navigator.webdriver cannot modify

Steps to reproduce

Tell us about your environment:

• Puppeteer version: 1.9.0
• Platform / OS version: macOS High Sierra
• URLs (if applicable):
• Node.js version: 10.0.0

What steps will reproduce the problem?

Please include code that reproduces the issue.

1.create a new page

const page = await browser.newPage()

2.modify navigator webfriver value

const modifyWebdriver = () => {
    Object.defineProperty(navigator, 'webdriver', {
      get: function() {
        return false
      },
    })
  }

await page.evaluate(modifyWebdriver)

3.console .log(navigator.webdriver)

console.log(await page.evaluate('navigator.webdriver'))  // false

4.goto a website

await page.goto('https://www.google.com', {
    waitUntil: 'networkidle2',
    timeout: 3000000,
  })

5.console.log(navigator.webdrive)

console.log(await page.evaluate('navigator.webdriver'))  // true

What is the expected result? console.log(await page.evaluate(‘navigator.webdriver’)) // false

What happens instead? console.log(await page.evaluate(‘navigator.webdriver’)) // true

[rockswang]

Simpler approch: const browser = await puppeteer.launch({ignoreDefaultArgs: [“–enable-automation”]});

[tzbo]

await this.page.evaluateOnNewDocument(() => {
         Object.defineProperty(navigator, 'webdriver', {
         get: () => undefined,
    });
 }