775a7c2b41
BREAKING CHANGE: reactive arrays no longer unwraps contained refs
When reactive arrays contain refs, especially a mix of refs and
plain values, Array prototype methods will fail to function
properly - e.g. sort() or reverse() will overwrite the ref's value
instead of moving it (see #737).
Ensuring correct behavior for all possible Array methods while
retaining the ref unwrapping behavior is exceedinly complicated; In
addition, even if Vue handles the built-in methods internally, it
would still break when the user attempts to use a 3rd party utility
functioon (e.g. lodash) on a reactive array containing refs.
After this commit, similar to other collection types like Map and
Set, Arrays will no longer automatically unwrap contained refs.
The usage of mixed refs and plain values in Arrays should be rare in
practice. In cases where this is necessary, the user can create a
computed property that performs the unwrapping.
vue-next 
Status: Alpha.
The current codebase has basic feature parity with v2.x, together with the changes proposed in merged RFCs. There is a simple webpack-based setup with Single-File Component support available here.
Please note that there could still be undocumented behavior inconsistencies with 2.x. When you run into such a case, please make sure to first check if the behavior difference has already been proposed in an existing RFC. If the inconsistency is not part of an RFC, then it's likely unintended, and an issue should be opened (please make sure to use the issue helper when opening new issues).
TODOs as of 3.0.0-alpha.5
- Suspense support in SSR
- SSR Hydration mismatch handling
- SSR vnode directive support
- SSR integration tests
- 2.x compatible async component support
Known Issues
-
There is currently no way to attach custom instance properties via
Vue.prototype. -
The current implementation requires native ES2015+ in the runtime environment and does not support IE11 (yet).
Contribution
See Contributing Guide.