Solved : How to fix the Angular 9 error "node_modules/@angular/common/common"' has no exported member 'ViewportScroller'"

In this article we review how to fix the Angular 9 error "node_modules/@angular/common/common"' has no exported member 'ViewportScroller'"  using Angular 9 with Ionic   , looking like this :

Fix the Angular 9 error "node_modules/@angular/common/common" has no exported member 'ViewportScroller' using Angular9

The error description appears as : "Module ':/ionicapp/node_modules/@angular/common/common"' has no exported member 'ViewportScroller'." .
This error happens after you installed the missing router in the Ionic app :

npm install @angular/router  --save

What the error is trying to inform us is, that the versions installed do not comply : the router installed is a different version from the one of the Angular version on your app.

We have to open the PACKAGE.JSON file, and check the versions there :

In this case, version of the @angular/core is 5.2.11, while the @angular/router that was installed, is version 9.1.9 . Of course it wouldn't work. It lacks/requires all kind of methods and properties.

Therefore, remove the router and install it according to the current version on your application:

npm install @angular/router@5.2.11  --save

After the installation, check again the PACKAGE.JSON, to see if version matches :

Now it looks OK. Compile and keep enjoying !!

That's All!!! 

Enjoy Angular.....

      by Carmel Schvartzman

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