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
50 lines
1.3 KiB
TypeScript
50 lines
1.3 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 {isPromise} from '../src/util/lang';
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import {Inject, Injectable, InjectionToken, Optional} from './di';
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/**
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* A function that will be executed when an application is initialized.
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* @experimental
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*/
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export const APP_INITIALIZER = new InjectionToken<Array<() => void>>('Application Initializer');
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/**
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* A class that reflects the state of running {@link APP_INITIALIZER}s.
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*
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* @experimental
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*/
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@Injectable()
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export class ApplicationInitStatus {
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private _donePromise: Promise<any>;
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private _done = false;
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constructor(@Inject(APP_INITIALIZER) @Optional() appInits: (() => any)[]) {
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const asyncInitPromises: Promise<any>[] = [];
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if (appInits) {
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for (let i = 0; i < appInits.length; i++) {
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const initResult = appInits[i]();
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if (isPromise(initResult)) {
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asyncInitPromises.push(initResult);
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}
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}
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}
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this._donePromise = Promise.all(asyncInitPromises).then(() => { this._done = true; });
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if (asyncInitPromises.length === 0) {
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this._done = true;
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}
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}
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get done(): boolean { return this._done; }
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get donePromise(): Promise<any> { return this._donePromise; }
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}
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