我正在尝试使用express generator和react来设置webpack dev server,使用webpackDevMiddleware和webpackHotMiddleware。虽然我已经让所有东西都正常运作了,但是重新加载的延迟非常大。
每次在浏览器中都会看到这个消息。
我认为Express服务器在获取hot-update.json时出现了延迟或停止。
我已经尝试在bin/www文件中设置超时和keepAliveTimeout。
我希望每当我保存文件时,浏览器能够在不延迟的情况下重新加载已编译的新代码。请保留HTML标记。
每次在浏览器中都会看到这个消息。
'GET http://localhost:8080/__webpack_hmr
net::ERR_INCOMPLETE_CHUNKED_ENCODING 200 (OK)'
但是5到10秒后浏览器将重新加载。在终端中,这些消息正在显示。
GET /7310e23232f92e879547.hot-update.json 404 6.282 ms - 1573
GET / 304 1.071 ms - -
GET /__webpack_hmr 200 1.767 ms - -
GET /stylesheets/style.css 304 1.306 ms - -
GET /app-bundle.js 200 5.337 ms - 2960039
我认为Express服务器在获取hot-update.json时出现了延迟或停止。
我已经尝试在bin/www文件中设置超时和keepAliveTimeout。
server.listen(port, () => {
server.timeout = 0
server.keepAliveTimeout = 0
});
package.json
{
"name": "react-webpack-hmr",
"version": "0.0.0",
"private": true,
"scripts": {
"start": "node ./bin/www",
"dev": "nodemon ./bin/www --inspect --watch app.js --watch webpack.config.js --watch src",
"build": "webpack --config=webpack.config.js",
"clean": "rimraf public/dist"
},
"dependencies": {
"babel-loader": "^8.0.4",
"cookie-parser": "~1.4.3",
"css-loader": "^2.1.0",
"debug": "~2.6.9",
"ejs": "~2.5.7",
"ejs-loader": "^0.3.1",
"express": "~4.16.0",
"extract-loader": "^3.1.0",
"file-loader": "^3.0.1",
"html-loader": "^0.5.5",
"html-webpack-plugin": "^3.2.0",
"http-errors": "~1.6.2",
"morgan": "~1.9.0",
"react": "^16.7.0",
"react-dom": "^16.7.0",
"react-hot-loader": "^4.6.3",
"style-loader": "^0.23.1"
},
"devDependencies": {
"@babel/preset-react": "^7.0.0",
"@babel/runtime": "^7.2.0",
"@babel/generator": "^7.2.2",
"@babel/polyfill": "^7.2.5",
"babel-plugin-async-to-promises": "^1.0.5",
"@babel/core": "^7.2.2",
"@babel/plugin-transform-runtime": "^7.2.0",
"@babel/preset-env": "^7.2.3",
"webpack": "^4.28.3",
"webpack-cli": "^3.1.2",
"webpack-dev-middleware": "^3.4.0",
"webpack-dev-server": "^3.1.14",
"webpack-hot-middleware": "^2.24.3"
}
}
webpack.config.js
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require('webpack');
module.exports = {
entry: {
app: [
'webpack-hot-middleware/client?reload=true',
// 'webpack/hot/only-dev-server',
// 'react-hot-loader/patch',
"@babel/runtime/regenerator",
"./src/app.js"
]
},
mode: 'development',
output: {
filename: "[name]-bundle.js",
path: path.join(__dirname, 'public/dist'),
publicPath: "/"
},
devtool: "cheap-eval-source-map",
devServer: {
contentBase: "dist",
overlay: true,
hot: true
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader'
}
]
},
{
test: /\.html$/,
use: [
{
loader: "html-loader"
}
]
},
]
},
plugins: [
new webpack.HotModuleReplacementPlugin(),
new webpack.NamedModulesPlugin(),
new HtmlWebpackPlugin({
template: './views/index.ejs'
})
]
}
app.js
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
const webpack = require("webpack");
const config = require("./webpack.config");
const compiler = webpack(config);
const webpackDevMiddleware = require('webpack-dev-middleware')(compiler, config.devServer);
const webpackHotMiddleware = require('webpack-hot-middleware')(compiler, config.devServer);
var app = express();
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(webpackDevMiddleware);
app.use(webpackHotMiddleware);
//app.use(express.static(path.join(__dirname, 'public')));
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
app.use('/users', usersRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
next(createError(404));
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;
React端的app.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './components/App.js';
import { AppContainer } from 'react-hot-loader';
function render(Component) {
ReactDOM.render(
<AppContainer>
<Component />
</AppContainer>,
document.getElementById('app')
)
}
render(App);
if (module.hot) {
module.hot.accept('./components/App', () => {
const newApp = require('./components/App').default
render(newApp);
})
}
我希望每当我保存文件时,浏览器能够在不延迟的情况下重新加载已编译的新代码。请保留HTML标记。