git clone https://github.com/eile/draco.git
cd draco
git checkout esri
mkdir build
cd build
source ~/dev/emsdk-1.38.31/emsdk_env.sh
cmake -GNinja -DCMAKE_TOOLCHAIN_FILE=${EMSCRIPTEN}/cmake/Modules/Platform/Emscripten.cmake -DENABLE_EXTRA_SPEED=ON -DENABLE_WASM=ON ..
ninja
cp draco_decoder.js draco_decoder.wasm ../../arcgis-js-api-4/esri/libs/draco/
sed -i 's/const version/var version/' ../../arcgis-js-api-4/esri/libs/draco/draco_decoder.js