no-unsafe-component-will-update

Rule category

Suspicious.

What it does

Warns the 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

Failing

import React from "react";
 
class Example extends React.Component {
  // @warn: Do not use 'UNSAFE_componentWillUpdate'
  UNSAFE_componentWillUpdate() {
    // ...
  }
}