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
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| .. | ||
| @angular | ||
| angular1_router | ||
| benchmarks | ||
| benchmarks_external | ||
| e2e_util | ||
| payload_tests/hello_world/ts | ||
| playground | ||
| rollup-test | ||
| empty.ts | ||
| es6-subset.d.ts | ||
| system.d.ts | ||
| tsconfig.json | ||
| types.d.ts | ||