问流-不能用'Home‘扩展“组件”，因为对象文本[2]与属性状态下的未定义的[3]不兼容

EN

import React, { Component } from "react";
import { Link, withRouter } from "react-router-dom";

import { login } from "../../services/auth";
import api from "../../services/api";
import { getToken } from "../../services/auth";

import type { RouterHistory } from "react-router-dom";

type State = {
    username: number,
    password: string,
    history: RouterHistory,
}

class Home extends Component < State > {
    handleChange = this.handleChange.bind(this);
    handleSignIn = this.handleSignIn.bind(this);

    state = {
        username: '',
        password: '',
        history: '',
    };

...
type Props = {/ * ... * /};
...
class Home extends Component <Props, State>