chore: bump to latest typescript 2.2

[Hotell]

Current behavior

We are using RC which doesn't work as it should.

There are important errors with stable branch ( when used for mixins )

se related issue microsoft/TypeScript#338 (comment)

So as it turns out, at this moment we have 2 options how to reuse property definitions etc:

• via decorators -> which are not augmenting Class prototype definition and so property name would need to be redefined by definition time Feature request: Analyze class decorators for modifications of the decorated class's prototype  microsoft/TypeScript#8250

type ButtonProps = {...} & ColoredProps & DisabledProps;

@Colored()
@Disabled()
class Button extends Component<ButtonProps>{
   @prop ghost: boolean;
   @prop block: boolean;
   
   // redeclare props :(
   color: ColorType;
   disabled: boolean;
}

• via inheritance -> instead of class extends Component<any> --> class extends Disabled

class ColoredAndDisabled extends Component<Props>{
   static get props(){
       return {
          disabled: prop.boolean(),
          color: prop.string(),
       }
   }

   color: ColorType;
   disabled: boolean;
   
}

class Button extends ColoredAndDisabled {
   @prop ghost: boolean;
   @prop block: boolean;
   
      // no redeclare needed :) ! but this is not composable - because how inheritance works
}

this is very unfortunate indeed ( limitation of Typescript - it works ofc within Vanilla JS.

There is one last hope - to try define mixins via our custom @prop decorator TODO @Hotell

Expected behavior

bump to stable latest TSC and resolve issues

[Hotell]

yay works!

export function Colored<BC extends Constructable<{}>>( Base: BC ) {
  class ColoredCmp extends Base {
    @prop({type: String, attribute: { source: true }}) color?: ColorType;
  };

  return ColoredCmp;
}