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我想看看我从使用所有东西的非开发版本中获得了多少速度提升，所以我使用我的“生产”webconfig 构建了我的网站。但开发工具仍然告诉我它处于“开发”模式

This page is using the development build of React. 

const merge = require("webpack-merge");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
var BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const common = require("./webpack.common.js");

module.exports = merge(common, {
  // Provides process.env.NODE_ENV with value production.
  // Enables FlagDependencyUsagePlugin, FlagIncludedChunksPlugin,
  // ModuleConcatenationPlugin, NoEmitOnErrorsPlugin, OccurrenceOrderPlugin,
  // SideEffectsFlagPlugin and UglifyJsPlugin.
  mode: "production",
  // see https://webpack.js.org/configuration/optimization/
  optimization: {
    // minimize default is true
    minimizer: [
      // Optimize/minimize CSS assets.
      // Solves extract-text-webpack-plugin CSS duplication problem
      // By default it uses cssnano but a custom CSS processor can be specified
      new OptimizeCSSAssetsPlugin({})
    ]
  },
  module: {
    rules: [
      {
        test: /\.(sa|sc|c)ss$/,
        // only use MiniCssExtractPlugin in production and without style-loader
        use: [MiniCssExtractPlugin.loader, "css-loader", "sass-loader"]
      }
    ]
  },
  plugins: [
    // Mini CSS Extract plugin extracts CSS into separate files.
    // It creates a CSS file per JS file which contains CSS.
    // It supports On-Demand-Loading of CSS and SourceMaps.
    // It requires webpack 4 to work.
    new MiniCssExtractPlugin({
      filename: "[name].css",
      chunkFilename: "[id].css"
    }),
    new BundleAnalyzerPlugin()
  ]
});

在我的 package.json

  "scripts": {
    "dev": "cross-env NODE_ENV=dev webpack-serve --config webpack.dev.js --open",
    "prod": "cross-env NODE_ENV=prod  webpack -p --config webpack.prod.js",
    "qa": "cross-env NODE_ENV=QA webpack --config webpack.prod.js"
  },
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1 回答 1

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我越来越相信您的问题源于您的 package.jsonNODE_ENV中的设置prod。我认为您应该将其设置为production，或者允许使用webpack 配置中webpack的选项在内部进行设置。mode

react-scripts 包明确将此值设置为用于production在 github 项目中的 facebook/react 项目中构建和搜索，将NODE_ENV大量检查显示production为值而不是prod.

这是 react-is 的index.js文件，react 源中的许多其他项目都遵循相同的模式：

'use strict';

if (process.env.NODE_ENV === 'production') {
  module.exports = require('./cjs/react-is.production.min.js');
} else {
  module.exports = require('./cjs/react-is.development.js');
}

我会尝试将您的构建脚本更改为：

"prod": "cross-env NODE_ENV=production webpack -p --config webpack.prod.js",

甚至让它webpack -p自动设置：

"prod": "cross-env webpack -p --config webpack.prod.js",
于 2019-05-17T01:09:18.627 回答