lib/build/base.json

{
  "config": {
    "appId": "${APP_ID}",
    "productName": "${APP_TITLE}",

    "directories": {
      "app": "${APP_WWW_DIR}",
      "buildResources": "${APP_BUILD_RES_DIR}",
      "output": "${APP_BUILD_DIR}"
    },
    "electronVersion": "7.1.2",

    "electronDownload": {
      "version": "7.1.2"
    }
  }
}