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events: expose Event statics #33649

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events: expose Event statics #33649

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df71b58
events: expose Event statics
benjamingr May 29, 2020
ee3db40
fixup test/parallel/test-eventtarget.js
benjamingr Jun 21, 2020
1de414c
Merge branch 'master' into event-statics
jasnell Jun 21, 2020
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6 changes: 5 additions & 1 deletion lib/internal/event_target.js
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,7 @@ class Event {
get bubbles() { return this.#bubbles; }
get composed() { return this.#composed; }
get eventPhase() {
return this[kTarget] ? 2 : 0; // Equivalent to AT_TARGET or NONE
return this[kTarget] ? Event.AT_TARGET : Event.NONE;
}
get cancelBubble() { return this.#propagationStopped; }
set cancelBubble(value) {
Expand All @@ -127,6 +127,10 @@ class Event {
}

get [Symbol.toStringTag]() { return 'Event'; }
static NONE = 0;
static CAPTURING_PHASE = 1;
static AT_TARGET = 2;
static BUBBLING_PHASE = 3;
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Adding a comment in here that we currently do not use the CAPTURING_PHASE and BUBBLING_PHASE but that they need to be preserved anyway because of the spec would be good.

}

// The listeners for an EventTarget are maintained as a linked list.
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13 changes: 12 additions & 1 deletion test/parallel/test-eventtarget.js
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Expand Up @@ -432,10 +432,21 @@ ok(EventTarget);
target.removeEventListener('foo', a, { capture: false });
target.dispatchEvent(new Event('foo'));
}

{
const target = new EventTarget();
strictEqual(target.toString(), '[object EventTarget]');
const event = new Event('');
strictEqual(event.toString(), '[object Event]');
}
{
strictEqual(Event.NONE, 0);
strictEqual(Event.CAPTURING_PHASE, 1);
strictEqual(Event.AT_TARGET, 2);
strictEqual(Event.BUBBLING_PHASE, 3);
strictEqual(new Event().eventPhase, Event.NONE);
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const target = new EventTarget();
target.addEventListener('foo', common.mustCall((e) => {
strictEqual(e.eventPhase, Event.AT_TARGET);
}), { once: true });
target.dispatchEvent(new Event('foo'));
}