Does TypeScript support TouchEvent?

Question

UPDATE

TypeScript 1.5.3 added declarations for HTML Touch events to lib.d.ts

I can see that it supports UIEven

Answer 1

You have several options here:

First option: Extend UIEvent to have the members you'd expect on a TouchEvent (and only use them in touch event listeners):

interface UIEvent {
    targetTouches: { pageX: number; pageY: number; }[];
    // etc...
}

Second option: Define your own TouchEvent interface and add a type assertion when binding the event

interface TouchEvent {
    (event: TouchEventArgs): void;
}

interface TouchEventArgs {
    targetTouches: { pageX: number; pageY: number; }[];
    // etc
}

 theElement.addEventListener("touchstart", ((theTouchEvent:TouchEvent) => alert("touchy")));