Vue2 uses Vue3’s combined @vue/composition-api, vuex-composition-helpers such as setup, ref, reactive, etc.

Some students want to experience Vue3’s combined API, setup, ref, reactive, etc. in the current project, and they can upgrade to Vue3 in one step. However, Vue is indeed version 2.x. What should I do if the current version is not changed?

Vue2.7.0 has its own composition-api that you can experience with confidence. It does not support