我在Chrome开发者工具上收到此错误：“未捕获的参考：需要未定义”
webpack.config
var path = require('path');
var webpack = require('webpack');
module.exports = {
entry: './src/app.js',
output: {
filename: 'app.js',
path: __dirname + "public/scripts"
},
module: {
loaders: [
{
test: /.jsx?$/,
loader: "babel-loader",
exclude: /node_modules/,
query: {
presets: ["env", "react"]
}
}
]
}
};
的package.json
{
"name": "widget",
"version": "1.0.0",
"description": "",
"main": "app.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "Diogo Matias",
"license": "ISC",
"dependencies": {
"babel-cli": "^6.26.0",
"babel-loader": "^7.1.2",
"babel-preset-env": "^1.6.1",
"babel-preset-react": "^6.24.1",
"npm": "^5.6.0",
"react": "^16.2.0",
"react-dom": "^16.2.0",
"react-google-maps": "^9.4.3",
"react-leaflet": "^1.7.8"
},
"devDependencies": {
"webpack": "^3.10.0"
}
}
这个错误来自我的源javascript文件导入，我有：
import {GoogleMap, Marker} from "react-google-maps";
我使用cdn进行反应和反应。我习惯使用live-server而且我是webpack的新手。我在根目录下运行webpack-dev-server。希望这对你来说足够了。
谢谢。
这是一个可以帮助您入门的最低配置。发出npm run start以在端口9000上显示webpack-dev-server。您的配置中缺少babel-core。
├── build
│ └── index.html
├── package.json
├── src
│ └── app.js
└── webpack.config.js
{
"name": "widget",
"version": "1.0.0",
"description": "Get started with Webpack!",
"scripts": {
"build": "webpack",
"start": "webpack-dev-server"
},
"author": "Diogo Matias",
"license": "ISC",
"dependencies": {
"leaflet": "^1.2.0",
"prop-types": "^15.5.0",
"react": "^16.2.0",
"react-dom": "^16.2.0",
"react-google-maps": "^9.4.3",
"react-leaflet": "^1.7.8"
},
"devDependencies": {
"babel-cli": "^6.26.0",
"babel-core": "^6.26.0",
"babel-loader": "^7.1.2",
"babel-preset-env": "^1.6.1",
"babel-preset-react": "^6.24.1",
"webpack": "^3.10.0",
"webpack-dev-server": "^2.9.7"
}
}
var path = require('path');
var webpack = require('webpack');
module.exports = {
entry: './src/app.js',
output: {
filename: 'bundle.js',
path: path.resolve(__dirname, 'build')
},
devServer: {
contentBase: path.join(__dirname, 'build'),
compress: true,
port: 9000
},
module: {
loaders: [
{
test: /.jsx?$/,
loader: "babel-loader",
exclude: /node_modules/
}
]
}
};
{
"presets": [
["env", {
"targets": {
"browsers": ["last 3 Chrome versions"]
}
}]
]
}
<html lang="en">
<head>
<meta charset="utf-8">
</head>
<body>
<div id="root"></div>
<script src="bundle.js"></script>
</body>
</html>