pxt-calliope/clients/electron/package.json

{
  "name"    : "code-the-microbit",
  "version" : "1.0.0",
  "description": "Blocks / Javascript editor",
  "author": "Microsoft",
  "main"    : "main.js",
  "scripts": {
      "start": "node_modules/.bin/electron ."
  },
  "devDependencies": {
      "electron": "*",
      "pxt-microbit": "*"
  }
}