Vue.js 3.0: What's New, Release History & EOL Status

What Is New in Vue.js 3.0

Vue 3.0, codenamed "One Piece," is a complete rewrite of the framework focused on making it smaller, faster, and more maintainable. It introduces a new reactivity system and Composition API while maintaining full compatibility with the Options API from Vue 2.

How does the performance compare to Vue 2?

Vue 3 is significantly faster across the board. The team achieved this through a tree-shaking friendly architecture and a compiler-informed Virtual DOM. You get faster component instantiation and updates with roughly half the memory usage of Vue 2.

In practice, the new compiler can skip patching entire branches of the tree if their dynamicness is analyzed at compile time. This matters because your apps feel snappier even as they grow in complexity.

What is the Composition API and why use it?

The Composition API is a new set of APIs for organizing component logic, primarily the setup() function. It lets you group code by logical concern instead of forcing organization by component options like data or methods.

This is a game-changer for building large-scale applications. It makes code more readable and maintainable, especially when sharing and reusing logic across components. You can now extract and import reactive logic cleanly.

What are the major built-in component changes?

Vue 3 introduces two powerful new components. Teleport (formerly Portal) allows you to render a component's content in a different part of the DOM tree. Suspense provides a declarative way to handle async dependencies in a component tree.

These components solve common pain points. Teleport is perfect for modals and popovers, while Suspense simplifies handling loading states for components that fetch data asynchronously.

How has TypeScript support improved?

Vue 3's codebase is now written in TypeScript itself. This provides superior type inference and eliminates the need to maintain separate type declarations. The new architecture is designed with type safety in mind from the ground up.

For developers, this means auto-completion and type checking just work better. You'll spend less time fighting the type system and more time building features with confidence.

What are the key breaking changes to know?

The global API has been restructured to support tree-shaking. APIs like Vue.nextTick() are now named exports. The v-model directive has been reworked, replacing .sync and allowing multiple v-models on a component.

Functional components are now plain functions and the render function API has changed. Event API changes include removing the $on, $off, and $once instance methods. A compatibility build is available to ease migration.