Reactjs 导入自定义npm包将导致空/空对象

Reactjs 导入自定义npm包将导致空/空对象,reactjs,npm,ecmascript-6,webpack,Reactjs,Npm,Ecmascript 6,Webpack,我可以在同一个包中导入MyComponent并将其呈现在页面上,但我无法链接或下载MyComponent包并导入组件 package.json: { "name": "my-component", "version": "1.0.0", "main": "dist/index.js", "directories": {}, "dependencies": {}, "devDependencies": { "babel-loader": "^6.2.3",

我可以在同一个包中导入MyComponent并将其呈现在页面上,但我无法链接或下载MyComponent包并导入组件

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)
当我从“my component”导入模块时,MyComponent.jsx中的console.log语句会按预期记录“function MyComponent(props){…”,但新应用程序中的console.log语句会记录一个空对象

呈现new-app.jsx时的控制台输出:我相信第一个日志来自MyComponent.jsx,第二个日志来自我的新应用程序

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?

解决方案是将其添加到webpack.config.js的输出中

library: 'MyComponent',
libraryTarget: 'umd'

我也有类似的问题

import {MySingleton} from "../../../dist/my-bundle-webpack-package";

MySingleton.instance.foo();
错误:

Cannot read property 'instance' of undefined
我的包文件的index.ts是:

export class MySingleton{
   ...
}
module.exports = MySingleton;
问题的解决方案是删除
模块。导出

export class MySingleton{
   ...
}

添加
libraryTarget:“umd”
在这里没有帮助

我在尝试通过
npm链接将npm包作为lib使用时遇到了一些问题。我的问题在于两个项目上的重复依赖关系-Project和lib导入了相同的模块。Webpack在这里无声地失败。

通过将
“externals”
添加到Lib中的我的webpack配置中来修复它,以告知这些包将存在于项目中

externals: {
    "pixi.js": "pixi.js",
    immer: "immer",
    redux: "redux",
    lodash: "lodash",
    gsap: "gsap",
  },

我有点困惑..你的node_modules文件夹中有一个名为
my component
的包吗?是的,在我的新应用程序中,有一个文件夹./node_modules/my component包含源代码和工件。这可以通过npm链接它们,或者通过发布到npm并进行npm安装来实现。好的,也许可以看看他们在这里做的方式:,你们可能很久以前就需要在你们的网页配置中使用这个库,但我自己刚刚遇到这个问题。这些行实际上是做什么的?
externals: {
    "pixi.js": "pixi.js",
    immer: "immer",
    redux: "redux",
    lodash: "lodash",
    gsap: "gsap",
  },