9523991a9b
* Pull out `activateRoutes` into new operator * Add `asyncTap` operator * Use `asyncTap` operator for router hooks and remove corresponding abstracted operators * Clean up formatting * Minor performance improvements PR Close #25740
30 lines
995 B
TypeScript
30 lines
995 B
TypeScript
/**
|
|
* @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 {MonoTypeOperatorFunction, ObservableInput, 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<T>(next: (x: T) => void|ObservableInput<any>):
|
|
MonoTypeOperatorFunction<T> {
|
|
return function(source) {
|
|
return source.pipe(switchMap(v => {
|
|
const nextResult = next(v);
|
|
if (nextResult) {
|
|
return from(nextResult).pipe(map(() => v));
|
|
}
|
|
return from([v]);
|
|
}));
|
|
};
|
|
}
|