/
fromEvent.ts
52 lines (45 loc) · 1.33 KB
/
fromEvent.ts
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import { Push } from '@definitions';
import { Observable } from '../classes/Observable';
import { TypeGuard } from 'type-core';
export function fromEvent<T>(
source: NodeJS.EventEmitter,
name: string | symbol
): Push.Observable<T>;
export function fromEvent(
source: EventTarget,
name: string,
capture?: boolean
): Push.Observable<Event>;
export function fromEvent(
source: NodeJS.EventEmitter | EventTarget,
name: string | symbol,
capture?: boolean
): Push.Observable {
if (TypeGuard.isEventTarget(source)) {
return new Observable<Event>((obs) => {
function listener(event: Event): void {
obs.next(event);
}
try {
source.addEventListener(name as string, listener, capture);
} catch (error) {
obs.error(error as Error);
}
return () => source.removeEventListener(name as string, listener);
});
}
if (TypeGuard.isEventEmitterLike(source)) {
return new Observable((obs) => {
function listener(...events: any[]): void {
events.length > 1 ? obs.next(events) : obs.next(events[0]);
}
try {
source.addListener(name, listener);
} catch (error) {
obs.error(error as Error);
}
return () => source.removeListener(name, listener);
});
}
throw new Error('Source must be an EventEmitter or EventTarget');
}