本周我正在阅读有关此问题的所有内容，但网络中的任何解决方案都不适用于我正在开发的项目。我正在使用react及其相关技术的webapp工作。为了进行编译过程，我使用的是新版本的webpack（v2.3.2）。我的服务器webpack配置与我的客户端webpack配置分开。一切正常，直到我添加socket.io才能制作一些实时组件。应用Web中的所有解决方案，当我运行捆绑脚本时，我仍会收到以下警告：
WARNING in ./~/express/lib/view.js
80:29-41 Critical dependency: the request of a dependency is an expression
WARNING in ./~/socket.io/lib/index.js
109:11-32 Critical dependency: the request of a dependency is an expression
WARNING in ./~/engine.io/lib/server.js
115:15-37 Critical dependency: the request of a dependency is an expression
当我尝试启动项目时，出现以下错误：
return /*require.resolve*/(!(function webpackMissingModule() { var e = new Error("Cannot find module \".\""); e.code = 'MODULE_NOT_FOUND'; throw e; }()));
^
Error: Cannot find module "."
at webpackMissingModule (/Users/macpro/Documents/lisa_project/pos_lisa/built/server/index.js:357017:76)
at Server.serveClient (/Users/macpro/Documents/lisa_project/pos_lisa/built/server/index.js:357020:25)
at new Server (/Users/macpro/Documents/lisa_project/pos_lisa/built/server/index.js:356959:8)
at Server (/Users/macpro/Documents/lisa_project/pos_lisa/built/server/index.js:356951:41)
at Object.<anonymous> (/Users/macpro/Documents/lisa_project/pos_lisa/built/server/index.js:72569:33)
at __webpack_require__ (/Users/macpro/Documents/lisa_project/pos_lisa/built/server/index.js:20:30)
at Object.<anonymous> (/Users/macpro/Documents/lisa_project/pos_lisa/built/server/index.js:344445:18)
at __webpack_require__ (/Users/macpro/Documents/lisa_project/pos_lisa/built/server/index.js:20:30)
at /Users/macpro/Documents/lisa_project/pos_lisa/built/server/index.js:66:18
at Object.<anonymous> (/Users/macpro/Documents/lisa_project/pos_lisa/built/server/index.js:69:10)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
这是我的 webpack.client.config.js
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const path = require('path');
const webpack = require('webpack');
module.exports = {
entry: ['babel-polyfill', path.join(__dirname, '../source/client.jsx')],
output: {
filename: 'app.js',
path: path.join(__dirname, '../built/statics'),
},
module: {
rules: [
{
test: /\.json$/,
use: 'json-loader',
},
{
test: /\.jsx?$/,
exclude: /(node_modules)/,
loader: 'babel-loader',
query: {
presets: ['es2016', 'es2017', 'react'],
plugins: ['transform-es2015-modules-commonjs'],
},
},
{
test: /\.css$/,
exclude: /(node_modules)/,
loader: ExtractTextPlugin.extract({
fallback: 'style-loader',
use: 'css-loader?modules',
}),
},
{
test: /\.inline.svg$/,
loader: 'babel-loader!react-svg-loader?' + JSON.stringify({
svgo: {
// svgo options
plugins: [{removeTitle: false}],
floatPrecision: 2
}
}),
},
{
test: /\.jpe?g$|\.gif$|\.png$|^(?!.*\.inline\.svg$).*\.svg$/,
loader: 'url-loader?limit=400000'
},
],
noParse: [ path.join(__dirname, '../node_modules/ws') ],
},
externals: [ path.join(__dirname, '../node_modules/ws'), path.join(__dirname, '../node_modules/socket.io') ],
target: 'web',
resolve: {
extensions: ['.js', '.jsx', '.css', '.json'],
},
plugins: [
new webpack.DefinePlugin({
'process.env.BROWSER': true,
}),
new ExtractTextPlugin({
filename: '../statics/styles.css',
ignoreOrder: true,
}),
],
watch: true,
};
这是我的 webpack.server.config.js
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const path = require('path');
const webpack = require('webpack');
module.exports = {
entry: ['babel-polyfill', path.join(__dirname, '../source/server.jsx')],
output: {
filename: 'index.js',
path: path.join(__dirname, '../built/server'),
},
module: {
rules: [
{
test: /\.json$/,
use: 'json-loader',
},
{
test: /\.jsx?$/,
exclude: /(node_modules)/,
loader: 'babel-loader',
query: {
presets: ['latest-minimal', 'react'],
},
},
{
test: /\.css$/,
exclude: /(node_modules)/,
loader: ExtractTextPlugin.extract({
fallback: 'style-loader',
use: 'css-loader?modules',
}),
},
{
test: /\.inline.svg$/,
loaders: [ 'babel-loader',
{
loader: 'react-svg-loader',
query: {
svgo: {
plugins: [{removeTitle: false}],
floatPrecision: 2
}
}
}
]
},
{
test: /\.jpe?g$|\.gif$|\.png$|^(?!.*\.inline\.svg$).*\.svg$/,
loader: 'url-loader?limit=400000'
},
],
noParse: [ path.join(__dirname, '../node_modules/ws') ],
},
externals: [ path.join(__dirname, '../node_modules/ws'), path.join(__dirname, '../node_modules/socket.io') ],
target: 'node',
resolve: {
extensions: ['.js', '.jsx', '.css', '.json'],
},
plugins: [
new webpack.DefinePlugin({
'process.env.BROWSER': false,
}),
new ExtractTextPlugin({
filename: '../statics/styles.css',
ignoreOrder: true,
}),
],
watch: true,
};
我的 server.jsx （重要部分）
import http from 'http';
import express from 'express';
import socketio from 'socket.io';
const lisaApp = express();
const server = http.createServer(lisaApp);
const io = socketio(server);
事先，感谢您的帮助和解答
答案 0 :(得分：1)
好吧，我找到了解决方案，也许它可以帮助其他人。在使用webpack的服务器端配置中，我们必须读取node_modules中的目录列表并给出外部，保持＆＃34; require＆＃34;我们的模块，所以我们必须将以下内容添加到我们的服务器端配置中。 （只有服务器端，客户端webpack工作正常）：
const fs = require('fs');
var nodeModules = {};
fs.readdirSync('node_modules')
.filter(function(x) {
return ['.bin'].indexOf(x) === -1;
})
.forEach(function(mod) {
nodeModules[mod] = 'commonjs ' + mod;
});
此代码必须介于 const webpack 和 module.exports 之间。紧接着＆＃34;模块＆＃34;对象，添加以下行：
externals: nodeModules,
希望这对某人有帮助。