Install emscripten http://lmgtfy.com/?q=install+the+emscripten+sdk
git clone https://github.com/juj/emsdk.git cd emsdk ./emsdk install latest ./emsdk activate latest source ./emsdk_env.sh
Install piexwasm project components
cd chrome/src/ui/file_manager/image_loader/piex npm install
Build piexwasm code: piex.js.wasm piex.out.wasm
npm run build
Run tests: they must PASS
npm run test
Release: submit piex.js.wasm piex.out.wasm to the Chromium repository
git commit -a -m "Release piexwasm ..." git cl upload