d169c2434e
- Introduce `InjectionToken<T>` which is a parameterized and type-safe
version of `OpaqueToken`.
DEPRECATION:
- `OpaqueToken` is now deprecated, use `InjectionToken<T>` instead.
- `Injector.get(token: any, notFoundValue?: any): any` is now deprecated
use the same method which is now overloaded as
`Injector.get<T>(token: Type<T>|InjectionToken<T>, notFoundValue?: T): T;`.
Migration
- Replace `OpaqueToken` with `InjectionToken<?>` and parameterize it.
- Migrate your code to only use `Type<?>` or `InjectionToken<?>` as
injection tokens. Using other tokens will not be supported in the
future.
BREAKING CHANGE:
- Because `injector.get()` is now parameterize it is possible that code
which used to work no longer type checks. Example would be if one
injects `Foo` but configures it as `{provide: Foo, useClass: MockFoo}`.
The injection instance will be that of `MockFoo` but the type will be
`Foo` instead of `any` as in the past. This means that it was possible
to call a method on `MockFoo` in the past which now will fail type
check. See this example:
```
class Foo {}
class MockFoo extends Foo {
setupMock();
}
var PROVIDERS = [
{provide: Foo, useClass: MockFoo}
];
...
function myTest(injector: Injector) {
var foo = injector.get(Foo);
// This line used to work since `foo` used to be `any` before this
// change, it will now be `Foo`, and `Foo` does not have `setUpMock()`.
// The fix is to downcast: `injector.get(Foo) as MockFoo`.
foo.setUpMock();
}
```
PR Close #13785
36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {ANALYZE_FOR_ENTRY_COMPONENTS, Component, ComponentFactoryResolver, Inject, InjectionToken} from '@angular/core';
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import {BasicComp} from './basic';
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@Component({selector: 'cmp-entryComponents', template: '', entryComponents: [BasicComp]})
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export class CompWithEntryComponents {
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constructor(public cfr: ComponentFactoryResolver) {}
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}
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export const SOME_TOKEN = new InjectionToken('someToken');
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export function provideValueWithEntryComponents(value: any) {
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return [
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{provide: SOME_TOKEN, useValue: value},
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{provide: ANALYZE_FOR_ENTRY_COMPONENTS, useValue: value, multi: true},
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];
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}
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@Component({
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selector: 'comp-entryComponents-provider',
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template: '',
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providers: [provideValueWithEntryComponents([{a: 'b', component: BasicComp}])]
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})
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export class CompWithAnalyzeEntryComponentsProvider {
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constructor(public cfr: ComponentFactoryResolver, @Inject(SOME_TOKEN) public providedValue: any) {
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}
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}
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