Last checked and updated on April 15, 2026What Is New in Vue.js 1.0
| Category | Key Changes |
|---|---|
| New Features | v-else directive, v-for range, inline templates, component events API |
| Improvements | Performance optimizations, better error handling, template parser rewrite |
| Breaking Changes | v-model behavior, array observation, prop binding syntax |
| Deprecated | v-with, v-ref, v-el, v-attributes, v-style, v-class |
| Bug Fixes | Over 100 issues resolved including transition and SSR fixes |
What are the major new directives and template features?
Vue 1.0 introduces the v-else directive for conditional rendering alongside v-if. You can now use v-for with integer ranges like v-for="n in 10" for simpler iteration. Inline templates via the inline-template attribute provide more flexibility for component content distribution.
The new component events API ($dispatch, $broadcast, $emit) offers a cleaner way to handle communication between components. This replaces some of the older patterns that were more limited in scope.
How did performance get better in this release?
Significant performance optimizations were made across the board. The template parser was completely rewritten to be more efficient, and overall rendering speed saw noticeable improvements. Memory usage was also reduced through better internal management.
In practice, these changes mean your applications will feel snappier, especially when dealing with large lists or complex component trees. The optimizations are particularly noticeable on mobile devices with limited resources.
What breaking changes should I watch out for?
The behavior of v-model changed to use $value instead of value for form input components. Array observation was overhauled - you now need to use array methods like push or pop instead of direct assignment to trigger updates.
Prop binding syntax changed from prop="{{value}}" to :prop="value" or prop="{{value}}" for literal values. These changes make the API more consistent but require updates to existing code.
Which features were deprecated and removed?
Several directives were deprecated: v-with, v-ref, v-el, v-attributes, v-style, and v-class. These were replaced with more standardized approaches using props and attributes.
The Vue.config options were simplified, removing some of the less commonly used configuration settings. This cleanup helps reduce the API surface area while maintaining all essential functionality.
How did error handling and debugging improve?
Error messages became much more descriptive and helpful for debugging. The system now provides better stack traces and context when something goes wrong during rendering or component initialization.
You'll find it easier to track down issues with template compilation and data binding. The improved error handling is one of those quality-of-life improvements that saves developers hours of frustration.
FAQ
How do I migrate my existing Vue 0.12 applications to 1.0?
Start by replacing deprecated directives like v-with and v-ref with their alternatives. Update your v-model usage for custom components and ensure array mutations use the proper methods. The migration guide in the documentation covers all the necessary steps.
What's the new recommended way to handle component communication?
Use the events API with $emit for child-to-parent communication and $dispatch/$broadcast for cross-component messaging. This provides a more structured approach compared to the previous event system.
Does v-for work differently with arrays in Vue 1.0?
Yes, you can no longer directly set array indices to trigger reactivity. You must use array methods like push, pop, splice, or the $set method for individual items to ensure changes are properly detected.
Are there any changes to how filters work?
Filters now have a simpler syntax and work more consistently across different contexts. The changes make them easier to use in both mustache tags and v-bind expressions without unexpected behavior.
What happened to the v-style and v-class directives?
These were deprecated in favor of using standard class and style bindings. Instead of v-class, you should now use :class with object or array syntax, which provides the same functionality with better performance.