f5c8e0989d
## Inheritance Semantics:
Decorators:
1) list the decorators of the class and its parents in the ancestor first order
2) only use the last decorator of each kind (e.g. @Component / ...)
Constructor parameters:
If a class inherits from a parent class and does not declare
a constructor, it inherits the parent class constructor,
and with it the parameter metadata of that parent class.
Lifecycle hooks:
Follow the normal class inheritance model,
i.e. lifecycle hooks of parent classes will be called
even if the method is not overwritten in the child class.
## Example
E.g. the following is a valid use of inheritance and it will
also inherit all metadata:
```
@Directive({selector: 'someDir'})
class ParentDirective {
constructor(someDep: SomeDep) {}
ngOnInit() {}
}
class ChildDirective extends ParentDirective {}
```
Closes #11606
Closes #12892
71 lines
1.8 KiB
TypeScript
71 lines
1.8 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 {NgModuleResolver} from '@angular/compiler/src/ng_module_resolver';
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import {NgModule} from '@angular/core/src/metadata';
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import {stringify} from '../src/facade/lang';
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class SomeClass1 {}
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class SomeClass2 {}
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class SomeClass3 {}
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class SomeClass4 {}
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class SomeClass5 {}
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@NgModule({
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declarations: [SomeClass1],
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imports: [SomeClass2],
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exports: [SomeClass3],
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providers: [SomeClass4],
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entryComponents: [SomeClass5]
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})
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class SomeModule {
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}
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class SimpleClass {}
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export function main() {
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describe('NgModuleResolver', () => {
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let resolver: NgModuleResolver;
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beforeEach(() => { resolver = new NgModuleResolver(); });
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it('should read out the metadata from the class', () => {
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const moduleMetadata = resolver.resolve(SomeModule);
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expect(moduleMetadata).toEqual(new NgModule({
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declarations: [SomeClass1],
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imports: [SomeClass2],
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exports: [SomeClass3],
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providers: [SomeClass4],
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entryComponents: [SomeClass5]
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}));
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});
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it('should throw when simple class has no NgModule decorator', () => {
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expect(() => resolver.resolve(SimpleClass))
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.toThrowError(`No NgModule metadata found for '${stringify(SimpleClass)}'.`);
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});
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it('should support inheriting the metadata', function() {
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@NgModule({id: 'p'})
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class Parent {
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}
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class ChildNoDecorator extends Parent {}
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@NgModule({id: 'c'})
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class ChildWithDecorator extends Parent {
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}
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expect(resolver.resolve(ChildNoDecorator)).toEqual(new NgModule({id: 'p'}));
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expect(resolver.resolve(ChildWithDecorator)).toEqual(new NgModule({id: 'c'}));
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});
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});
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}
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