Puppeteer: browser.close not returning a Promise

[gojko]

Steps to reproduce

Tell us about your environment:

• Puppeteer version: 0.10.2
• Platform / OS version: MacOS 10.12.6
• URLs (if applicable):

What steps will reproduce the problem?

_Please include code that reproduces the issue._

$ node
> let browser;
> const puppeteer = require('puppeteer');
> puppeteer.launch().then(t => browser = t).then(() => console.log('launched'))
Promise { <pending> }
launched
> browser.close().then(() => console.log('closed'))
TypeError: Cannot read property 'then' of undefined

What is the expected result?

browser.close to return a Promise, as per documentation

What happens instead?

browser.close returns undefined

[vsemozhetbyt]

browser.close() returns promise in the latest v0.11.0-alpha (see the version in the top of the doc) — unlike v0.10.2