Angular 4 - webpack: wait until bundle finished: /

I have similar problem for angular-starter and I was able to remove this bug after:

• upgrade node and npm to lastes versions (still error)
• remove node_modules
• npm cache clean --force
• npm install (still error)
• npm rebuild node-sass --force (still error)
• and this is CRITICAL (surprisingly) : build app by npm run build:aot

After this steps webpack: npm start command start working properly and not hang.