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/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */
import * as tslib_1 from "tslib";
import { Subscriber } from '../Subscriber';
export function defaultIfEmpty(defaultValue) {
    if (defaultValue === void 0) {
        defaultValue = null;
    }
    return function (source) { return source.lift(new DefaultIfEmptyOperator(defaultValue)); };
}
var DefaultIfEmptyOperator = /*@__PURE__*/ (function () {
    function DefaultIfEmptyOperator(defaultValue) {
        this.defaultValue = defaultValue;
    }
    DefaultIfEmptyOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new DefaultIfEmptySubscriber(subscriber, this.defaultValue));
    };
    return DefaultIfEmptyOperator;
}());
var DefaultIfEmptySubscriber = /*@__PURE__*/ (function (_super) {
    tslib_1.__extends(DefaultIfEmptySubscriber, _super);
    function DefaultIfEmptySubscriber(destination, defaultValue) {
        var _this = _super.call(this, destination) || this;
        _this.defaultValue = defaultValue;
        _this.isEmpty = true;
        return _this;
    }
    DefaultIfEmptySubscriber.prototype._next = function (value) {
        this.isEmpty = false;
        this.destination.next(value);
    };
    DefaultIfEmptySubscriber.prototype._complete = function () {
        if (this.isEmpty) {
            this.destination.next(this.defaultValue);
        }
        this.destination.complete();
    };
    return DefaultIfEmptySubscriber;
}(Subscriber));
//# sourceMappingURL=defaultIfEmpty.js.map