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According ES6 Proxy Polyfill for IE11 there are no pollyfils for proxies in JavaScript; how far would the new reactivity system in VueJS v2.6+ will support IE11?

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V2.x will not use proxies,.

V2.x-next (a parallel "experimental" branch) will and

V3+ will likely make the complete switchable

Details & Source here: https://github.com/vuejs/roadmap

UPDATE

V2.X

No major breaking changes; will be maintained in parallel to 2.x with feature parity

V3.X

Possibility to swap the observer / scheduler with different underlying implementations. E.g. ES5 observer for IE11 compatibility, alternative scheduler to leverage requestIdleCallback for time-slicing.