upgrade angular 4 to angular 9 code example
Example: angular 8 to 9
First, update to the latest version of 8
ng update @angular/cli@8 @angular/core@8
Then, update to 9
ng update @angular/cli @angular/core
First, update to the latest version of 8
ng update @angular/cli@8 @angular/core@8
Then, update to 9
ng update @angular/cli @angular/core