vuejs/composition-api
Vue 2 plugin for Composition API npm install @vue/composition-api yarn add @vue/composition-api You must install @vue/composition-api as a plugin via Vue.use() before you can use the Composition API to compose your component. 💡 When you migrate to Vue 3, just replacing @vue/composition-api to vue and your code should just work.
https://github.com/vuejs/composition-api