Can't serve new TypeScript project: Module not found

I compared the folder structure of the JavaScript and TypeScript projects. Seemed the TypeScript App folder was in the www folder. I took it out to match the Javascript version and it started up but showed a blank screen in browser. There are now a few 404 errors on these files:

http://localhost:8101/build/css/app.ios.css
http://localhost:8101/app/app.html
http://localhost:8101/favicon.ico
http://localhost:8101/build/css/app.ios.css

There was also this error in the terminal:

✗ app/app.ios.scss
Error: File to import not found or unreadable: ../../node_modules/ionic-framework/ionic.ios
Parent style sheet: stdin
on line 19 of stdin
@import "../../node_modules/ionic-framework/ionic.ios";