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state middleware for Zustand","homepage":"https://github.com/cmlarsen/zustand-middleware-computed-state","keywords":["react","state","manager","management","redux","store","zustand","computed","derived","selector","middleware"],"repository":{"type":"git","url":"git+https://github.com/cmlarsen/zustand-middleware-computed-state.git"},"author":{"name":"Caleb Larsen"},"bugs":{"url":"https://github.com/cmlarsen/zustand-middleware-computed-state/issues"},"license":"MIT","readme":"# Zustand Computed State Middleware\n\nThis is a dead simple middleware for adding computed state to state management library [Zustand](https://github.com/pmndrs/zustand).\n\n```\nnpm install zustand-middleware-computed-state\n-- or --\nyarn add zustand-middleware-computed-state\n```\n\nThe computed values are defined as a function passed as the second argument passed into the `computed(store, computedStore)` middleware. The resulting values will be merged into the store and accessible just like any other bit of Zustand state.\n\nSince this computed state is updated on every state change, these should be kept light.\n\n```javascript\nimport create from 'zustand'\nimport { computed } from 'zustand-middleware-computed-state'\n\nconst useState = create(computed(store, computedStore))\n```\n\n## Example\n\n```javascript\nimport create from 'zustand'\nimport { computed } from 'zustand-middleware-computed-state'\n\nconst useStore = create(\n computed(\n (set) => ({\n count: 0,\n inc: () => set((state) => ({ count: state.count + 1 })),\n }),\n (state) => {\n function isEnough() {\n if (state.count > 100) {\n return 'Is enough'\n } else {\n return 'Is not enough'\n }\n }\n\n return {\n computedCount: state.count + 10,\n isEnough: isEnough(),\n }\n }\n )\n)\n\nfunction Counter() {\n const { count, computedCount, isEnough, inc } = useStore()\n\n return (\n