Is it time to forget about useCallack & memo?

Hey friend,

This is one of the most exciting updates in the React ecosystem: the React Compiler ↗️.

I am incredibly excited because we can now use the Next.js 15 RC ↗️ with this compiler and eliminate many React hooks we've been using, such as useCallback, useMemo, memo, and more.

If you prefer to watch the video instead, then check out my latest video here 👇

How does React Compiler ACTUALLY work?

Our Weekly Snack: Is it time to forget useCallback or useMemo?

First of all, why are we questioning this? Well, that's because React compiler is out.

What is React Compiler?

React Compiler is an automatic optimizer for React code. It analyzes your components and optimizes them for performance, reducing the need for manual memoization with hooks 🪝 like useMemo, useCallback, and memo.

These hooks are currently used to prevent unnecessary re-renders of components based on whether their props or state have truly changed.

React Compiler will optimize your React code provided you follow the Rules of React ↗️.

Now, not using hooks inside a function, function should always return the same output etc. are all part of the rules. These are rules we're aware of.

It can reduce the need for developers to manually add memoization code.

For example, you may not need to add useCallback and useMemo everywhere as React is going to optimize that for you.

Here is an example,

How profiler looks after it optimizes the code

How you can get Next.js 15 React Compiler for a new project:

How can you enable React Compiler?

There are 2 modes:

Opt-in
Compile all Components

🧩 Opt-in mode: React Compiler can be enabled in annotation mode, which allows developers to control which components are optimized. This is seen in the left terminal.

✨ Compile all components: Setting it to true will get all components to get optimized.

Is React Compiler a Silver Bullet?

While React Compiler is a powerful tool, it's essential to remember:

😎 Understanding Performance Optimization: A solid grasp of performance optimization techniques is still valuable. There might be situations where the compiler misses optimizations or requires your input for complex components.
🧪 Experimental Stage: React Compiler is still under development, and its capabilities may evolve over time.

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