react.js - 用webpack编译react报错?
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问题描述
问 题
用webpack编译react,不知道为什么React会是undefined?
1、webpack.config.js
var webpack = require('webpack');
var path = require('path');
module.exports = {
entry: './src/index.jsx',
output: {
path: __dirname + '/dist',
filename: 'Xzqh.js',
libraryTarget: 'umd',
library: 'Xzqh'
},
externals: {
'react': 'React'
},
module: {
loaders: [
{
test: /\.jsx$/,
loader: 'babel',
exclude: /node_modules/,
query: {
presets: [
'react', 'es2015'
]
}
},
{
test: /\.scss$/,
loader: 'style-loader!css-loader!scss-loader'
}
]
},
devtool: '#inline-source-map',
devServer: {
contentBase: './example',
hot: true,
inline: true,
noInfo: false
},
plugins: [
new webpack.HotModuleReplacementPlugin(),
],
resolve: {
extensions: ["", ".webpack.js", ".web.js", ".js", '.jsx']
}
};
2、./src/index.jsx
import React from 'react';
console.info('React:', React); //这里打印出undefined
export default class Xzqh extends React.Component{
render(){
return (
<p>Hello World</p>
);
}
}
解决方案
或许是文件后缀的问题?改为index.js试试
{
test: /\.js$/,
exclude: /node_modules/,
loader: 'babel',
query: {
presets: ['es2015', 'react']
}
}
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