2c09b707ce
Ivy definition looks something like this:
```
class MyService {
static ngInjectableDef = defineInjectable({
…
});
}
```
Here the argument to `defineInjectable` is well known public contract which needs
to be honored in backward compatible way between versions. The type of the
return value of `defineInjectable` on the other hand is private and can change
shape drastically between versions without effecting backwards compatibility of
libraries publish to NPM. To our users it is effectively an `OpaqueToken`.
By prefixing the type with `ɵ` we are communicating the the outside world that
the value is not public API and is subject to change without backward compatibility.
PR Close #23371
38 lines
954 B
TypeScript
38 lines
954 B
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 {Injector, createInjector, defineInjectable, defineInjector, ɵInjectableDef, ɵInjectorDef} from '@angular/core';
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export class RootService {
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static ngInjectableDef = defineInjectable({
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providedIn: 'root',
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factory: () => new RootService(),
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});
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}
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export class ScopedService {
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static ngInjectableDef = defineInjectable({
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providedIn: null,
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factory: () => new ScopedService(),
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});
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doSomething(): void {
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// tslint:disable-next-line:no-console
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console.log('Ensure this isn\'t tree-shaken.');
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}
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}
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export class DefinedInjector {
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static ngInjectorDef = defineInjector({
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factory: () => new DefinedInjector(),
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providers: [ScopedService],
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});
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}
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export const INJECTOR = createInjector(DefinedInjector);
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