Support Passive Event Listeners

[mciparelli]

It would be nice to have support for passive events.
Related: facebook/react#6436

[Havunen]

Currently Inferno adds events using inline way. equivalent to:

<div onclick="function() {}"></div>

To support this feature new way of handling methods is needed. We used to use addEventListener, but that resulted memory leaks and slow rendering because of removeEventListener (to avoid that leak).

[trueadm]

@Havunen this is now a possibility again with our new event system.

[trueadm]

Let's revisit this post 1.0.

[trueadm]

Add to roadmap @lukeed

[Havunen]

Re-opening as this was never implemented

[sprlwrksAprilmintacpineda]

This looks good, this would have effects in performance. But as far as I have read, this would only be applicable for events that's related to scrolling --> https://developers.google.com/web/tools/lighthouse/audits/passive-event-listeners. Inferno could handle it by supporting event options like so:

<span onScroll={{
  handler (ev) {
    // do something
  },
  options: {
    passive: true
  }
}}>

OR adding it automatically when the event listener is related to scrolling.

There's even a demo video about this --> https://youtu.be/65VMej8n23A

[aprilmintacpineda]

I think it's good for inferno to support passive listener for onScroll by default.