Reproduction of the problem
If you try to install angular 4 while ng2-charts is installed it will say it has a dependency on @angular/common^2.3.0
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From what I see it works with Angular 4, but the peer dependency is still wrong.
I am working on a project with angular 4 and ng2-charts is working just fine.
This package is now updated for Angular 7. If this issue persists, please provide a codepen/stackblitz/... example showing the issue.
Most helpful comment
I am working on a project with angular 4 and ng2-charts is working just fine.