b64a276d4b
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 opaque token.
For this reson why declare the return value of `defineInjectable` as `never`.
PR Close #23383
55 lines
2.0 KiB
TypeScript
55 lines
2.0 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 {DoCheck, OnChanges, SimpleChanges} from '../../src/core';
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import {DirectiveDef, NgOnChangesFeature, defineDirective} from '../../src/render3/index';
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describe('define', () => {
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describe('component', () => {
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describe('NgOnChangesFeature', () => {
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it('should patch class', () => {
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class MyDirective implements OnChanges, DoCheck {
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public log: string[] = [];
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public valA: string = 'initValue';
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public set valB(value: string) { this.log.push(value); }
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public get valB() { return 'works'; }
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ngDoCheck(): void { this.log.push('ngDoCheck'); }
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ngOnChanges(changes: SimpleChanges): void {
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this.log.push('ngOnChanges');
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this.log.push('valA', changes['valA'].previousValue, changes['valA'].currentValue);
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this.log.push('valB', changes['valB'].previousValue, changes['valB'].currentValue);
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}
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static ngDirectiveDef = defineDirective({
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type: MyDirective,
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selectors: [['', 'myDir', '']],
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factory: () => new MyDirective(),
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features: [NgOnChangesFeature()],
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inputs: {valA: 'valA', valB: 'valB'}
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});
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}
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const myDir =
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(MyDirective.ngDirectiveDef as DirectiveDef<MyDirective>).factory() as MyDirective;
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myDir.valA = 'first';
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expect(myDir.valA).toEqual('first');
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myDir.valB = 'second';
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expect(myDir.log).toEqual(['second']);
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expect(myDir.valB).toEqual('works');
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myDir.log.length = 0;
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(MyDirective.ngDirectiveDef as DirectiveDef<MyDirective>).doCheck !.call(myDir);
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expect(myDir.log).toEqual([
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'ngOnChanges', 'valA', 'initValue', 'first', 'valB', undefined, 'second', 'ngDoCheck'
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]);
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});
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});
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});
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});
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