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/** PURE_IMPORTS_START _Observable,_util_isArray,_util_isFunction,_operators_map PURE_IMPORTS_END */
import { Observable } from '../Observable';
import { isArray } from '../util/isArray';
import { isFunction } from '../util/isFunction';
import { map } from '../operators/map';
export function fromEventPattern(addHandler, removeHandler, resultSelector) {
    if (resultSelector) {
        return fromEventPattern(addHandler, removeHandler).pipe(map(function (args) { return isArray(args) ? resultSelector.apply(void 0, args) : resultSelector(args); }));
    }
    return new Observable(function (subscriber) {
        var handler = function () {
            var e = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                e[_i] = arguments[_i];
            }
            return subscriber.next(e.length === 1 ? e[0] : e);
        };
        var retValue;
        try {
            retValue = addHandler(handler);
        }
        catch (err) {
            subscriber.error(err);
            return undefined;
        }
        if (!isFunction(removeHandler)) {
            return undefined;
        }
        return function () { return removeHandler(handler, retValue); };
    });
}
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