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February 22, 2024 04:14
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| import React, { createContext, useCallback, useContext, useMemo, useRef, useSyncExternalStore } from "react"; | |
| type MakeStoreProps<T> = { | |
| name: string | |
| initial: T | |
| } | |
| type Subscriber = () => void | |
| type SubscriberStore<T> = { | |
| get() : T | |
| set(setter: (prev: T) => T) : void | |
| subscribe(callback: Subscriber): () => void | |
| } | |
| type SetRegister<T, > = (setter: (value: T) => T) => void | |
| export const makeContextSyncExternalStore = <V,>(param: MakeStoreProps<V>) => { | |
| const initValue = param.initial | |
| const StoreContext = createContext<SubscriberStore<V> | null>(null) | |
| const Provider = <P,>({children, ...props}: React.PropsWithChildren<P>) => { | |
| const storeValue = useRef<V>(initValue); | |
| const subscribers = useRef(new Set<Subscriber>()); | |
| const store: SubscriberStore<V> = useMemo( | |
| () => ({ | |
| get: () => storeValue.current, | |
| set: (setFn) => { | |
| storeValue.current = setFn(storeValue.current); | |
| subscribers.current.forEach((callback) => callback()); | |
| }, | |
| subscribe: (callback) => { | |
| subscribers.current.add(callback); | |
| return () => { | |
| subscribers.current.delete(callback); | |
| }; | |
| }, | |
| }), | |
| [] | |
| ); | |
| return ( | |
| <StoreContext.Provider value={store}> | |
| {children} | |
| </StoreContext.Provider> | |
| ) | |
| } | |
| StoreContext.displayName = `${param.name}Context`; | |
| Provider.displayName = `${param.name}Provider`; | |
| const useStore = <R, >(selector: (v: V) => R): [getter: R, setRegister: SetRegister<V>] => { | |
| const store = useContext(StoreContext); | |
| if (!store) { | |
| throw Error(`${StoreContext.displayName} Context를 찾을 수 없습니다.`); | |
| } | |
| const state = useSyncExternalStore(store.subscribe, () => selector(store.get()), () => selector(store.get())); | |
| return [state, store.set] as const; | |
| } | |
| return [ | |
| Provider, | |
| useStore, | |
| ] as const | |
| } | |
| const [Provider1, useStore1] = makeContextSyncExternalStore({ | |
| name: "test", | |
| initial: 0 | |
| }) | |
| const [Provider2, useStore2] = makeContextSyncExternalStore<number | null>({ | |
| name: "test", | |
| initial: null | |
| }) | |
| export default makeContextSyncExternalStore |
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