libheif-bundle.mjs is libheif-js 1.23.2, an unmodified Emscripten build of libheif:
  https://github.com/catdad-experiments/libheif-js/tree/1.23.2
  https://github.com/strukturag/libheif
libheif is distributed under the GNU Lesser General Public License, version 3: see LICENSE.txt.
You may replace this file with another build of libheif-js.