In order to upgrade your Vue 2 project to Vue 3, you will have to split the upgrade into different parts. We have the upgrade of the framework itself, and then we have the ecosystem components, such as vue-router and vuex, and finally, the bundler that joins everything in the end.
The framework upgrade comes with break changes. There are some break changes that are presented in this book in the What is new in Vue 3 section of this chapter, and others that may occur in a more advanced API schema. You have to manually update and check whether your components are valid for the upgrade on the framework.
