Typescript does not support proper Touch constructor

[dblVs]

Typescript does not support the valid Touch constructor

TypeScript Version: 2.3.1

Code

const a = new Touch({
  identifier: 2,
  target: document.body
})

Expected behavior:
It should not error because this is the valid constructor for Touch.
Actual behavior:
Errors since the constructor for Touch does not accept any parameters.

[dblVs]

It should be:

declare var Touch: {
    prototype: Touch;
    new(touchInit: { 
       target: HTMLElement, 
       identifier: number,
       clientX?: number,
       clientY?: number,
       screenY?: number,
       screenX?: number,
       pageY?: number,
       pageX?: number,
       radiusX?: number,
       radiusY?: number,
       rotationAngle?: number,
       force?: number
     }): Touch;
}

[olegdunkan]

Check it https://github.com/Microsoft/TypeScript/blob/master/lib/lib.dom.d.ts#L11773

declare var Touch: {
    prototype: Touch;
    new(): Touch;
}

There is now parameters in the constructor function

[dblVs]

@olegdunkan I'm sorry, I don't understand you. new(): Touch is not valid as you cannot do new Touch() to create a new one you need and initialisation object with properties target and identifier.

If you meant that that the constructor includes params, I cannot see them.

https://developer.mozilla.org/en-US/docs/Web/API/Touch/Touch

[olegdunkan]

@dblVs you wrote

declare var Touch: {
    prototype: Touch;
    new(touchInit: { 
       target: HTMLElement, 
       identifier: number,
       clientX?: number,
       clientY?: number,
       screenY?: number,
       screenX?: number,
       pageY?: number,
       pageX?: number,
       radiusX?: number,
       radiusY?: number,
       rotationAngle?: number,
       force?: number
     }): Touch;
}

It has got me confused because it doesn't match what I see in current lib.dom.d.ts.
You are right it have to be implemented. Sorry.

[dblVs]

@olegdunkan ok, I edited to be more clear

[mhegazy]

PRs welcomed. You can find more information about contributing lib.d.ts fixes at https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md#contributing-libdts-fixes.

[VarLong]

@dblVs 👍 ,
have you fix the issue? i want creat a touchevent , but the property is read-only,

[VarLong]

@mhegazy

i want to creat a touchEvent , but the constructor need a parametertouch.
const touchEvent = new TouchEvent("touchstart", {
touches: [touch],
targetTouches: [touch],
changedTouches: [touch]
});
.but the constructor of Touch do not need any parameter .

let touch = new Touch();

but i need pageX and pageY ,

[dblVs]

@VarLong I guess I'll add it soon. I didn't do anything on it, but I will these days when i get time.

[saschanaz]

Has been fixed by microsoft/TypeScript-DOM-lib-generator#415

[mbest]

I see that this has been fixed in #24850, but my project is stuck on a 2.x version of TypeScript. How can I use new Touch({...}) without an error?

Edit: using new (Touch as any) works.

[jakebailey]

Just looking at old issues; this has been fixed in lib for a good while.