Copy Tex is broken

[Mister-Hope]

I don't think this file is a valid javascript file, the file is packed and published to NPM AS-IS, while it's containing type declaration:

function closestKatex(node: Node): ?Element {
    // If node is a Text Node, for example, go up to containing Element,
    // where we can apply the `closest` method.
    const element: ?Element =

document.addEventListener('copy', function(event: ClipboardEvent) {

This breaks the copy feature.

[rage73]

Hi, I would like to work on this issue