npm init playwright@latest

<root>
`playwright.config.ts
`package.json
`package-lock.json
`tests/
  `example.spec.ts
`tests-examples/
  `demo-todo-app.spec.ts

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

export default defineConfig({
  testDir: './tests',
  fullyParallel: true,
  forbidOnly: !!process.env.CI,
  retries: process.env.CI ? 2 : 0,
  workers: process.env.CI ? 1 : undefined,
  reporter: 'html',
  use: {
    trace: 'on-first-retry',
  },
  projects: [
    {
      name: 'chromium',
      use: { ...devices['Desktop Chrome'] },
    },
  ],
});

npx playwright test --workers 4

// playwright.config.ts

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

export default defineConfig({
  workers: 4,
  reporter: 'blob'
});

npx playwright test --shard=1/4
npx playwright test --shard=2/4
npx playwright test --shard=3/4
npx playwright test --shard=4/4

npx playwright merge-reports --reporter html ./all-blob-reports