libheif-js 1.23.5: unmodified browser library, LGPL-3.0.
Corresponding sources and build instructions: all four archives here.
Use libheif-emscripten workflow with libheif sources placed at libheif/.
The build uses Emscripten 3.1.61 and libde265 1.0.15.
Then use libheif-js scripts/install.js and scripts/bundle.js.
GNU LGPL/GPL notices: ../LIBHEIF-LICENSE.txt.
You may replace /vendor/photo/libheif.mjs with a modified build;
the application imports its public API and imposes no integrity check.