Puppeteer Launch Options

Unlighthouse uses Puppeteer to control Chrome for Lighthouse audits. Configure browser behavior via puppeteerOptions.

All Available Options

export default defineUnlighthouseConfig({
  puppeteerOptions: {
    // See: https://pptr.dev/api/puppeteer.launchoptions
  },
})

Full reference: Puppeteer LaunchOptions API

Common Configurations

Headless Mode

// Run with visible browser (debugging)
export default defineUnlighthouseConfig({
  puppeteerOptions: {
    headless: false,
  },
})

Custom Chrome Executable

export default defineUnlighthouseConfig({
  puppeteerOptions: {
    executablePath: '/usr/bin/google-chrome',
  },
})

Chrome Arguments

Common args for CI/Docker environments:

export default defineUnlighthouseConfig({
  puppeteerOptions: {
    args: [
      '--no-sandbox',
      '--disable-setuid-sandbox',
      '--disable-dev-shm-usage',
      '--disable-gpu',
    ],
  },
})

Viewport Settings

export default defineUnlighthouseConfig({
  puppeteerOptions: {
    defaultViewport: {
      width: 1920,
      height: 1080,
    },
  },
})

Timeout Configuration

export default defineUnlighthouseConfig({
  puppeteerOptions: {
    timeout: 60000, // 60 seconds
  },
})

User Data Directory

Persist browser data between runs:

export default defineUnlighthouseConfig({
  puppeteerOptions: {
    userDataDir: './.puppeteer-data',
  },
})

Navigation Hooks

Hook into Puppeteer's page navigation for custom logic.

Before Page Load

export default defineUnlighthouseConfig({
  hooks: {
    'puppeteer:before-goto': async (page) => {
      // Set localStorage before navigation
      await page.evaluateOnNewDocument((token) => {
        localStorage.setItem('auth', token)
      }, process.env.AUTH_TOKEN)
    },
  },
})

Modify Page Content

export default defineUnlighthouseConfig({
  hooks: {
    'puppeteer:before-goto': async (page) => {
      page.waitForNavigation().then(async () => {
        // Remove elements that cause CLS
        await page.evaluate(() => {
          document.querySelector('.cookie-banner')?.remove()
        })
      })
    },
  },
})