feat: only install polyfill if there is no native support

[pastc]

By default the BarcodeDetector polyfill was always install on all platforms. That came at a performance cost in raw scanning speed on supporting platforms that already had native support for the Barcode Detection API.

Since the Barcode Detection API is fully implemented on safari, there is no point on using the polyfill everywhere.

[gruhn]

Sorry, now that I think about it, this might break applications with SSR (Server Side Rending). I think the BarcodeDetector polyfill would get applied during SSR but at this point globalThis is not window so the polyfill is never available at runtime. Maybe it's better to use something like:

function newBarcodeDetector(...args) {
  if ('BarcodeDetector' in window) {
    return new window.BarcodeDetector(...ags)
  } else {
    return new BarcodeDetector(...args)
  }
}

PS: that permission issue with the Github action is annoying. I'll see how to work around that.

[gruhn]

Nevermind, I don't know how to preview deploy this fork branch. I'm merged into a local branch and I'll take care of SSR.

[pastc]

Thanks!