Today, due to the performance issue I am having with my ionic/firebase mobile app, I decided to upgrade from ionic 4 to ionic 5. I was feeling lucky, so I just ran the following command and hoped everything just works.
npm i @ionic/angular@latest –save
Of cause it didn’t just work. When I tried to compile my app, I got the error in the title. I searched around and didn’t find anything. But I suspect it has something to do with my Angular being outdated. So I found this upgrade guide. I ran the following command in sequence and updated Angular. It fixed the issue!
npm install -g @angular/cli
ng update @angular/cli@8 @angular/core@8 --allow-dirty
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