Monaco-editor: Chrome warning: non-passive mousewheel listeners

[JacobEvelyn]

monaco-editor version: 0.14.6
Browser: Chrome
OS: macOS

I noticed that Chrome's dev tools in verbose mode includes a handful of identical warnings when loading Monaco:

[Violation] Added non-passive event listener to a scroll-blocking 'mousewheel' event. Consider marking event handler as 'passive' to make the page more responsive. See https://www.chromestatus.com/feature/5745543795965952

I'm not sure if there's an intentional reason why these event listeners aren't passive or if it was just an oversight, but I thought I'd surface it in case others also hadn't noticed these warnings.

[alexdima]

This is intentional. The editor uses those events to paint only the current visible viewport of the editor.

[evmar]

Is it a bug in Chrome that it warns on these?

[alexdima]

It is a hint that Chrome shows to developers that introduces a new possibility (at the time) for scroll listeners, with the passive flag. I have seen the hint, am aware of it, but our use-case is valid and we cannot use the passive flag. I don't know if there is a way to explain that to Chrome to have it not print these messages anymore.

[dtapuska]

You can avoid the warning if the code that adds the event listener actually specifies passive: true or passive: false. If the passive attribute is set either way it will not warn.

[sahel-sh]

Had a chat with Nzolghadr@chromium, we can change the link to the explainer which has more information:
https://github.com/WICG/EventListenerOptions/blob/gh-pages/explainer.md