Question

我正在使用React，Redux和Webpack构建一个小型应用程序。当我切换到Webpack v.4时，我开始收到有关捆绑包大小的警告。我了解了缩小尺寸的方法。我还安装了bundle Analyzer，发现节点模块中有很多破折号。通常，每个文件只使用lodash中的一种或两种方法，而我更改了

的所有导入

import _ from 'loadash'

到

import get from 'lodash/get'

但是，这并没有帮助我减小捆的大小。在下面附上我的webpack.config.js。我不知道为什么它不起作用。更令人惊讶的是，我的构建命令是webpack --mode production，并且根据我在webpack 4文档中阅读的内容，它应该启用了一些优化功能out of the box。

webpack.config.js

const LodashModuleReplacementPlugin = require('lodash-webpack-plugin');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

const webpack = require('webpack');

const path = require('path');

module.exports = {
    entry: {
        app: ['babel-polyfill', './src/index.js']
    },
    output: {
        path: path.resolve(__dirname, './dist'),
        filename: 'bundle.js',
    },
    devServer: {
        contentBase: ".",
        headers: {
            "Access-Control-Allow-Origin": "*"
        },
        inline: true,
        historyApiFallback: true,
        port: 8880
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: [
                    {
                        loader: 'babel-loader',
                        options: {
                            presets: ['es2015', 'react'],
                            plugins: ["transform-class-properties"]
                        }
                    },
                    {
                        loader: 'eslint-loader'
                    }
                ]
            },
            {
                test: /\.(png|jpg|gif|jpeg)$/,
                use: [
                    {
                        loader: 'file-loader',
                        options: {}
                    }
                ]
            },
            {
                test: /^.*\.(css|scss)$/,
                use: [
                    'style-loader',
                    'css-loader?importLoaders=1&modules&localIdentName=[path]___[name]__[local]___[hash:base64:5]',
                    {
                        loader: 'postcss-loader',
                        options: {
                            plugins: () => [
                                require('autoprefixer')({
                                    browsers: ['last 1 version']
                                })
                            ]
                        }
                    },
                    'sass-loader'
                ],
            }
        ]
    },
    plugins: [
        new LodashModuleReplacementPlugin(),
        new BundleAnalyzerPlugin()
    ]
};

依赖和开发依赖。

 "dependencies": {
    "babel-runtime": "^6.26.0",
    "classnames": "^2.2.5",
    "clean-webpack-plugin": "^0.1.17",
    "css-loader": "^1.0.0",
    "express": "^4.16.2",
    "file-loader": "^1.1.5",
    "html-webpack-plugin": "^3.2.0",
    "lodash": "^4.17.10",
    "node-sass": "^4.6.0",
    "normalize.css": "^8.0.0",
    "postcss-loader": "^2.0.6",
    "prop-types": "^15.5.10",
    "react": "^16.4.1",
    "react-dom": "^16.4.1",
    "react-icons": "^2.2.5",
    "react-redux": "^5.0.6",
    "react-router": "^4.1.2",
    "react-router-dom": "^4.2.2",
    "react-select": "^1.0.0-rc.10",
    "react-test-renderer": "^16.4.1",
    "react-textfit": "^1.0.1",
    "react-transition-group": "^2.2.1",
    "redux": "^4.0.0",
    "redux-devtools-extension": "^2.13.2",
    "redux-form": "^7.1.0",
    "redux-saga": "^0.16.0",
    "reselect": "^3.0.1",
    "sass-loader": "^7.0.3",
    "style-loader": "^0.21.0",
    "webpack-bundle-analyzer": "^2.13.1"   },   "devDependencies": {
    "autoprefixer": "^9.0.1",
    "axios": "^0.18.0",
    "babel-core": "^6.26.3",
    "babel-eslint": "^8.2.6",
    "babel-jest": "^23.4.0",
    "babel-loader": "^7.1.5",
    "babel-plugin-lodash": "^3.3.4",
    "babel-plugin-transform-class-properties": "^6.24.1",
    "babel-plugin-transform-decorators-legacy": "^1.3.4",
    "babel-plugin-transform-object-rest-spread": "^6.26.0",
    "babel-polyfill": "^6.26.0",
    "babel-preset-env": "^1.7.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-es2017": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "babel-preset-stage-0": "^6.24.1",
    "enzyme": "^3.2.0",
    "enzyme-adapter-react-15": "^1.0.5",
    "enzyme-to-json": "^3.2.2",
    "eslint": "^5.3.0",
    "eslint-loader": "^2.1.0",
    "eslint-plugin-react": "^7.11.1",
    "extract-text-webpack-plugin": "^3.0.0",
    "hoist-non-react-statics": "^3.0.1",
    "identity-obj-proxy": "^3.0.0",
    "isomorphic-fetch": "^2.2.1",
    "jest": "^23.4.1",
    "jquery": "^3.2.1",
    "lodash-webpack-plugin": "^0.11.5",
    "material-design-icons": "^3.0.1",
    "path": "^0.12.7",
    "prettier": "^1.14.2",
    "transform-runtime": "^0.0.0",
    "uglifyjs-webpack-plugin": "^1.3.0",
    "webpack": "^4.16.5",
    "webpack-cli": "^3.1.0",
    "webpack-dev-server": "^3.1.5",
    "webpack-merge": "^4.1.1"   },

Answer 1

是的，默认情况下，生产模式会进行压缩，但似乎您未在配置中定义模式。

要使用生产模式，您必须定义以下模式：

module.exports = {
  ...
  mode: 'production'
  ...
};

OR

您需要在cli中传递参数，例如：

webpack --mode=production

您正在使用=和--mode之间缺少的production。如果未提供，默认模式也将再次变为生产模式。

内置的支持代替了使用插件stats来进行分析，而不是使用插件来进行分析，压缩和其他实用程序。

有关更多详细信息，请参见：

https://webpack.js.org/configuration/optimization/

https://webpack.js.org/configuration/stats/

Answer 2

我建议仅导入所需的零件/功能：

import isEmpty from 'lodash.isempty';

并在package.json中

"dependencies": {
   ...
   "lodash.foreach": "^4.5.0",
   "lodash.includes": "^4.3.0",
   "lodash.isempty": "^4.4.0",

Answer 3

Lodash捆绑包很容易变得比您预期的要大得多，即使导入单个函数也是如此。例如，仅从lodash导入get()会为您的最小化生产套件贡献5K。我创建了一个库，该库进行了一些简化的假设，以提供许多功能的更小实现：micro-dash。 get()的实现仅贡献65个字节。看看它是否适合您。

webpack4 lodash大小太大

3 个答案: