add npm script for generate-plugin-definitions-source

package.json

@@ -133,6 +133,9 @@
     "clean:public": "npm run rimraf -- public/js",
     "clean:dll": "npm run rimraf -- dll",
     "clean": "npm cache clean && npm run rimraf -- public/js dll",
+    "generate-plugin-definitions-source": "node bin/generate-plugin-definitions-source.js",
+    "prebuild:dev": "npm run generate-plugin-definitions-source",
+    "prebuild:prod": "npm run generate-plugin-definitions-source",
     "prestart": "npm run build:prod",
     "rimraf": "rimraf",
     "server:watch": "node-dev app.js",