How does Immer integration work in Redux Toolkit?

intermediate

Re-explain

RTK uses Immer under the hood, allowing you to write "mutative" logic that's actually immutable:

Direct mutations: You can modify state directly in reducers
Immer magic: Immer creates a new immutable state tree
Performance: Immer optimizes updates by only changing what's necessary
Type safety: Works seamlessly with TypeScript
You can either mutate the draft state OR return a new state, but not both in the same reducer.

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