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							- "use strict";
 
- Object.defineProperty(exports, "__esModule", { value: true });
 
- exports.single = void 0;
 
- var EmptyError_1 = require("../util/EmptyError");
 
- var SequenceError_1 = require("../util/SequenceError");
 
- var NotFoundError_1 = require("../util/NotFoundError");
 
- var lift_1 = require("../util/lift");
 
- var OperatorSubscriber_1 = require("./OperatorSubscriber");
 
- function single(predicate) {
 
-     return lift_1.operate(function (source, subscriber) {
 
-         var hasValue = false;
 
-         var singleValue;
 
-         var seenValue = false;
 
-         var index = 0;
 
-         source.subscribe(OperatorSubscriber_1.createOperatorSubscriber(subscriber, function (value) {
 
-             seenValue = true;
 
-             if (!predicate || predicate(value, index++, source)) {
 
-                 hasValue && subscriber.error(new SequenceError_1.SequenceError('Too many matching values'));
 
-                 hasValue = true;
 
-                 singleValue = value;
 
-             }
 
-         }, function () {
 
-             if (hasValue) {
 
-                 subscriber.next(singleValue);
 
-                 subscriber.complete();
 
-             }
 
-             else {
 
-                 subscriber.error(seenValue ? new NotFoundError_1.NotFoundError('No matching values') : new EmptyError_1.EmptyError());
 
-             }
 
-         }));
 
-     });
 
- }
 
- exports.single = single;
 
- //# sourceMappingURL=single.js.map
 
 
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