puppeteer: v2.0 Breaking Changes

These are the breaking changes we’d like to have for v2.0:

• ~~set initial viewport size to 1280 x 1024 - https://github.com/GoogleChrome/puppeteer/issues/1910~~ (not doing this for 2.0 - doesn’t seem worth the hassle)
• make browser.disconnect async: sockets don’t close instantly.
• make page.evaluate to throw for the non-serializable values (e.g. objects with circular references) #2864
• refactor response.securityDetails() into response.certificate() and actually include certificate data (DEPRECATE OLD ONE)
• consider switching to pipes instead of websocket connection by default (not doing this - not worth the hassle)
• consider dropping node6 support (https://github.com/GoogleChrome/puppeteer/pull/5045)
• consider renaming waitForSelector’s “visible” option into “interactable” since we also have a real visibility with IntersectionObserver. https://github.com/GoogleChrome/puppeteer/pull/2673
• consider passing calling frame as the first argument to the function exposed via page.exposeFunction. #2126 (BETTER DO A frame.exposeFunction to expose per-frame)
• use single “defaultTimeout” option to setup default timeout for all methods. The option should support 0 to help with debugging. #3158
• move to flatten protocol. https://github.com/GoogleChrome/puppeteer/pull/3524
• move page.tracing to browser.tracing; pass a page to capture screenshots of as a method argument. https://github.com/GoogleChrome/puppeteer/issues/3639 (DEPRECATE THE OLD API)
• make page.screenshot clip elements to the viewport per upstream Chromium changes. This matches the clipping behavior of elements in inner scrollers, i.e. document and overflow scroll clipping now work the same.
• rename page.emulateMedia to page.emulateMediaType (DEPRECATE THE OLD API). This is technically not a breaking chance since we’ll keep an alias for now. #5012