我正在创建一个带有 Node/快速后端和 react 前端的网络应用程序。我(我认为)大部分都启动并运行了,但是让浏览器执行热刷新的最后一步没有按预期工作。我将尝试在此处发布所有相关设置。如果您需要其他任何东西来找出我在哪里做错了,请告诉我:
我使用 node ./server/index.js
启动我的应用程序
webpack.config.js var path = require('路径'); var webpack = require('webpack');
let webpackConfig = {
name: 'server',
output: {
path: path.join(__dirname, 'dist'),
filename: 'bundle.js',
publicPath: '/dist/',
},
resolve: {
extensions: [
'', '.js', '.jsx', '.json'
]
},
module: {
loaders: [
{
test: /\.(js|jsx)$/,
loader: 'babel-loader',
exclude: /node_modules/,
query:{
presets: ['es2015', 'react', 'stage-2']
}
},
{
test: /\.json$/,
loader: 'json-loader'
}
]
},
entry: [
'webpack-hot-middleware/client',
'./app/client/client.jsx'
],
plugins: [
new webpack.DefinePlugin({
'process.env': {
NODE_ENV: JSON.stringify('production')
}
}),
new webpack.optimize.OccurenceOrderPlugin(),
new webpack.HotModuleReplacementPlugin(),
new webpack.NoErrorsPlugin()
]
};
export default webpackConfig;
index.js 只包含 'babel-register' 和 'server.js'
服务器/server.js 从 'webpack' 导入 webpack; 从 '../webpack.config' 导入 webpackConfig; 从 'webpack-dev-middleware' 导入 webpackDevMiddleware; 从 'webpack-hot-middleware' 导入 webpackHotMiddleware;
import express from 'express';
const app = express();
const renderPage = () => {
return `
<!doctype html>
<html>
<head>
<title>Brewing Day</title>
<meta charset='utf-8'>
</head>
<body>
<h1>Hello from server.js!!</h1>
<div id='root'></div>
<script src='/dist/bundle.js'></script>
</body>
</html>
`;
};
const compiler = webpack(webpackConfig);
app.use(webpackDevMiddleware(compiler, {
noInfo: true,
publicPath: webpackConfig.output.publicPath })
);
app.use(webpackHotMiddleware(compiler));
app.use((req, res, next) => {
res.status(200).end(renderPage());
});
const server = app.listen(3005, () => {
const host = server.address().address;
const port = server.address().port;
console.log(`Listening at http://${host}:${port}`);
})
export default server;
app/client/client.jsx 是 webpack 配置中的入口点:
import React from 'react';
import ReactDOM from 'react-dom';
import Application from '../components/application.jsx';
window.addEventListener('load', () => {
ReactDOM.render(<Application />, document.getElementById('root')
);
});
在控制台中,当我启动它时,它会列出以下行:
webpack built cc1194a11614a3ba54a3 in 730ms
当我对包含矩形组件的 client.jsx
或 application.jsx
进行更改时,我的控制台中出现了两条新行:
webpack building...
webpack built 8d340a8853d3cfe9478d in 195ms
到目前为止,还不错!
但是,在浏览器中,它不会更新并在控制台中给出以下警告:
[HMR] The following modules couldn't be hot updated: (Full reload needed)
This is usually because the modules which have changed (and their parents) do not know how to hot reload themselves. See http://webpack.github.io/docs/hot-module-replacement-with-webpack.html for more details.
[HMR] - ./app/components/application.jsx
我尝试随机添加 module.hot.accept()
到 application.jsx
。这消除了警告,但如果不按 F5 键并重新加载浏览器,仍然没有更新。
知道我在这里缺少什么吗?我看到另一个例子设置几乎和我的一样,在任何地方都没有任何 module.hot.accept()
调用,但我看不出我的设置与其他设置有什么不同。
我们将不胜感激。
最佳答案
经过大量挖掘,我找到了问题的答案。我正在像这样创建我的基础 React“类”:
class Application = () => {
return (
<div id="maincontent">
<MainMenu />
<ScreenContents />
</div>
)
};
即使 React 支持,HMR 也不支持。
我必须像这样显式地创建我的类:
class Application extends React.Component{
render (){
return (
<div id="maincontent">
<MainMenu />
<ScreenContents />
</div>
);
}
};
然后 HMR 工作得很好 :)
编辑:根据@akoskm 的评论,似乎 webpack 配置文件中的 babel 配置也可能是一个问题。所以这里是相关部分:
babel 设置
var babelSettings = {
presets: ['react', 'es2015', 'stage-2'],
env: {
development: {
plugins: [
['react-transform', {
transforms: [
{
transform: 'react-transform-hmr',
imports: [ 'react' ],
locals: [ 'module' ]
}
]
}]
]
}
}
};
预设和环境的东西对你来说可能不完全一样,但是 react-transform
的东西是这里的重要部分。
加载器
{
test: /\.(js|jsx)$/,
loaders: ['babel?' + JSON.stringify(babelSettings)],
exclude: /node_modules/
}
关于node.js - 让 webpack 热更新在我的同构网络应用程序中正常工作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35301836/