Install emscripten https://emscripten.org/docs/getting_started/index.html
```shell
git clone https://github.com/emscripten-core/emsdk.git
cd emsdk
./emsdk install 1.38.33
./emsdk activate 1.38.33
source ./emsdk_env.sh
```
Install piexwasm project components
```shell
cd chrome/src/ui/file_manager/image_loader/piex
npm install
```
Build piexwasm code: piex.js.wasm piex.out.wasm
```shell
npm run build
```
Run tests: they must PASS
```shell
npm run test
```
Release: submit piex.js.wasm piex.out.wasm to the Chromium repository
```shell
git commit -a -m "Release piexwasm at emscripten <version> ..."
git cl upload
```
Release Builder: emscripten 1.38.33