How to include zone.js, reflect-metadata etc. in Systemjs builder task?
I would try doing an npm install in your app directory for each of the missing packages npm i zone.js npm i reflect-js npm i systemjs npm i esri-system-js
I would try doing an npm install in your app directory for each of the missing packages npm i zone.js npm i reflect-js npm i systemjs npm i esri-system-js