immer

Introduced current, which takes a snapshot of the current state of a draft and finalizes it (but without freezing). Current is a great utility to print the current state during debugging (no Proxies in the way), and the output of current can also be safely leaked outside the producer. Implements #441, #591

Getters and setters are now handled consistently: own getters and setters will always by copied into fields (like Object.assign does), inherited getters and setters will be left as-is. This should allow using Immer directly on objects that trap their fields, like done in Vue or MobX. Fixes #584, #439, #593, #558

Produce no longer accepts non-draftable objects as first argument

Original can only be called on drafts and will throw otherwise (fixes #605)

non-enumerable and symbolic fields will never be frozen

The patches for arrays are now computed differently to fix some scenarios in which they were incorrect. In some cases they will be more optimal now, in other cases less. Especially splicing / unshifting items into an existing array might result in a lot of patches. Fixes #468

Improved documentation in several areas, there is now a page for typical update patterns and a separate page on how to work with classes. And additional performance tips have been included. Fixes #457, #115, #462

Fixed #462: All branches of the produced state should be frozen

Fixed #588: Inconsistent behavior with nested produce

Fixed #577: Immer might not work with polyfilled symbols

Fixed #514, #609: Explicitly calling useProxies(false) shouldn’t check for the presence of Proxy.