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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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| .. | ||
| benchpress | ||
| common | ||
| compiler | ||
| compiler-cli | ||
| core | ||
| docs | ||
| examples | ||
| facade | ||
| forms | ||
| http | ||
| language-service | ||
| platform-browser | ||
| platform-browser-dynamic | ||
| platform-server | ||
| platform-webworker | ||
| platform-webworker-dynamic | ||
| router | ||
| upgrade | ||
| license-banner.txt | ||
| README.md | ||
| router-license-banner.txt | ||