This is only boilerplate code for an offline editor for PlayCanvas engine. It's setup with typescript and some decorating for integration with playcanvas.
It also has Visual Studio Code setup for debugging the electron app.
The editor entry point is in editor.ts. It is loaded by preload.ts after the html document has been loaded. That means it has access to node.js.
First you need npm installed. Then in the main project folder, run:
npm install
npm build
Use Visual Studio Code to open the root project, then hit F5 to start the debugging.
Project has electron-builder installed but is not setup yet.