These are pre-built binaries of liblouis for Javascript environments. Binaries are created by cross-compiling the C implementation using emscripten. This is not the main repository for the Javascript implementation, but a helper repository used by the Javascript implementation located at liblouis/liblouis-js.
If you are new to liblouis you are probably looking for the official website, the official documentation or the repository of the C implementation at liblouis/liblouis.
Report bugs in table files at liblouis/liblouis. Report issues with the javascript implementation at liblouis/liblouis-js.