Vue.js 2.6: What's New, Release History & Support Lifecycle

What Is New in Vue.js 2.6

Vue 2.6 "Macchiato" delivers a significant syntax upgrade for slots and introduces several key improvements and fixes.

What is the new v-slot syntax?

The new unified v-slot directive replaces the deprecated slot and slot-scope attributes. This provides a clearer and more consistent syntax for working with both default and scoped slots directly in the template.

In practice, this cleans up your template code significantly. Instead of mixing different attributes, you now use the v-slot directive on a <template> tag for all slot interactions.

Before (Deprecated)

<my-component>
  <div slot="header">...</div>
  <div slot-scope="{ data }">{{ data }}</div>
</my-component>

After (New Syntax)

<my-component>
  <template v-slot:header>...</template>
  <template v-slot:default="{ data }">{{ data }}</template>
</my-component>

How are asynchronous errors handled now?

Vue 2.6 introduces the ability to handle errors from asynchronous event handlers. You can now use v-on with a modifier to catch promise rejections from async functions.

This matters because it simplifies error handling for async operations within your component methods. You no longer need to wrap every async call in a try/catch block just to handle UI errors.

<button @click.prevent="asyncMethod" v-on:error.capture="handleError">
  Submit
</button>

What performance improvements were made?

This release includes several under-the-hood optimizations that make your apps faster. The most notable improvements are in scoped slot rendering performance and server-side rendering efficiency.

Scoped slots now have a more efficient rendering mechanism. In our tests, we saw a measurable reduction in render time for complex component trees that make heavy use of scoped slots.

What about dynamic directive arguments?

Vue 2.6 allows you to use dynamic arguments for custom directives. This means you can now bind directive arguments dynamically using square bracket syntax, similar to how dynamic props work.

This opens up new patterns for creating flexible directives. You can now change directive behavior based on component state without having to re-create the directive.

<div v-mydirective:[dynamicArg]="value"></div>