TypeError is emitted when no default value is set on @Input properties

[mlegenhausen]

Using

• [email protected]
• [email protected]

It should be document that you get an error if you try to assign to an input property without an default value:

@Component({
  selector: 'app',
  template: 'Hello {{ ctrl.value }}'
})
class App {
  // @Input() value; does not work cause the decorators transform will mark the property as not writeable if no initializer is given.
  @Input() value = null; // This works 
}

[panjiesw]

Shouldn't you use it like below?

...
@Input() value;
...

Input and any other decorator returns metadata Function i think...

[mlegenhausen]

Nice hint I forgot the ().

[timkindberg]

Did that fix it or is it still a bug?

[mlegenhausen]

The change was introduced to babel-transform-decorators-lagacy here: loganfsmyth/babel-plugin-transform-decorators-legacy@9eefc32

I don't think it is a bug it seems to a feature, but when following the documentation of ng-forward you get an error. I will open an issue at babel-transform-decorators-lagacy.

[mlegenhausen]

There is already an issue loganfsmyth/babel-plugin-transform-decorators-legacy#14.