HEIC decoder used by xhdr.app

Browsers without a built-in HEIC decoder (Chrome, Edge, Firefox) decode HEIC/HEIF photos
on the device with this library. Safari decodes HEIC itself and never loads it.

libheif.js is libheif-js 1.23.5 (npm, LGPL-3.0), file libheif/libheif.js, with one line
appended so it loads as an ES module:
  export default libheif;
  upstream file sha256  2256ffee78039843ac47581b731bf837e4a29f08ffa91b7409caebd89a6968ea
  this file sha256      c0b106fcdcdde08bd0409aea4c3d576ef73b221561da0f6333d76e40a76cc4c9
  npm tarball           https://registry.npmjs.org/libheif-js/-/libheif-js-1.23.5.tgz
  tarball integrity     sha512-umXZPthnWZtF3iG/5mQG+AZ2V6i0UeYpo3z2CkggTEgL8dKmIIwJT6TDuAMuabXa1yTW8uJ1ZAgR+CxNTklYYw==

It is compiled to plain JavaScript with Emscripten (no WebAssembly) from:
  libheif 1.23.5    LGPL-3.0   https://github.com/strukturag/libheif (tag v1.23.5)
  libde265 1.0.15   LGPL-3.0   https://github.com/strukturag/libde265 (tag v1.0.15)
  build             https://github.com/catdad-experiments/libheif-emscripten (release v1.23.5)
  package           https://github.com/catdad-experiments/libheif-js

LICENSE holds the license texts: GNU LGPL v3.0 and the GNU GPL v3.0 it builds on.
The site loads libheif.js as a separate file, so it can be replaced with another build of
the same library.