25 lines
926 B
JavaScript
25 lines
926 B
JavaScript
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import { Observable } from '../Observable';
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import { isArray } from '../util/isArray';
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import { isFunction } from '../util/isFunction';
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import { map } from '../operators/map';
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export function fromEventPattern(addHandler, removeHandler, resultSelector) {
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if (resultSelector) {
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return fromEventPattern(addHandler, removeHandler).pipe(map(args => isArray(args) ? resultSelector(...args) : resultSelector(args)));
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}
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return new Observable(subscriber => {
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const handler = (...e) => subscriber.next(e.length === 1 ? e[0] : e);
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let retValue;
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try {
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retValue = addHandler(handler);
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}
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catch (err) {
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subscriber.error(err);
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return undefined;
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}
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if (!isFunction(removeHandler)) {
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return undefined;
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}
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return () => removeHandler(handler, retValue);
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});
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}
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//# sourceMappingURL=fromEventPattern.js.map
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