Versions of @angular/compiler-cli and typescript could not be determined

Question

I have installed Angular/cli and then try to run command ng serve then below error is throwing. I have tried lot of thing like uninstall angular/cli, npm cache clean, etc

Answer 1

I came across this issue when I was installing npm dependencies on Jenkins. I had @angular/compiler-cli in devDependencies and typescript in dependencies and NODE_ENV=production in the environment.

I tried NODE_ENV=development npm install and it worked for me.

For more details see this : https://github.com/angular/angular-cli/issues/8407