react/no-set-state

If your app keeps all of its state in a store such as Redux or MobX, state inside a component is a second place where data lives, and the store doesn't know about it. This rule reports every call to this.setState in a class component or a createReactClass component.

Configure

Off by default. To turn it on:

[lint.rules]
"react/no-set-state" = "error" # or "warn"

Examples

Reported:

class Counter extends React.Component {
  increment() {
    this.setState({ count: this.state.count + 1 });
  }

  render() {
    return <button onClick={() => this.increment()}>{this.state.count}</button>;
  }
}

Not reported:

class Counter extends React.Component {
  render() {
    return <button onClick={this.props.onIncrement}>{this.props.count}</button>;
  }
}

When not to use it

Local state is a normal part of React. Only turn this rule on if your project has decided to keep all state outside its components. It doesn't look at the useState hook.