@angular/router
Version:
Angular - the routing library
28 lines (27 loc) • 3.27 kB
JavaScript
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { from } from 'rxjs';
import { map, switchMap } from 'rxjs/operators';
/**
* Perform a side effect through a switchMap for every emission on the source Observable,
* but return an Observable that is identical to the source. It's essentially the same as
* the `tap` operator, but if the side effectful `next` function returns an ObservableInput,
* it will wait before continuing with the original value.
*/
export function switchTap(next) {
return function (source) {
return source.pipe(switchMap(function (v) {
var nextResult = next(v);
if (nextResult) {
return from(nextResult).pipe(map(function () { return v; }));
}
return from([v]);
}));
};
}
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