Understanding playwright.config.ts

import { defineConfig, devices } from '@playwright/test';

export default defineConfig({
  // Where are your test files?
  testDir: './tests',

  // Run tests in each file one after another
  // Set to true if tests in the same file depend on each other
  fullyParallel: true,

  // Fail the build on CI if you accidentally left test.only
  forbidOnly: !!process.env.CI,

  // Retry failed tests. 0 in dev, 2 in CI.
  retries: process.env.CI ? 2 : 0,

  // How many tests run in parallel. Defaults to half your CPU cores.
  workers: process.env.CI ? 1 : undefined,

  // Reporter -- what format should test results be in?
  reporter: 'html',

  // Shared settings for all tests
  use: {
    // Base URL for page.goto('/login') instead of full URL
    baseURL: 'https://www.testerrank.com',

    // Record trace on first retry (best for CI debugging)
    trace: 'on-first-retry',

    // Take screenshot only on failure
    screenshot: 'only-on-failure',

    // Record video only on failure
    video: 'retain-on-failure',
  },

  // Test against multiple browsers
  projects: [
    {
      name: 'chromium',
      use: { ...devices['Desktop Chrome'] },
    },
    {
      name: 'firefox',
      use: { ...devices['Desktop Firefox'] },
    },
    {
      name: 'webkit',
      use: { ...devices['Desktop Safari'] },
    },
  ],
});