Class method does not emit 'design:returntype' and 'design:type'

[Sze Ka Wai Raymond]

const decorator = (): PropertyDecorator => {
  return (target: object, propertyKey: string | symbol) => {
    console.log(Reflect.getMetadataKeys(target, propertyKey));
  };
};

class Testing2 {
  @decorator()
  test(): string {
    return 'hello';
  }
}

using tsc, it would print [ 'design:returntype', 'design:paramtypes', 'design:type' ]
using babel with this plugin, it would print [ 'design:paramtypes' ]

[Leonardo Ascione]

This is going to be published today with #24