Check for optional UZIP dependency throws error (for large images)

[1j01]

This line throws ReferenceError: UZIP is not defined: https://github.com/photopea/UPNG.js/blob/a4eafb5c77072162be3a6d968ac67d238a9d01ac/UPNG.js#L813

It should use typeof to safely check for the existence of a global, like so:

    var CMPR = (data.length>10e6 && typeof UZIP!="undefined" && UZIP!=null) ? UZIP : pako;

The UZIP!=null part is still useful in case for example anyone was working around this by setting window.UZIP = null;

[photopea]

What if I check

window.UZIP!=null

that should work, right?

[1j01]

Yes, that should be fine. The only difference would be in non-browser environments, which probably aren't supported.

[photopea]

Ok, I have uploaded a new version.