reactjs - Flow (React Native) 使用 'this.state' 时出现错误

Question

每当我尝试在代码中使用 this.state 时，Flow 都会出现以下错误:

object literal: This type is incompatible with undefined. Did you forget to declare type parameter State of identifier Component?:

这是有问题的代码(尽管它也发生在其他地方):

class ExpandingCell extends Component {
    constructor(props) {
    super(props);
    this.state = {
        isExpanded: false
    };
}

任何帮助将不胜感激 =)

Answer 1

您需要为状态属性定义一个类型才能使用它。

class ComponentA extends Component {
    state: {
        isExpanded: Boolean
    };
    constructor(props) {
        super(props);
        this.state = {
            isExpanded: false
        };
    }
}