Disable Pinch Zoom on iOS 10+ Safari - React and TypeScript

Question

according to disable viewport zooming iOS 10+ safari? there is a need to override this in the following way (in JS):

document.addEventListener('touchmove', function (event) {
  if (event.scale !== 1) { event.preventDefault(); }
}, false);

However in TypeScript this gives:

[ts] Property 'scale' does not exist on type 'TouchEvent'. [2339]

I have tried to use the solutions at Does TypeScript support TouchEvent? - but to no avail.

Does anyone know how to incorporate a touchevent into TypeScript?