemaVersion":1,"subject":"pkg:npm/vite@5.4.14","symbols":["vite.createServer"],"verifierAdapter":"node-typescript@1"}

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}

{
  "name": "sample-vite-create-server",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "vite": "5.4.14"
  }
}

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

import { createServer } from 'vite';

/**
 * Creates and initializes a Vite dev server instance with the given configuration.
 *
 * @param {import('vite').InlineConfig} [inlineConfig={}] - Inline server configuration
 * @returns {Promise<import('vite').ViteDevServer>} Vite dev server instance
 */
export async function createDevServer(inlineConfig = {}) {
  return createServer({
    configFile: false,
    server: {
      host: '127.0.0.1',
      port: 0,
      ...inlineConfig.server
    },
    ...inlineConfig
  });
}

/**
 * Creates, starts, and listens on a Vite dev server on the specified port.
 *
 * @param {number} [port=0] - Port to listen on (0 for random available port)
 * @param {import('vite').InlineConfig} [inlineConfig={}] - Additional configuration
 * @returns {Promise<import('vite').ViteDevServer>} Running Vite dev server instance
 */
export async function startDevServer(port = 0, inlineConfig = {}) {
  const server = await createServer({
    configFile: false,
    server: {
      host: '127.0.0.1',
      port,
      ...inlineConfig.server
    },
    ...inlineConfig
  });
  return server.listen();
}

export { createServer };
export default createServer;

import assert from 'node:assert/strict';
import fs from 'node:fs/promises';
import http from 'node:http';
import path from 'node:path';
import os from 'node:os';
import { createServer, createDevServer, startDevServer } from '../src/index.mjs';

async function runContract() {
  const tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'vite-server-contract-'));

  try {
    const htmlFile = path.join(tmpDir, 'index.html');
    await fs.writeFile(htmlFile, '<!DOCTYPE html><html><head></head><body><h1>Vite Server</h1></body></html>');

    const staticFile = path.join(tmpDir, 'hello.txt');
    await fs.writeFile(staticFile, 'hello from vite dev server');

    const moduleFile = path.join(tmpDir, 'main.js');
    await fs.writeFile(moduleFile, 'export const answer = 42;\n');

    // 1. createServer returns a ViteDevServer instance with resolved config and connect middlewares
    let hookCalled = false;
    let hookArg = null;

    const server = await createDevServer({
      root: tmpDir,
      logLevel: 'silent',
      server: {
        host: '127.0.0.1',
        port: 0
      },
      plugins: [
        {
          name: 'test-plugin',
          configureServer(s) {
            hookCalled = true;
            hookArg = s;
          },
          transform(code, id) {
            if (id.endsWith('main.js')) {
              return code.replace('42', '100');
            }
          }
        }
      ]
    });

    assert.ok(server && typeof server === 'object', 'Server must be an object');
    assert.equal(server.config.root, tmpDir, 'Server root must match configured directory');
    assert.ok(server.middlewares && typeof server.middlewares.use === 'function', 'Server must have connect middlewares');
    assert.ok(server.httpServer && typeof server.httpServer.listen === 'function', 'Server must have httpServer');

    // 2. createServer invokes plugin configureServer hook during server initialization
    assert.equal(hookCalled, true, 'Plugin configureServer hook must be invoked');
    assert.ok(hookArg && typeof hookArg === 'object', 'configureServer hook must receive server object');
    assert.equal(hookArg.middlewares, server.middlewares, 'configureServer must share middlewares instance');
    assert.equal(hookArg.config, server.config, 'configureServer must share config instance');

    // 3. createServer starts an HTTP server listening on an ephemeral port
    await server.listen();
    assert.equal(server.httpServer.listening, true, 'httpServer must be listening after listen()');
    const addr = server.httpServer.address();
    assert.ok(addr && typeof addr === 'object', 'Server address must be available');
    assert.ok(addr.port > 0, 'Listening port must be positive integer');

    // 4. createServer serves static file content through its connect middleware pipeline
    const httpRes = await new Promise((resolve, reject) => {
      http.get({ host: addr.address, port: addr.port, path: '/hello.txt' }, (res) => {
        let body = '';
        res.on('data', chunk => { body += chunk; });
        res.on('end', () => resolve({ statusCode: res.statusCode, body }));
      }).on('error', reject);
    });
    assert.equal(httpRes.statusCode, 200, 'Expected 200 status code for static file');
    assert.equal(httpRes.body, 'hello from vite dev server', 'Expected static file body');

    // 5. createServer transforms HTML by injecting Vite dev server client scripts
    const rawHtml = '<!DOCTYPE html><html><head></head><body><h1>Vite Server</h1></body></html>';
    const transformedHtml = await server.transformIndexHtml('/index.html', rawHtml);
    assert.ok(transformedHtml.includes('/@vite/client'), 'Transformed HTML must contain Vite client script');
    assert.ok(transformedHtml.includes('<h1>Vite Server</h1>'), 'Transformed HTML must preserve document body');

    // 6. createServer transforms JavaScript module requests applying configured plugin transform hooks
    const transformedModule = await server.transformRequest('/main.js');
    assert.ok(transformedModule && typeof transformedModule.code === 'string', 'transformRequest must return code');
    assert.ok(transformedModule.code.includes('100'), 'transformRequest must reflect plugin transformation');

    // 7. createServer closes the HTTP server and stops listening when close is called
    await server.close();
    assert.equal(server.httpServer.listening, false, 'httpServer must not be listening after close()');

    console.log('Contract tests passed successfully.');
  } finally {
    await fs.rm(tmpDir, { recursive: true, force: true });
  }
}

await runContract();