node_modules/rxjs/dist/esm/internal/observable/fromEventPattern.js

import { Observable } from '../Observable';
import { isFunction } from '../util/isFunction';
import { mapOneOrManyArgs } from '../util/mapOneOrManyArgs';
export function fromEventPattern(addHandler, removeHandler, resultSelector) {
    if (resultSelector) {
        return fromEventPattern(addHandler, removeHandler).pipe(mapOneOrManyArgs(resultSelector));
    }
    return new Observable((subscriber) => {
        const handler = (...e) => subscriber.next(e.length === 1 ? e[0] : e);
        const retValue = addHandler(handler);
        return isFunction(removeHandler) ? () => removeHandler(handler, retValue) : undefined;
    });
}
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