Never tried it but spontaneously I would say, to create a new project v4 with start, maybe you should also use the upcoming ionic cli?
See readme
👋 👉 Please test ✨ CLI 4 ✨ release candidates: npm i -g ionic@rc ❤️
master (alpha): npm install -g ionic@canary
3.x (stable): npm install -g ionic (recommended)
but like I said, never tried, just a thought