API запуска браузера

on('before:browser:launch', (browser = {}, launchOptions) => {
  /* ... */
})

// cypress/plugins/index.js
module.exports = (on, config) => {
  on('before:browser:launch', (browser = {}, launchOptions) => {
    // `args` is an array of all the arguments that will
    // be passed to browsers when it launches
    console.log(launchOptions.args) // print all current args

    if (browser.family === 'chromium' && browser.name !== 'electron') {
      // auto open devtools
      launchOptions.args.push('--auto-open-devtools-for-tabs')
    }

    if (browser.family === 'firefox') {
      // auto open devtools
      launchOptions.args.push('-devtools')
    }

    if (browser.name === 'electron') {
      // auto open devtools
      launchOptions.preferences.devTools = true
    }

    // whatever you return here becomes the launchOptions
    return launchOptions
  })
}

// cypress/plugins/index.js
module.exports = (on, config) => {
  on('before:browser:launch', (browser, launchOptions) => {
    // supply the absolute path to an unpacked extension's folder
    // NOTE: extensions cannot be loaded in headless Chrome
    launchOptions.extensions.push('Users/jane/path/to/extension')

    return launchOptions
  })
}

// cypress/plugins/index.js
module.exports = (on, config) => {
  on('before:browser:launch', (browser, launchOptions) => {
    if (browser.family === 'chromium' && browser.name !== 'electron') {
      // in Chromium, preferences can exist in Local State, Preferences, or Secure Preferences
      // via launchOptions.preferences, these can be acccssed as `localState`, `default`, and `secureDefault`

      // for example, to set `somePreference: true` in Preferences:
      launchOptions.preferences.default['preference'] = true

      return launchOptions
    }

    if (browser.family === 'firefox') {
      // launchOptions.preferences is a map of preference names to values
      launchOptions.preferences['some.preference'] = true

      return launchOptions
    }

    if (browser.name === 'electron') {
      // launchOptions.preferences is a `BrowserWindow` `options` object
      launchOptions.preferences.darkTheme = true

      return launchOptions
    }
  })
}

export ELECTRON_EXTRA_LAUNCH_ARGS=--disable-http-cache --lang=es

set ELECTRON_EXTRA_LAUNCH_ARGS=--disable-http-cache --lang=es

// cypress/plugins/index.js
module.exports = (on, config) => {
  on('before:browser:launch', (browser, launchOptions) => {
    if (browser.name === 'chrome' && browser.isHeadless) {
      // fullPage screenshot size is 1400x1200 on non-retina screens
      // and 2800x2400 on retina screens
      launchOptions.args.push('--window-size=1400,1200')

      // force screen to be non-retina (1400x1200 size)
      launchOptions.args.push('--force-device-scale-factor=1')

      // force screen to be retina (2800x2400 size)
      // launchOptions.args.push('--force-device-scale-factor=2')
    }

    if (browser.name === 'electron' && browser.isHeadless) {
      // fullPage screenshot size is 1400x1200
      launchOptions.preferences.width = 1400
      launchOptions.preferences.height = 1200
    }

    if (browser.name === 'firefox' && browser.isHeadless) {
      // menubars take up height on the screen
      // so fullPage screenshot size is 1400x1126
      launchOptions.args.push('--width=1400')
      launchOptions.args.push('--height=1200')
    }

    return launchOptions
  })
}

// cypress/plugins/index.js
module.exports = (on, config) => {
  on('before:browser:launch', (browser, launchOptions) => {
    if (browser.name === 'chrome' && browser.isHeadless) {
      // force screen to behave like retina
      // when running Chrome headless browsers
      // (2560x1440 in size by default)
      launchOptions.args.push('--force-device-scale-factor=2')
    }

    return launchOptions
  })
}

// cypress/plugins/index.js
module.exports = (on, config) => {
  on('before:browser:launch', (browser = {}, launchOptions) => {
    if (browser.family === 'chromium' && browser.name !== 'electron') {
      launchOptions.args.push('--start-fullscreen')

      return launchOptions
    }

    if (browser.name === 'electron') {
      launchOptions.preferences.fullscreen = true

      return launchOptions
    }
  })
}

// cypress/plugins/index.js
module.exports = (on, config) => {
  on('before:browser:launch', (browser = {}, launchOptions) => {
    if (browser.family === 'chromium' && browser.name !== 'electron') {
      // Mac/Linux
      launchOptions.args.push(
        '--use-file-for-fake-video-capture=cypress/fixtures/my-video.y4m'
      )

      // Windows
      // launchOptions.args.push('--use-file-for-fake-video-capture=c:\\path\\to\\video\\my-video.y4m')
    }

    return launchOptions
  })
}

module.exports = (on) => {
  on('before:browser:launch', (browser, options) => {
    // only Firefox requires all mime types to be listed
    if (browser.family === 'firefox') {
      const existingMimeTypes =
        options.preferences['browser.helperApps.neverAsk.saveToDisk']
      const myMimeType = 'my/mimetype'

      // prevents the browser download prompt
      options.preferences[
        'browser.helperApps.neverAsk.saveToDisk'
      ] = `${existingMimeTypes},${myMimeType}`

      return options
    }
  })
}

module.exports = (on) => {
  on('before:browser:launch', (browser = {}, launchOptions) => {
    if (browser.family === 'firefox') {
      launchOptions.preferences['browser.send_pings'] = true
    }

    return launchOptions
  })
}