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fix(std/node): emitter.removeAllListeners (#5583)

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When given a non-registered eventName to 
emitter.removeAllListeners(eventName), current code 
would remove all listeners instead of silently skip, 
which is not ideal.
This commit is contained in:
blairzhao111 2020-06-09 21:07:25 +08:00 • committed by GitHub
parent 878f306a39
commit 6c21ba0575
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2 changed files with 28 additions and 7 deletions
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19
std/node/events_test.ts
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@ -245,6 +245,25 @@ test({
},
});
test({
name: "Provide a non-existent event to removeAllListeners will do nothing",
fn() {
const testEmitter = new EventEmitter();
testEmitter.on("event", shouldNeverBeEmitted);
testEmitter.on("event", shouldNeverBeEmitted);
testEmitter.on("other event", shouldNeverBeEmitted);
testEmitter.on("other event", shouldNeverBeEmitted);
testEmitter.once("other event", shouldNeverBeEmitted);
assertEquals(testEmitter.listenerCount("event"), 2);
assertEquals(testEmitter.listenerCount("other event"), 3);
testEmitter.removeAllListeners("non-existent");
assertEquals(testEmitter.listenerCount("event"), 2);
assertEquals(testEmitter.listenerCount("other event"), 3);
},
});
test({
name: "Remove individual listeners, which can also be chained",
fn() {