jquery - Typescript 0.9.5 compilation with var args fails

Question

So im trying to upgrade to typescript 0.9.5 in our project, but im currently stuck.

This is the error im reciving from the compiler:

error TS2082: Supplied parameters do not match any signature of call target:
Call signatures of types '(event: JQueryEventObject, component: any,
     mouseClickPagePosition: any) => void' and 
    '(eventObject: JQueryEventObject, ...args: any[]) => any' are incompatible:
                Call signature expects 1 or fewer parameters.

It seems like this code:

jQuery('selector').on('event',
            (event, component, mouseClickPagePosition) => {
              // code
            });

cannot be used with this jQuery definition:

on(events: string, handler: (eventObject: JQueryEventObject, ...args: any[]) => any): JQuery;

But the method signatures seems to add up?

Answer 1

This code

jQuery('selector').on('event',
            (event, component, mouseClickPagePosition) => {
              // code
            });

should be written as this instead:

jQuery('selector').on('event',
            (event, component?, mouseClickPagePosition?) => {
              // code
            });

The callback on on specifies that it will be called with at least one parameter, and possibly more. The callback provided required three parameters, so it's considered an error.

This code was only accidently allowed pre-0.9.5, but given how annoying/unintuitive this is, it's being considered as a design change to allow these parameters to be 'required' instead of optional.