@angular/router
Version:
Angular - the routing library
42 lines • 7.26 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { combineLatest } from 'rxjs';
import { filter, map, scan, startWith, switchMap, take } from 'rxjs/operators';
import { isUrlTree } from '../utils/type_guards';
const INITIAL_VALUE = Symbol('INITIAL_VALUE');
export function prioritizedGuardValue() {
return switchMap(obs => {
return combineLatest(obs.map(o => o.pipe(take(1), startWith(INITIAL_VALUE))))
.pipe(scan((acc, list) => {
let isPending = false;
return list.reduce((innerAcc, val, i) => {
if (innerAcc !== INITIAL_VALUE)
return innerAcc;
// Toggle pending flag if any values haven't been set yet
if (val === INITIAL_VALUE)
isPending = true;
// Any other return values are only valid if we haven't yet hit a pending
// call. This guarantees that in the case of a guard at the bottom of the
// tree that returns a redirect, we will wait for the higher priority
// guard at the top to finish before performing the redirect.
if (!isPending) {
// Early return when we hit a `false` value as that should always
// cancel navigation
if (val === false)
return val;
if (i === list.length - 1 || isUrlTree(val)) {
return val;
}
}
return innerAcc;
}, acc);
}, INITIAL_VALUE), filter(item => item !== INITIAL_VALUE), map(item => isUrlTree(item) ? item : item === true), //
take(1));
});
}
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