eslint-plugin-react-no-manual-memo

The eslint-plugin-react-no-manual-memo is an essential ESLint plugin designed specifically for codebases that utilize the React Compiler. Its primary function is to flag instances of manual memoization through the use of hooks like useMemo, useCallback, and the React.memo function. This plugin serves as a gentle reminder to leverage the compiler's capabilities for automatic memoization, thereby enhancing both performance and code readability.

Objective

As outlined in the React Compiler documentation, the React Compiler introduces automatic memoization in a more precise and granular way compared to traditional manual methods. Manual memoization can lead to complications if the compiler's inferred memoization does not match, causing the compiler to opt-out of optimizing the component. This scenario not only undermines potential performance but also complicates component readability.

The eslint-plugin-react-no-manual-memo helps developers easily identify and eliminate unnecessary manual memoization patterns from their code. By doing so, it allows for cleaner and more efficient components while enabling manual memoization in exceptional cases where it may provide added value.

Rules Overview

The plugin includes several rules that can be configured to enhance code quality:

Usage

To integrate the plugin into your ESLint configuration:

For Flat Config (ESLint 9+)

Simply use the recommended configuration within defineConfig():

import { defineConfig } from "eslint/config";
import reactNoManualMemo from 'eslint-plugin-react-no-manual-memo';

export default defineConfig([
    reactNoManualMemo.configs['flat/recommended'],
]);

For Legacy Config (.eslintrc)

You can also apply the recommended configuration with:

{
    "extends": ["plugin:react-no-manual-memo/recommended"]
}

This plugin promotes better coding practices in React applications by encouraging developers to rely on the automatic optimizations provided by the React Compiler, ultimately leading to improved performance and maintainability.