React 18: Handling State Updates with useReducer and useContext for Nested Components
I'm dealing with I'm sure I'm missing something obvious here, but I'm working on a React 18 application where I need to manage complex state across multiple nested components, but I'm running into issues with updating state effectively when using `useReducer` in combination with `useContext`. My setup involves a global state managed by a context provider, which is then consumed by deeply nested components. I have defined my reducer and context provider like this: ```javascript import React, { createContext, useReducer, useContext } from 'react'; const initialState = { count: 0, items: [] }; const MyContext = createContext(initialState); const myReducer = (state, action) => { switch (action.type) { case 'increment': return { ...state, count: state.count + 1 }; case 'addItem': return { ...state, items: [...state.items, action.payload] }; default: return state; } }; export const MyProvider = ({ children }) => { const [state, dispatch] = useReducer(myReducer, initialState); return ( <MyContext.Provider value={{ state, dispatch }}> {children} </MyContext.Provider> ); }; export const useMyContext = () => useContext(MyContext); ``` In a child component, I'm trying to increment the count and add an item like this: ```javascript import React from 'react'; import { useMyContext } from './MyContext'; const ChildComponent = () => { const { state, dispatch } = useMyContext(); const handleAddItem = () => { dispatch({ type: 'addItem', payload: 'New Item' }); }; return ( <div> <h1>Count: {state.count}</h1> <button onClick={() => dispatch({ type: 'increment' })}>Increment</button> <button onClick={handleAddItem}>Add Item</button> <ul> {state.items.map((item, index) => (<li key={index}>{item}</li>))} </ul> </div> ); }; ``` The issue I'm encountering is that the child component does not re-render when the state updates, particularly after adding an item. I can see that the state is updating (I can log it to the console), but the UI isn't reflecting those changes. I’ve checked that the context provider wraps the entire component tree correctly, and I’ve confirmed that the `dispatch` function is being called with the right actions. I also tried using `React.memo` on the child component, but that didn’t solve the issue. Any ideas on why the state updates aren't triggering a re-render in the child component? What am I doing wrong? For context: I'm using Javascript on Debian. What would be the recommended way to handle this?