Zustand v5: Smaller Bundle and Improved TypeScript Inference

Zustand v5 is out — the lightweight React state management library continues its philosophy of doing as little as possible, while polishing the TypeScript experience and trimming the bundle further.

Bundle Size

By dropping IE11 / legacy CJS patterns, Zustand v5's core is under 1 KB gzipped. For comparison, Redux Toolkit sits at ~12 KB. In a Zustand app, the state logic lives in your own code — the library itself adds almost nothing.

Improved TypeScript Inference

// v4 — needed explicit generic
const useStore = create<{ count: number; inc: () => void }>()((set) => ({
    count: 0,
    inc: () => set((s) => ({ count: s.count + 1 })),
}));

// v5 — type is inferred automatically
const useStore = create((set) => ({
    count: 0,
    inc: () => set((s) => ({ count: s.count + 1 })),
}));

Removed Deprecations

Several deprecated patterns from v3/v4 have been removed: the default export, the subscribeWithSelector middleware default arguments, and the combine middleware's mutative API.

Migration

npm install zustand@5
npx zustand-migrate  # optional codemod for common patterns