Which TypeScript class does SVG's beginElement() method belong to?

Question

SVG has a beginElement() method . But I cant seem to locate it in lib.d.ts. Currently I have to cast the variable to 'any' to call it from TypeScript without any errors.

Can someone point me to the exact TypeScript class that contains that method?

Answer 1

The definition for that is not present. However you can quite easily add it yourself as typescript interfaces are open-ended:

interface SVGElement extends Element {
    beginElement(): SVGElement;
}

var foo = new SVGElement();
foo.beginElement();

Answer 2

If you use animationTransform you should extend SVGAnimationElement:

interface SVGAnimateTransformElement extends SVGAnimationElement {
      beginElement(): SVGAnimateTransformElement;
}