ReferenceError：要求未定义@react

Question

我制作了自己的react 组件npm package 并在npm 中发布，现在在其他CRA 应用程序中导入和使用它时，当npm start 在命令行中运行时出现此错误。

在控制台中：

我的 webpack.config.js 文件：

var webpack = require('webpack');
var path = require('path');
var nodeExternals = require('webpack-node-externals');

module.exports = {
    target: 'web',
    entry: './src/index.js',
    output: {
    path: path.resolve(__dirname, 'build'),
    filename: 'index.js',
    libraryTarget: 'commonjs2'
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                include: path.resolve(__dirname, 'src'),
                exclude: /(node_modules|bower_components|build)/,
                use: {
                loader: 'babel-loader',
                options: {
                    presets: ['env']
                }
                }
            },
            {
                test: /\.css$/i,
                use: ['style-loader', 'css-loader'],
            },
            {
                test: /\.(png|jpg|woff|woff2|eot|ttf|svg)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
                loader: 'url?limit=512&&name=[path][name].[ext]?[hash]'
            }
        ]
    },
    mode: 'development',
    externals: {
        'react': 'commonjs react'
    }
};

我的 package.json 文件：

{
  "name": "primetable1",
  "version": "1.0.0",
  "description": "A Datatable for react apps based on Primereact",
  "main": "build/index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "webpack --watch",
    "build": "webpack"
  },
  "keywords": [
    "primereact",
    "primeicons"
  ],
  "author": "Anish Arya",
  "license": "ISC",
  "peerDependencies": {
    "react": "^16.4.0",
    "react-dom": "^16.4.0"
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.4",
    "babel-plugin-transform-object-rest-spread": "^6.26.0",
    "babel-plugin-transform-react-jsx": "^6.24.1",
    "babel-preset-env": "^1.7.0",
    "babel-runtime": "^6.26.0",
    "css-loader": "^3.4.2",
    "file-loader": "^5.0.2",
    "react": "^16.4.0",
    "react-dom": "^16.4.0",
    "react-hot-loader": "^4.12.19",
    "react-scripts": "3.4.0",
    "style-loader": "^1.1.3",
    "webpack-cli": "^3.3.11",
    "webpack-node-externals": "^1.7.2"
  },
  "dependencies": {
    "classnames": "^2.2.6",
    "primeicons": "^2.0.0",
    "primereact": "^3.4.0",
    "react-transition-group": "^4.3.0"
  }
}

我的 .babelrc 文件：

{
    "presets": ["env"],
    "plugins": [
      "transform-object-rest-spread",
      "transform-react-jsx",
      "react-hot-loader/babel"
    ]
  }

我按照这篇文章来创建和发布 npm 包： https://codeburst.io/extracting-a-react-js-component-and-publishing-it-on-npm-2a49096757f5

如何解决这个错误？

Answer 1

externals 配置似乎错误 - 您可能只需要 externals: [nodeExternals()]（来自 const nodeExternals = require("webpack-node-externals");）。