Vue Js Composition API

Composition API: a set of additive, function-based APIs that allow the flexible composition of component logic.

Introduction to VueJS
What's new in Vue3.0
Motivation
Logic Reuse & Code Organization
Better Type Inference
Detailed Design
Code Organization
Logic Extraction and Reuse
Usage Alongside Existing API
Drawbacks
Overhead of Introducing Refs
More Flexibility Requires More Discipline