[10.0.0-alpha.2] - setState() doesn't apply state when called within componentWillMount

In 10.0.0-alpha.2, state does not set properly from componentWillMount. It seems this has been experienced by others in the past in componentWillReceiveProps. Here’s a simple test case:

export class TestComponent extends Component {
    
    //This does not work:
    componentWillMount() {
        this.setState({message:"componentWillMount"});
    }

    /*
    //This works:
    componentDidMount() {
        this.setState({message:"componentDidMount"});
    }
    */
    
    render() {
        return <p>State came through from {this.state.message || 'nothing =('}</p>;
    }
}

[mochiya98]

probably so. but i… i think there is a better way to solve these problems. maybe we do not need s. let me think about it.

[marvinhagemeister]

We’ll likely keep them around until they are completely removed in react. We still need them for all UNSAFE_* methods in compat which are just aliased to the unprefixed lifecycle methods. They need to be called in the correct order inside the diff and that’s why we don’t gain any size benefits until they are removed completely.