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models.ts
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models.ts
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/**
* @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 {EnvironmentInjector, EnvironmentProviders, InjectionToken, NgModuleFactory, Provider, Type} from '@angular/core';
import {Observable} from 'rxjs';
import {DeprecatedLoadChildren} from './deprecated_load_children';
import {ActivatedRouteSnapshot, RouterStateSnapshot} from './router_state';
import {UrlSegment, UrlSegmentGroup, UrlTree} from './url_tree';
/**
* Represents a route configuration for the Router service.
* An array of `Route` objects, used in `Router.config` and for nested route configurations
* in `Route.children`.
*
* @see `Route`
* @see `Router`
* @see [Router configuration guide](guide/router-reference#configuration)
* @publicApi
*/
export type Routes = Route[];
/**
* Represents the result of matching URLs with a custom matching function.
*
* * `consumed` is an array of the consumed URL segments.
* * `posParams` is a map of positional parameters.
*
* @see `UrlMatcher()`
* @publicApi
*/
export type UrlMatchResult = {
consumed: UrlSegment[];
posParams?: {[name: string]: UrlSegment};
};
/**
* A function for matching a route against URLs. Implement a custom URL matcher
* for `Route.matcher` when a combination of `path` and `pathMatch`
* is not expressive enough. Cannot be used together with `path` and `pathMatch`.
*
* The function takes the following arguments and returns a `UrlMatchResult` object.
* * *segments* : An array of URL segments.
* * *group* : A segment group.
* * *route* : The route to match against.
*
* The following example implementation matches HTML files.
*
* ```
* export function htmlFiles(url: UrlSegment[]) {
* return url.length === 1 && url[0].path.endsWith('.html') ? ({consumed: url}) : null;
* }
*
* export const routes = [{ matcher: htmlFiles, component: AnyComponent }];
* ```
*
* @publicApi
*/
export type UrlMatcher = (segments: UrlSegment[], group: UrlSegmentGroup, route: Route) =>
UrlMatchResult|null;
/**
*
* Represents static data associated with a particular route.
*
* @see `Route#data`
*
* @publicApi
*/
export type Data = {
[key: string|symbol]: any
};
/**
*
* Represents the resolved data associated with a particular route.
*
* @see `Route#resolve`.
*
* @publicApi
*/
export type ResolveData = {
[key: string|symbol]: any|ResolveFn<unknown>
};
/**
* An ES Module object with a default export of the given type.
*
* @see `Route#loadComponent`
* @see `LoadChildrenCallback`
*
* @publicApi
*/
export interface DefaultExport<T> {
/**
* Default exports are bound under the name `"default"`, per the ES Module spec:
* https://tc39.es/ecma262/#table-export-forms-mapping-to-exportentry-records
*/
default: T;
}
/**
*
* A function that is called to resolve a collection of lazy-loaded routes.
* Must be an arrow function of the following form:
* `() => import('...').then(mod => mod.MODULE)`
* or
* `() => import('...').then(mod => mod.ROUTES)`
*
* For example:
*
* ```
* [{
* path: 'lazy',
* loadChildren: () => import('./lazy-route/lazy.module').then(mod => mod.LazyModule),
* }];
* ```
* or
* ```
* [{
* path: 'lazy',
* loadChildren: () => import('./lazy-route/lazy.routes').then(mod => mod.ROUTES),
* }];
* ```
*
* If the lazy-loaded routes are exported via a `default` export, the `.then` can be omitted:
* ```
* [{
* path: 'lazy',
* loadChildren: () => import('./lazy-route/lazy.routes'),
* }];
*
* @see [Route.loadChildren](api/router/Route#loadChildren)
* @publicApi
*/
export type LoadChildrenCallback = () => Type<any>|NgModuleFactory<any>|Routes|
Observable<Type<any>|Routes|DefaultExport<Type<any>>|DefaultExport<Routes>>|
Promise<NgModuleFactory<any>|Type<any>|Routes|DefaultExport<Type<any>>|DefaultExport<Routes>>;
/**
*
* A function that returns a set of routes to load.
*
* @see `LoadChildrenCallback`
* @publicApi
*/
export type LoadChildren = LoadChildrenCallback|DeprecatedLoadChildren;
/**
*
* How to handle query parameters in a router link.
* One of:
* - `"merge"` : Merge new parameters with current parameters.
* - `"preserve"` : Preserve current parameters.
* - `""` : Replace current parameters with new parameters. This is the default behavior.
*
* @see `UrlCreationOptions#queryParamsHandling`
* @see `RouterLink`
* @publicApi
*/
export type QueryParamsHandling = 'merge'|'preserve'|'';
/**
* A policy for when to run guards and resolvers on a route.
*
* Guards and/or resolvers will always run when a route is activated or deactivated. When a route is
* unchanged, the default behavior is the same as `paramsChange`.
*
* `paramsChange` : Rerun the guards and resolvers when path or
* path param changes. This does not include query parameters. This option is the default.
* - `always` : Run on every execution.
* - `pathParamsChange` : Rerun guards and resolvers when the path params
* change. This does not compare matrix or query parameters.
* - `paramsOrQueryParamsChange` : Run when path, matrix, or query parameters change.
* - `pathParamsOrQueryParamsChange` : Rerun guards and resolvers when the path params
* change or query params have changed. This does not include matrix parameters.
*
* @see [Route.runGuardsAndResolvers](api/router/Route#runGuardsAndResolvers)
* @publicApi
*/
export type RunGuardsAndResolvers =
'pathParamsChange'|'pathParamsOrQueryParamsChange'|'paramsChange'|'paramsOrQueryParamsChange'|
'always'|((from: ActivatedRouteSnapshot, to: ActivatedRouteSnapshot) => boolean);
/**
* A configuration object that defines a single route.
* A set of routes are collected in a `Routes` array to define a `Router` configuration.
* The router attempts to match segments of a given URL against each route,
* using the configuration options defined in this object.
*
* Supports static, parameterized, redirect, and wildcard routes, as well as
* custom route data and resolve methods.
*
* For detailed usage information, see the [Routing Guide](guide/router).
*
* @usageNotes
*
* ### Simple Configuration
*
* The following route specifies that when navigating to, for example,
* `/team/11/user/bob`, the router creates the 'Team' component
* with the 'User' child component in it.
*
* ```
* [{
* path: 'team/:id',
* component: Team,
* children: [{
* path: 'user/:name',
* component: User
* }]
* }]
* ```
*
* ### Multiple Outlets
*
* The following route creates sibling components with multiple outlets.
* When navigating to `/team/11(aux:chat/jim)`, the router creates the 'Team' component next to
* the 'Chat' component. The 'Chat' component is placed into the 'aux' outlet.
*
* ```
* [{
* path: 'team/:id',
* component: Team
* }, {
* path: 'chat/:user',
* component: Chat
* outlet: 'aux'
* }]
* ```
*
* ### Wild Cards
*
* The following route uses wild-card notation to specify a component
* that is always instantiated regardless of where you navigate to.
*
* ```
* [{
* path: '**',
* component: WildcardComponent
* }]
* ```
*
* ### Redirects
*
* The following route uses the `redirectTo` property to ignore a segment of
* a given URL when looking for a child path.
*
* When navigating to '/team/11/legacy/user/jim', the router changes the URL segment
* '/team/11/legacy/user/jim' to '/team/11/user/jim', and then instantiates
* the Team component with the User child component in it.
*
* ```
* [{
* path: 'team/:id',
* component: Team,
* children: [{
* path: 'legacy/user/:name',
* redirectTo: 'user/:name'
* }, {
* path: 'user/:name',
* component: User
* }]
* }]
* ```
*
* The redirect path can be relative, as shown in this example, or absolute.
* If we change the `redirectTo` value in the example to the absolute URL segment '/user/:name',
* the result URL is also absolute, '/user/jim'.
* ### Empty Path
*
* Empty-path route configurations can be used to instantiate components that do not 'consume'
* any URL segments.
*
* In the following configuration, when navigating to
* `/team/11`, the router instantiates the 'AllUsers' component.
*
* ```
* [{
* path: 'team/:id',
* component: Team,
* children: [{
* path: '',
* component: AllUsers
* }, {
* path: 'user/:name',
* component: User
* }]
* }]
* ```
*
* Empty-path routes can have children. In the following example, when navigating
* to `/team/11/user/jim`, the router instantiates the wrapper component with
* the user component in it.
*
* Note that an empty path route inherits its parent's parameters and data.
*
* ```
* [{
* path: 'team/:id',
* component: Team,
* children: [{
* path: '',
* component: WrapperCmp,
* children: [{
* path: 'user/:name',
* component: User
* }]
* }]
* }]
* ```
*
* ### Matching Strategy
*
* The default path-match strategy is 'prefix', which means that the router
* checks URL elements from the left to see if the URL matches a specified path.
* For example, '/team/11/user' matches 'team/:id'.
*
* ```
* [{
* path: '',
* pathMatch: 'prefix', //default
* redirectTo: 'main'
* }, {
* path: 'main',
* component: Main
* }]
* ```
*
* You can specify the path-match strategy 'full' to make sure that the path
* covers the whole unconsumed URL. It is important to do this when redirecting
* empty-path routes. Otherwise, because an empty path is a prefix of any URL,
* the router would apply the redirect even when navigating to the redirect destination,
* creating an endless loop.
*
* In the following example, supplying the 'full' `pathMatch` strategy ensures
* that the router applies the redirect if and only if navigating to '/'.
*
* ```
* [{
* path: '',
* pathMatch: 'full',
* redirectTo: 'main'
* }, {
* path: 'main',
* component: Main
* }]
* ```
*
* ### Componentless Routes
*
* You can share parameters between sibling components.
* For example, suppose that two sibling components should go next to each other,
* and both of them require an ID parameter. You can accomplish this using a route
* that does not specify a component at the top level.
*
* In the following example, 'MainChild' and 'AuxChild' are siblings.
* When navigating to 'parent/10/(a//aux:b)', the route instantiates
* the main child and aux child components next to each other.
* For this to work, the application component must have the primary and aux outlets defined.
*
* ```
* [{
* path: 'parent/:id',
* children: [
* { path: 'a', component: MainChild },
* { path: 'b', component: AuxChild, outlet: 'aux' }
* ]
* }]
* ```
*
* The router merges the parameters, data, and resolve of the componentless
* parent into the parameters, data, and resolve of the children.
*
* This is especially useful when child components are defined
* with an empty path string, as in the following example.
* With this configuration, navigating to '/parent/10' creates
* the main child and aux components.
*
* ```
* [{
* path: 'parent/:id',
* children: [
* { path: '', component: MainChild },
* { path: '', component: AuxChild, outlet: 'aux' }
* ]
* }]
* ```
*
* ### Lazy Loading
*
* Lazy loading speeds up application load time by splitting the application
* into multiple bundles and loading them on demand.
* To use lazy loading, provide the `loadChildren` property in the `Route` object,
* instead of the `children` property.
*
* Given the following example route, the router will lazy load
* the associated module on demand using the browser native import system.
*
* ```
* [{
* path: 'lazy',
* loadChildren: () => import('./lazy-route/lazy.module').then(mod => mod.LazyModule),
* }];
* ```
*
* @publicApi
*/
export interface Route {
/**
* Used to define a page title for the route. This can be a static string or an `Injectable` that
* implements `Resolve`.
*
* @see `PageTitleStrategy`
*/
title?: string|Type<Resolve<string>>|ResolveFn<string>;
/**
* The path to match against. Cannot be used together with a custom `matcher` function.
* A URL string that uses router matching notation.
* Can be a wild card (`**`) that matches any URL (see Usage Notes below).
* Default is "/" (the root path).
*
*/
path?: string;
/**
* The path-matching strategy, one of 'prefix' or 'full'.
* Default is 'prefix'.
*
* By default, the router checks URL elements from the left to see if the URL
* matches a given path and stops when there is a config match. Importantly there must still be a
* config match for each segment of the URL. For example, '/team/11/user' matches the prefix
* 'team/:id' if one of the route's children matches the segment 'user'. That is, the URL
* '/team/11/user' matches the config
* `{path: 'team/:id', children: [{path: ':user', component: User}]}`
* but does not match when there are no children as in `{path: 'team/:id', component: Team}`.
*
* The path-match strategy 'full' matches against the entire URL.
* It is important to do this when redirecting empty-path routes.
* Otherwise, because an empty path is a prefix of any URL,
* the router would apply the redirect even when navigating
* to the redirect destination, creating an endless loop.
*
*/
pathMatch?: 'prefix'|'full';
/**
* A custom URL-matching function. Cannot be used together with `path`.
*/
matcher?: UrlMatcher;
/**
* The component to instantiate when the path matches.
* Can be empty if child routes specify components.
*/
component?: Type<any>;
/**
* An object specifying a lazy-loaded component.
*/
loadComponent?: () => Type<unknown>| Observable<Type<unknown>|DefaultExport<Type<unknown>>>|
Promise<Type<unknown>|DefaultExport<Type<unknown>>>;
/**
* Filled for routes `loadComponent` once the component is loaded.
* @internal
*/
_loadedComponent?: Type<unknown>;
/**
* A URL to redirect to when the path matches.
*
* Absolute if the URL begins with a slash (/), otherwise relative to the path URL.
* Note that no further redirects are evaluated after an absolute redirect.
*
* When not present, router does not redirect.
*/
redirectTo?: string;
/**
* Name of a `RouterOutlet` object where the component can be placed
* when the path matches.
*/
outlet?: string;
/**
* An array of `CanActivateFn` or DI tokens used to look up `CanActivate()`
* handlers, in order to determine if the current user is allowed to
* activate the component. By default, any user can activate.
*
* When using a function rather than DI tokens, the function can call `inject` to get any required
* dependencies. This `inject` call must be done in a synchronous context.
*/
canActivate?: Array<CanActivateFn|any>;
/**
* An array of `CanMatchFn` or DI tokens used to look up `CanMatch()`
* handlers, in order to determine if the current user is allowed to
* match the `Route`. By default, any route can match.
*
* When using a function rather than DI tokens, the function can call `inject` to get any required
* dependencies. This `inject` call must be done in a synchronous context.
*/
canMatch?: Array<Type<CanMatch>|InjectionToken<CanMatchFn>|CanMatchFn>;
/**
* An array of `CanActivateChildFn` or DI tokens used to look up `CanActivateChild()` handlers,
* in order to determine if the current user is allowed to activate
* a child of the component. By default, any user can activate a child.
*
* When using a function rather than DI tokens, the function can call `inject` to get any required
* dependencies. This `inject` call must be done in a synchronous context.
*/
canActivateChild?: Array<CanActivateChildFn|any>;
/**
* An array of `CanDeactivateFn` or DI tokens used to look up `CanDeactivate()`
* handlers, in order to determine if the current user is allowed to
* deactivate the component. By default, any user can deactivate.
*
* When using a function rather than DI tokens, the function can call `inject` to get any required
* dependencies. This `inject` call must be done in a synchronous context.
*/
canDeactivate?: Array<CanDeactivateFn<any>|any>;
/**
* An array of `CanLoadFn` or DI tokens used to look up `CanLoad()`
* handlers, in order to determine if the current user is allowed to
* load the component. By default, any user can load.
*
* When using a function rather than DI tokens, the function can call `inject` to get any required
* dependencies. This `inject` call must be done in a synchronous context.
*/
canLoad?: Array<CanLoadFn|any>;
/**
* Additional developer-defined data provided to the component via
* `ActivatedRoute`. By default, no additional data is passed.
*/
data?: Data;
/**
* A map of DI tokens used to look up data resolvers. See `Resolve`.
*/
resolve?: ResolveData;
/**
* An array of child `Route` objects that specifies a nested route
* configuration.
*/
children?: Routes;
/**
* An object specifying lazy-loaded child routes.
*/
loadChildren?: LoadChildren;
/**
* Defines when guards and resolvers will be run. One of
* - `paramsOrQueryParamsChange` : Run when query parameters change.
* - `always` : Run on every execution.
* By default, guards and resolvers run only when the matrix
* parameters of the route change.
*
* @see RunGuardsAndResolvers
*/
runGuardsAndResolvers?: RunGuardsAndResolvers;
/**
* A `Provider` array to use for this `Route` and its `children`.
*
* The `Router` will create a new `EnvironmentInjector` for this
* `Route` and use it for this `Route` and its `children`. If this
* route also has a `loadChildren` function which returns an `NgModuleRef`, this injector will be
* used as the parent of the lazy loaded module.
*/
providers?: Array<Provider|EnvironmentProviders>;
/**
* Injector created from the static route providers
* @internal
*/
_injector?: EnvironmentInjector;
/**
* Filled for routes with `loadChildren` once the routes are loaded.
* @internal
*/
_loadedRoutes?: Route[];
/**
* Filled for routes with `loadChildren` once the routes are loaded
* @internal
*/
_loadedInjector?: EnvironmentInjector;
}
export interface LoadedRouterConfig {
routes: Route[];
injector: EnvironmentInjector|undefined;
}
/**
* @description
*
* Interface that a class can implement to be a guard deciding if a route can be activated.
* If all guards return `true`, navigation continues. If any guard returns `false`,
* navigation is cancelled. If any guard returns a `UrlTree`, the current navigation
* is cancelled and a new navigation begins to the `UrlTree` returned from the guard.
*
* The following example implements a `CanActivate` function that checks whether the
* current user has permission to activate the requested route.
*
* ```
* class UserToken {}
* class Permissions {
* canActivate(): boolean {
* return true;
* }
* }
*
* @Injectable()
* class CanActivateTeam implements CanActivate {
* constructor(private permissions: Permissions, private currentUser: UserToken) {}
*
* canActivate(
* route: ActivatedRouteSnapshot,
* state: RouterStateSnapshot
* ): Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree {
* return this.permissions.canActivate(this.currentUser, route.params.id);
* }
* }
* ```
*
* Here, the defined guard function is provided as part of the `Route` object
* in the router configuration:
*
* ```
* @NgModule({
* imports: [
* RouterModule.forRoot([
* {
* path: 'team/:id',
* component: TeamComponent,
* canActivate: [CanActivateTeam]
* }
* ])
* ],
* providers: [CanActivateTeam, UserToken, Permissions]
* })
* class AppModule {}
* ```
*
* You can alternatively provide an in-line function with the `CanActivateFn` signature:
*
* ```
* @NgModule({
* imports: [
* RouterModule.forRoot([
* {
* path: 'team/:id',
* component: TeamComponent,
* canActivate: [(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) => true]
* }
* ])
* ],
* })
* class AppModule {}
* ```
*
* @publicApi
*/
export interface CanActivate {
canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot):
Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree;
}
/**
* The signature of a function used as a `canActivate` guard on a `Route`.
*
* @publicApi
* @see `CanActivate`
* @see `Route`
*/
export type CanActivateFn = (route: ActivatedRouteSnapshot, state: RouterStateSnapshot) =>
Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree;
/**
* @description
*
* Interface that a class can implement to be a guard deciding if a child route can be activated.
* If all guards return `true`, navigation continues. If any guard returns `false`,
* navigation is cancelled. If any guard returns a `UrlTree`, current navigation
* is cancelled and a new navigation begins to the `UrlTree` returned from the guard.
*
* The following example implements a `CanActivateChild` function that checks whether the
* current user has permission to activate the requested child route.
*
* ```
* class UserToken {}
* class Permissions {
* canActivate(user: UserToken, id: string): boolean {
* return true;
* }
* }
*
* @Injectable()
* class CanActivateTeam implements CanActivateChild {
* constructor(private permissions: Permissions, private currentUser: UserToken) {}
*
* canActivateChild(
* route: ActivatedRouteSnapshot,
* state: RouterStateSnapshot
* ): Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree {
* return this.permissions.canActivate(this.currentUser, route.params.id);
* }
* }
* ```
*
* Here, the defined guard function is provided as part of the `Route` object
* in the router configuration:
*
* ```
* @NgModule({
* imports: [
* RouterModule.forRoot([
* {
* path: 'root',
* canActivateChild: [CanActivateTeam],
* children: [
* {
* path: 'team/:id',
* component: TeamComponent
* }
* ]
* }
* ])
* ],
* providers: [CanActivateTeam, UserToken, Permissions]
* })
* class AppModule {}
* ```
*
* You can alternatively provide an in-line function with the `CanActivateChildFn` signature:
*
* ```
* @NgModule({
* imports: [
* RouterModule.forRoot([
* {
* path: 'root',
* canActivateChild: [(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) => true],
* children: [
* {
* path: 'team/:id',
* component: TeamComponent
* }
* ]
* }
* ])
* ],
* })
* class AppModule {}
* ```
*
* @publicApi
*/
export interface CanActivateChild {
canActivateChild(childRoute: ActivatedRouteSnapshot, state: RouterStateSnapshot):
Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree;
}
/**
* The signature of a function used as a `canActivateChild` guard on a `Route`.
*
* @publicApi
* @see `CanActivateChild`
* @see `Route`
*/
export type CanActivateChildFn = (childRoute: ActivatedRouteSnapshot, state: RouterStateSnapshot) =>
Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree;
/**
* @description
*
* Interface that a class can implement to be a guard deciding if a route can be deactivated.
* If all guards return `true`, navigation continues. If any guard returns `false`,
* navigation is cancelled. If any guard returns a `UrlTree`, current navigation
* is cancelled and a new navigation begins to the `UrlTree` returned from the guard.
*
* The following example implements a `CanDeactivate` function that checks whether the
* current user has permission to deactivate the requested route.
*
* ```
* class UserToken {}
* class Permissions {
* canDeactivate(user: UserToken, id: string): boolean {
* return true;
* }
* }
* ```
*
* Here, the defined guard function is provided as part of the `Route` object
* in the router configuration:
*
* ```
*
* @Injectable()
* class CanDeactivateTeam implements CanDeactivate<TeamComponent> {
* constructor(private permissions: Permissions, private currentUser: UserToken) {}
*
* canDeactivate(
* component: TeamComponent,
* currentRoute: ActivatedRouteSnapshot,
* currentState: RouterStateSnapshot,
* nextState: RouterStateSnapshot
* ): Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree {
* return this.permissions.canDeactivate(this.currentUser, route.params.id);
* }
* }
*
* @NgModule({
* imports: [
* RouterModule.forRoot([
* {
* path: 'team/:id',
* component: TeamComponent,
* canDeactivate: [CanDeactivateTeam]
* }
* ])
* ],
* providers: [CanDeactivateTeam, UserToken, Permissions]
* })
* class AppModule {}
* ```
*
* You can alternatively provide an in-line function with the `CanDeactivateFn` signature:
*
* ```
* @NgModule({
* imports: [
* RouterModule.forRoot([
* {
* path: 'team/:id',
* component: TeamComponent,
* canDeactivate: [(component: TeamComponent, currentRoute: ActivatedRouteSnapshot,
* currentState: RouterStateSnapshot, nextState: RouterStateSnapshot) => true]
* }
* ])
* ],
* })
* class AppModule {}
* ```
*
* @publicApi
*/
export interface CanDeactivate<T> {
canDeactivate(
component: T, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot,
nextState: RouterStateSnapshot): Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean
|UrlTree;
}
/**
* The signature of a function used as a `canDeactivate` guard on a `Route`.
*
* @publicApi
* @see `CanDeactivate`
* @see `Route`
*/
export type CanDeactivateFn<T> =
(component: T, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot,
nextState: RouterStateSnapshot) =>
Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree;
/**
* @description
*
* Interface that a class can implement to be a guard deciding if a `Route` can be matched.
* If all guards return `true`, navigation continues and the `Router` will use the `Route` during
* activation. If any guard returns `false`, the `Route` is skipped for matching and other `Route`
* configurations are processed instead.
*
* The following example implements a `CanMatch` function that decides whether the
* current user has permission to access the users page.
*
*
* ```
* class UserToken {}
* class Permissions {
* canAccess(user: UserToken, id: string, segments: UrlSegment[]): boolean {
* return true;
* }
* }
*
* @Injectable()
* class CanMatchTeamSection implements CanMatch {
* constructor(private permissions: Permissions, private currentUser: UserToken) {}
*
* canMatch(route: Route, segments: UrlSegment[]): Observable<boolean>|Promise<boolean>|boolean {
* return this.permissions.canAccess(this.currentUser, route, segments);
* }
* }
* ```
*
* Here, the defined guard function is provided as part of the `Route` object
* in the router configuration:
*
* ```
*
* @NgModule({
* imports: [
* RouterModule.forRoot([
* {
* path: 'team/:id',
* component: TeamComponent,
* loadChildren: () => import('./team').then(mod => mod.TeamModule),
* canMatch: [CanMatchTeamSection]
* },
* {
* path: '**',
* component: NotFoundComponent
* }
* ])
* ],
* providers: [CanMatchTeamSection, UserToken, Permissions]
* })
* class AppModule {}
* ```
*
* If the `CanMatchTeamSection` were to return `false`, the router would continue navigating to the
* `team/:id` URL, but would load the `NotFoundComponent` because the `Route` for `'team/:id'`
* could not be used for a URL match but the catch-all `**` `Route` did instead.
*
* You can alternatively provide an in-line function with the `CanMatchFn` signature:
*
* ```
* @NgModule({
* imports: [
* RouterModule.forRoot([
* {
* path: 'team/:id',
* component: TeamComponent,
* loadChildren: () => import('./team').then(mod => mod.TeamModule),
* canMatch: [(route: Route, segments: UrlSegment[]) => true]
* },
* {
* path: '**',
* component: NotFoundComponent
* }
* ])
* ],
* })
* class AppModule {}
* ```
*
* @publicApi
*/
export interface CanMatch {
canMatch(route: Route, segments: UrlSegment[]):
Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree;
}
/**
* The signature of a function used as a `CanMatch` guard on a `Route`.
*
* @publicApi
* @see `CanMatch`
* @see `Route`
*/
export type CanMatchFn = (route: Route, segments: UrlSegment[]) =>
Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree;
/**
* @description
*
* Interface that classes can implement to be a data provider.
* A data provider class can be used with the router to resolve data during navigation.
* The interface defines a `resolve()` method that is invoked right after the `ResolveStart`
* router event. The router waits for the data to be resolved before the route is finally activated.
*
* The following example implements a `resolve()` method that retrieves the data
* needed to activate the requested route.
*
* ```
* @Injectable({ providedIn: 'root' })
* export class HeroResolver implements Resolve<Hero> {
* constructor(private service: HeroService) {}
*
* resolve(
* route: ActivatedRouteSnapshot,
* state: RouterStateSnapshot
* ): Observable<Hero>|Promise<Hero>|Hero {
* return this.service.getHero(route.paramMap.get('id'));
* }
* }
* ```
*
* Here, the defined `resolve()` function is provided as part of the `Route` object
* in the router configuration:
*
* ```
* @NgModule({
* imports: [
* RouterModule.forRoot([