These steps worked for me on macOS 10.14
It took forever to build emsdk but once it was done.
I could build examples with:
emrun --browser chrome bin/3DPrimitivesExample.html
I’ll update the setup guide accordingly ( the git url now points to https://github.com/emscripten-core/emsdk )
Note: Might be good to remove old installs of emsdk and any .emscripten files in your home folder before installing/building emsdk as above.