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lib: check number of arguments in EventTarget's function
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For now, addEventListener() only checks number of arguments.
removeEventListener() and dispatchEvent() also need checking
number of arguments.

PR-URL: #45668
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com>
deokjinkim authored and targos committed Dec 13, 2022
1 parent 9f7bb5c commit e874508
Showing 2 changed files with 33 additions and 0 deletions.
4 changes: 4 additions & 0 deletions lib/internal/event_target.js
Original file line number Diff line number Diff line change
@@ -636,6 +636,8 @@ class EventTarget {
removeEventListener(type, listener, options = kEmptyObject) {
if (!isEventTarget(this))
throw new ERR_INVALID_THIS('EventTarget');
if (arguments.length < 2)
throw new ERR_MISSING_ARGS('type', 'listener');
if (!validateEventListener(listener))
return;

@@ -666,6 +668,8 @@ class EventTarget {
dispatchEvent(event) {
if (!isEventTarget(this))
throw new ERR_INVALID_THIS('EventTarget');
if (arguments.length < 1)
throw new ERR_MISSING_ARGS('event');

if (!(event instanceof Event))
throw new ERR_INVALID_ARG_TYPE('event', 'Event', event);
29 changes: 29 additions & 0 deletions test/parallel/test-eventtarget.js
Original file line number Diff line number Diff line change
@@ -685,3 +685,32 @@ let asyncTest = Promise.resolve();
et.dispatchEvent(new Event('foo'));
});
}

{
const et = new EventTarget();

throws(() => et.addEventListener(), {
code: 'ERR_MISSING_ARGS',
name: 'TypeError',
});

throws(() => et.addEventListener('foo'), {
code: 'ERR_MISSING_ARGS',
name: 'TypeError',
});

throws(() => et.removeEventListener(), {
code: 'ERR_MISSING_ARGS',
name: 'TypeError',
});

throws(() => et.removeEventListener('foo'), {
code: 'ERR_MISSING_ARGS',
name: 'TypeError',
});

throws(() => et.dispatchEvent(), {
code: 'ERR_MISSING_ARGS',
name: 'TypeError',
});
}

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