rxjs
Version:
Reactive Extensions for modern JavaScript
40 lines • 1.73 kB
JavaScript
import { isFunction } from '../util/isFunction';
import { operate } from '../util/lift';
import { OperatorSubscriber } from './OperatorSubscriber';
import { identity } from '../util/identity';
export function tap(observerOrNext, error, complete) {
const tapObserver = isFunction(observerOrNext) || error || complete
?
{ next: observerOrNext, error, complete }
: observerOrNext;
return tapObserver
? operate((source, subscriber) => {
var _a;
(_a = tapObserver.subscribe) === null || _a === void 0 ? void 0 : _a.call(tapObserver);
let isUnsub = true;
source.subscribe(new OperatorSubscriber(subscriber, (value) => {
var _a;
(_a = tapObserver.next) === null || _a === void 0 ? void 0 : _a.call(tapObserver, value);
subscriber.next(value);
}, () => {
var _a;
isUnsub = false;
(_a = tapObserver.complete) === null || _a === void 0 ? void 0 : _a.call(tapObserver);
subscriber.complete();
}, (err) => {
var _a;
isUnsub = false;
(_a = tapObserver.error) === null || _a === void 0 ? void 0 : _a.call(tapObserver, err);
subscriber.error(err);
}, () => {
var _a, _b;
if (isUnsub) {
(_a = tapObserver.unsubscribe) === null || _a === void 0 ? void 0 : _a.call(tapObserver);
}
(_b = tapObserver.finalize) === null || _b === void 0 ? void 0 : _b.call(tapObserver);
}));
})
:
identity;
}
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