ReactJS .default不是一个构造函数

Question

我对React和Mobx都很陌生，所以我尝试做一个小应用程序。当我尝试运行它时，出现错误：Uncaught TypeError: _releasesState2.default is not a constructor。由于我不知道问题出在哪里，我快要绝望了。这是我目前的代码：

我的index.js：

import React from "react";
import ReactDOM from "react-dom";

import Releases from "./components/releases";

class App extends React.Component {
  constructor() {
    super();
  } 
  render() {
    return (
        <div>
           <Releases />
        </div>
     )
  }
}

ReactDOM.render(<App/>, window.document.getElementById("app"));

releases.js文件：

import React from "react";
import { observer } from "mobx-react";

import ReleaseState from "./releases-state";

@observer
export default class Releases extends React.Component {
   constructor() {
     super();

    this.state = new ReleaseState();
   }
   render() {
     return (
        <div>
            // content here
        </div>
      ) 
   }
}

以及 releases-state.js 文件：

import { observable } from "mobx"

class ReleaseState {
   @observable releases = [];

   constructor() {
      let data = [] // some array with data
   }
}

const releaseState = new ReleaseState();

有人可以告诉我这里出了什么问题吗？

- ST80

Answer 1

你在 release-state.js 中没有导出 ReleaseState 类。尝试修改你的代码如下：

export default class ReleaseState {
  ...

- Tamas Hegedus

Answer 2

看起来你可能忘记导出ReleaseState了？

export default releaseState;

- Austin Greco