react/no-unsafe-component-will-update

Rule category

Suspicious.

What it does

Warns usage of UNSAFE_componentWillUpdate in class components.

Why is this bad?

Using unsafe lifecycle methods like UNSAFE_componentWillUpdate makes your component's behavior less predictable and are more likely to cause bugs.

Examples

❌ Incorrect

import React from "react";
 
class MyComponent extends React.Component {
  UNSAFE_componentWillUpdate() {
    // ...
  }
}