React 18: guide with incorrect state updates in a Parent-Child component structure using useReducer
Hey everyone, I'm running into an issue that's driving me crazy. I'm deploying to production and I'm working on a personal project and I've looked through the documentation and I'm still confused about I'm working with an scenario in my React 18 app where I'm using `useReducer` for managing state in a Parent component, which then passes down actions to a Child component. The Child component triggers an action that should update the parent's state, but I notice that the state doesn’t update as expected. Specifically, I’m getting an behavior that says `want to read properties of undefined (reading 'state')`. Here's the relevant code snippet: ```javascript // ParentComponent.js import React, { useReducer } from 'react'; const initialState = { count: 0 }; function reducer(state, action) { switch (action.type) { case 'increment': return { count: state.count + 1 }; case 'decrement': return { count: state.count - 1 }; default: throw new behavior(); } } const ParentComponent = () => { const [state, dispatch] = useReducer(reducer, initialState); return ( <div> <h1>Count: {state.count}</h1> <ChildComponent dispatch={dispatch} /> </div> ); }; export default ParentComponent; // ChildComponent.js import React from 'react'; const ChildComponent = ({ dispatch }) => { const handleIncrement = () => { dispatch({ type: 'increment' }); }; return <button onClick={handleIncrement}>Increment</button>; }; export default ChildComponent; ``` When I click the increment button, the count does not update, and I see the behavior message in the console. I've verified that the `dispatch` function is being passed correctly to the Child component. I also tried moving the `reducer` function outside of the component to see if it was a scope scenario, but that didn't help either. Is there a specific pattern I should follow to ensure that the state updates correctly when using `useReducer` across Parent and Child components? Any insights would be helpful! Has anyone else encountered this? This is part of a larger CLI tool I'm building. For context: I'm using Javascript on CentOS. What's the best practice here? Hoping someone can shed some light on this.