使用Typescript的React Router的“ React”未定义

Question

这是我要通过Typescript运行的React Router设置。 它在没有Typescript的情况下有效，但不能与之兼容。 我在浏览器控制台中收到运行时错误。 编译工作正常。 如果我分别包含“ react.js”和“ react-dom.js”，或者包含所有内容的巨型“ bundle.js”，则没有什么区别。 我究竟做错了什么？

错误：

Router.js:91 Uncaught TypeError: Cannot read property 'Component' of undefined
// For context, the line says: React.Component
at Object../node_modules/react-router/es/Router.js (Router.js:91)
at __webpack_require__ (bootstrap:19)
at Object../node_modules/react-router-dom/es/Router.js (Router.js:2)
at __webpack_require__ (bootstrap:19)
at Object../node_modules/react-router-dom/es/BrowserRouter.js (BrowserRouter.js:11)
at __webpack_require__ (bootstrap:19)
at Object../node_modules/react-router-dom/es/index.js (index.js:1)
at __webpack_require__ (bootstrap:19)
at Object../src/index.tsx (index.tsx:3)
at __webpack_require__ (bootstrap:19)

码：

import * as React from "react";
import * as ReactDOM from "react-dom";
import { BrowserRouter as Router, Route, Switch }  from "react-router-dom";

class App extends React.Component {
  render() {
    return (
        <Router>
        <Switch>
        <Route path="/test/" render={() => (
            <div>
                Test.
            </div>
        )} />
        <Route exact={true} path="/" render={() => (
            <div>
                Root page.
            </div>
        )} />
        </Switch>
        </Router>
    );
  }
}

ReactDOM.render(
    <App />,
    document.getElementById("root") as HTMLElement
);

Answer 1

好的。

解决方案是在我的tsconfig.json添加"esModuleInterop": true 。

另外， "allowSyntheticDefaultImports": true允许我import React from "react";编写import React from "react"; 而不是import * as React from "react"; 。

感谢大家。

Answer 2

问题是导入React的方式。 您应该使用以下内容替换所有导入语句：

import React from "react";
import ReactDOM from "react-dom";
import { BrowserRouter as Router, Route, Switch } from "react-router-dom";