All declarations of 'WeakMap' must have identical type parameters

Question

I'm building Ionic App and everything is going fine, but when I cloned my source code to another machine, I get an error as shown in the image.

although the app is compiling without errors at the first machine I checked Ionic, npm, typescript and node versions and they are identical for the two machines.

what I'm missing here!?

Answer 1

Just to document this in case anyone has the same issue I was able to fix this by deleting global node_module folder in path

C:\Users\{user_name}\AppData\Roaming\npm\node_modules

and in my case, there was another folder at C:\node_modules as indicated at the very end of the error message