Support for WICG Observable

[H4ad]

What is the problem this feature will solve?

This new proposal adds .when method to EventTarget, then we can control event handling using Observable API.

Example from the spec:

// Filtering and mapping:
element
	.when('click')
	.filter((e) => e.target.matches('.foo'))
	.map((e) => ({ x: e.clientX, y: e.clientY }))
	.subscribe({ next: handleClickAtPoint });

Spec: https://github.com/WICG/Observable
Standard Tracking: WICG/observable#93

This is something that makes sense to implement on Node?

What is the feature you are proposing to solve the problem?

Basically implements the new .when method at:

node/lib/internal/event_target.js

Line 551 in a0ac8bd

class EventTarget {

What alternatives have you considered?

The @benlesh (contributor of the spec) looks like he already tried to implement this new spec at #51065

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[jimmywarting]

fyi: it's

-	.on('click')
+	.when('click')