reactjs - 导入自定义 npm 包会导致空/空对象

Question

我可以在同一包中导入 MyComponent 并将其呈现在页面上，但无法链接或下载 MyComponent 包并导入该组件。

package.json:

{
  "name": "my-component",
  "version": "1.0.0",
  "main": "dist/index.js",
  "directories": {},
  "dependencies": {},
  "devDependencies": {
    "babel-loader": "^6.2.3",
    "babel-preset-es2015": "",
    "babel-preset-react": "",
    "css": "^2.2.1",
    "css-loader": "^0.23.1",
    "file-loader": "^0.8.5",
    "node-sass": "^3.4.2",
    "react": "^0.14.7",
    "react-dom": "^0.14.7",
    "sass": "^0.5.0",
    "sass-loader": "^3.1.2",
    "style": "0.0.3",
    "style-loader": "^0.13.0",
    "webpack": "^1.12.13",
    "webpack-dev-server": "^1.14.1"
  }
}

webpack.config.js:

var path = require('path');

module.exports = {
  entry: './src/MyComponent.jsx',
  output: {
    path: './dist/',
    filename: './index.js'
  },
  module: {
    loaders: [{
      test: /\.jsx$/,
      include: path.resolve(__dirname),
      exclude: /node_modules/,
      loader: 'babel-loader',
      query: {
        presets: ['react', 'es2015']
      }
    },
    {
      test: /\.scss$/,
      include: /.scss$/,
      loader: 'style!css!sass'
    },
    {
      test: /\.html$/,
      loader: "file?name=[name].[ext]",
    },]
  }
};

./src/MyComponent.jsx

import React from 'react';

export default class MyComponent extends React.Component {
  constructor(props) {
    super(props);
  }
  render() {
    return (
      <div>Hello World.</div>
    );
  }
}

MyComponent.propTypes = {
  class: React.PropTypes.string
}
MyComponent.defaultProps = {
  class: ''
}

console.log(MyComponent)

使用 webpack 开发服务器，我可以将此组件导入到另一个文件中并将其渲染到页面。

当我在另一个项目中链接和/或安装 webpack 构建的结果时，我希望能够执行相同的操作，如下所示:

new-app.jsx:

import React from 'react'
import ReactDOM from 'react-dom'
import MyComponent from 'my-component'
console.log(MyComponent)
ReactDOM.render(MyComponent, document.body)

当我从“my-component”导入模块时，MyComponent.jsx 中存在的 console.log 语句按预期记录“function MyComponent(props) {...”，但新的 console.log 语句应用程序记录一个空对象。

渲染 new-app.jsx 时的控制台输出:我相信第一个日志是来自 MyComponent.jsx 的日志，第二个日志来 self 的新应用程序。

index.js:19783 MyComponent(props) {
            _classCallCheck(this, MyComponent);

            return _possibleConstructorReturn(this, Object.getPrototypeOf(MyComponent).call(this, props));
          }
index.js:58 Object {}

我的配置中是否缺少任何内容？我是否以错误的方式导出/导入？

Answer 1

解决方案是将其添加到 webpack.config.js 的输出中

library: 'MyComponent',
libraryTarget: 'umd'