puppeteer-extra-plugin-stealth/evasions/window.outerdimensions/index.js

Stealth mode: Applies various techniques to make detection of headless puppeteer harder.

'use strict'

const { PuppeteerExtraPlugin } = require('puppeteer-extra-plugin')

/**
 * Fix missing window.outerWidth/window.outerHeight in headless mode
 * Will also set the viewport to match window size, unless specified by user
 */
class Plugin extends PuppeteerExtraPlugin {
  constructor(opts = {}) {
    super(opts)
  }

  get name() {
    return 'stealth/evasions/window.outerdimensions'
  }

  async onPageCreated(page) {
    // Chrome returns undefined, Firefox false
    await page.evaluateOnNewDocument(() => {
      try {
        if (window.outerWidth && window.outerHeight) {
          return // nothing to do here
        }
        const windowFrame = 85 // probably OS and WM dependent
        window.outerWidth = window.innerWidth
        window.outerHeight = window.innerHeight + windowFrame
      } catch (err) {}
    })
  }

  async beforeLaunch(options) {
    // Have viewport match window size, unless specified by user
    // https://github.com/GoogleChrome/puppeteer/issues/3688
    if (!('defaultViewport' in options)) {
      options.defaultViewport = null
    }
    return options
  }
}

module.exports = function(pluginConfig) {
  return new Plugin(pluginConfig)
}