React Dev Tools認為我的網站處於開發模式

Question

我想看看使用所有內容的非開發版所帶來的速度提升，因此我使用“生產” webconfig構建了網站。 但是開發工具仍然告訴我它處於“開發”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中

  "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"
  },

Answer 1

我的信心正在增長，您的問題源於將package.json中的NODE_ENV設置為prod 。 我認為您應該改為將其設置為production ，或者允許webpack使用webpack配置中的mode選項在內部進行設置。

react-scripts軟件包顯式地將此值設置為production以構建並在github項目中的facebook / react項目中搜索NODE_ENV顯示大量 production檢查作為該值而不是prod 。

這是react-is的index.js文件，react源中的許多其他項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');
}

我會嘗試將您的構建腳本更改為：

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

甚至讓webpack -p自動設置它：

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