no-unsafe-component-will-mount

Rule category

Suspicious.

What it does

Warns the usage of UNSAFE_componentWillMount in class components.

Why is this bad?

Using unsafe lifecycle methods like UNSAFE_componentWillMount 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_componentWillMount'
  UNSAFE_componentWillMount() {
    // ...
  }
}