React: How to Properly Handle Re-renders When Using Context API with Memoized Components
I'm collaborating on a project where I'm updating my dependencies and I need some guidance on I've been researching this but I'm stuck on something that should probably be simple... I'm building a React application using version 17.0.2 and the Context API for state management. I've noticed that when my context value updates, all components that consume this context re-render, even if they don't actually use the updated value. I have a memoized component that should theoretically prevent unnecessary renders, but it doesn't seem to be working as expected. I've tried wrapping my component with `React.memo`, but I'm still seeing performance issues. Here's a simplified version of my code: ```javascript import React, { createContext, useContext, useState, memo } from 'react'; const MyContext = createContext(); const ProviderComponent = ({ children }) => { const [value, setValue] = useState(0); const increment = () => { setValue(prev => prev + 1); }; return ( <MyContext.Provider value={{ value, increment }}> {children} </MyContext.Provider> ); }; const MemoizedComponent = memo(() => { const { value } = useContext(MyContext); console.log('MemoizedComponent rendered'); return <div>Value: {value}</div>; }); const NonMemoizedComponent = () => { const { increment } = useContext(MyContext); return <button onClick={increment}>Increment</button>; }; const App = () => { return ( <ProviderComponent> <MemoizedComponent /> <NonMemoizedComponent /> </ProviderComponent> ); }; export default App; ``` Despite memoizing `MemoizedComponent`, it still renders every time I click the increment button. I expected it to only update the value displayed when the context value changes. I've also tried using the second argument of `memo` to compare previous props, but since I'm only passing context, I'm not sure how to implement that effectively. I'm getting a lot of console logs from the `MemoizedComponent` indicating it's re-rendering unnecessarily, which impacts performance significantly in larger applications. Could anyone provide insight into why this is happening or suggest a different approach to avoid unnecessary re-renders with the Context API? Are there any best practices or configuration tweaks that could help optimize my implementation? Thanks! I appreciate any insights! This is part of a larger web app I'm building. Any feedback is welcome! I'm working with Javascript in a Docker container on Windows 11. Thanks in advance! This is happening in both development and production on macOS. Any advice would be much appreciated.