无法将流类型设置为反应状态

Question

我根据这个答案创建了一个反应组件并设置了流程类型：。但是还是报错：object literal this type is incompatible with object type

我的代码：

class Login extends Component {
  constructor(props) {
    super(props);

    this.state = {
      email: ''
    };
  }

  state: {
    email: String;
  };
}

知道发生了什么吗？

Answer 1

您必须使用 string 而不是 String。 They are not the same.

Remember that string and String are different types.

A string is a literal value like "foo" or the result of an expression like "" + 42.

A String is a wrapper object created by the global String(x) constructor.

这个

state: {
    email: String;
};

应该是

state: {
    email: string;
};

因此您的组件应该如下所示

class Login extends Component {
  state: {
    email: string;
  };

  constructor(props) {
    super(props);

    this.state = {
      email: ''
    };
  }  
}

无法将流类型设置为反应状态

Cannot set flow types to react state

reactjs

flowtype