インストール直後のplaywright.configは以下のようになっています。

    import { defineConfig, devices } from '@playwright/test';
    
    /**
     * Read environment variables from file.
     * https://github.com/motdotla/dotenv
     */
    // import dotenv from 'dotenv';
    // import path from 'path';
    // dotenv.config({ path: path.resolve(__dirname, '.env') });
    
    /**
     * See https://playwright.dev/docs/test-configuration.
     */
    export default defineConfig({
      testDir: './tests',
      /* Run tests in files in parallel */
      fullyParallel: true,
      /* Fail the build on CI if you accidentally left test.only in the source code. */
      forbidOnly: !!process.env.CI,
      /* Retry on CI only */
      retries: process.env.CI ? 2 : 0,
      /* Opt out of parallel tests on CI. */
      workers: process.env.CI ? 1 : undefined,
      /* Reporter to use. See https://playwright.dev/docs/test-reporters */
      reporter: 'html',
      /* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
      use: {
        /* Base URL to use in actions like `await page.goto('/')`. */
        // baseURL: 'http://127.0.0.1:3000',
    
        /* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */
        trace: 'on-first-retry',
      },
    
      /* Configure projects for major browsers */
      projects: [
        {
          name: 'chromium',
          use: { ...devices['Desktop Chrome'] },
        },
    
        {
          name: 'firefox',
          use: { ...devices['Desktop Firefox'] },
        },
    
        {
          name: 'webkit',
          use: { ...devices['Desktop Safari'] },
        },
    
        /* Test against mobile viewports. */
        // {
        //   name: 'Mobile Chrome',
        //   use: { ...devices['Pixel 5'] },
        // },
        // {
        //   name: 'Mobile Safari',
        //   use: { ...devices['iPhone 12'] },
        // },
    
        /* Test against branded browsers. */
        // {
        //   name: 'Microsoft Edge',
        //   use: { ...devices['Desktop Edge'], channel: 'msedge' },
        // },
        // {
        //   name: 'Google Chrome',
        //   use: { ...devices['Desktop Chrome'], channel: 'chrome' },
        // },
      ],
    
      /* Run your local dev server before starting the tests */
      // webServer: {
      //   command: 'npm run start',
      //   url: 'http://127.0.0.1:3000',
      //   reuseExistingServer: !process.env.CI,
      // },
    });