Type error: Argument of type 'StateCreator<...

[RowinVanAmsterdam]

Bug Description

By following the documentation and examples, typescript will throw error below. Found similar issue 2168 and fix #2170 but seems like issue returned?

I tested it on "zustand": "^5.0.2"

Argument of type 'StateCreator<BearState | Partial<BearState>, [], [["zustand/devtools", never]]>' is not assignable to parameter of type 'StateCreator<BearState, [], [["zustand/devtools", never]]>'.
  Type 'StateCreator<BearState | Partial<BearState>, [], [["zustand/devtools", never]]>' is not assignable to type '(setState: { (partial: BearState | Partial<BearState> | ((state: BearState) => BearState | Partial<BearState>), replace?: false | undefined): void; (state: BearState | ((state: BearState) => BearState), replace: true): void; }, getState: () => BearState, store: StoreApi<...>) => BearState'.
    Type 'BearState | Partial<BearState>' is not assignable to type 'BearState'.
      Type 'Partial<BearState>' is not assignable to type 'BearState'.
        Types of property 'bears' are incompatible.
          Type 'number | undefined' is not assignable to type 'number'.
            Type 'undefined' is not assignable to type 'number'.

Code:

import { create } from 'zustand';
import { devtools } from 'zustand/middleware';

interface BearState {
    bears: number;
    increase: (by: number) => void;
}

const useBearStore = create<BearState>()(
    devtools(
        (set) => ({
            bears: 0,
            increase: (by) => set((state) => ({ bears: state.bears + by }))
        }),
        {
            name: 'bear-storage'
        }
    )
);

Reproduction Link

Create new store with example code from docs

[dai-shi]

This works: https://tsplay.dev/NV8AZW

Can you reproduce it in the TS playground?

[dbritto-dev]

@RowinVanAmsterdam all good I don't have any issue

[RowinVanAmsterdam]

@dbritto-dev thanks for checking, you also don't see the error if you rename BearStateNew type?

[dbritto-dev]

@RowinVanAmsterdam yeah, all good

[dbritto-dev]

seems something else on your side

[RowinVanAmsterdam]

seems something else on your side

I think you are right, since it's working on your side. One day later I got an update from vs-code, and now it seems to work. Even after renaming the interface/type. Thanks for helping. I will close the discussion :)