Migrating an app from 4.x to 5.x requires a few updates to the API properties, CSS utilities, and the installed package dependencies.
This guide assumes that you have already updated your app to the latest version of Ionic 4. Make sure you have followed the Upgrading to Ionic 4 Guide before starting this guide.
API and CSS Updates
For a complete list of breaking changes from 4.x to 5.x, please refer to the breaking changes document in the Ionic core repo.
Packages and Dependencies
For Angular based projects, you can simply run:
npm install @ionic/angular@latest @ionic/angular-toolkit@latest --save
For React projects, you can run:
npm install @ionic/react@latest @ionic/react-router@latest ionicons@latest
For Stencil / vanilla JS projects, you can run:
npm i @ionic/core@latest --save
If you would like a fresh project starter, a new project base can be created from the CLI and an existing app can be migrated over manually.