console.log(process.env.ASPNETCORE_ENVIRONMENT); // undefined and defined ASPNETCORE_ENVIRONMENT as Development in Windows Environment. Be careful with the above solutions since NODE_ENV can be undefined and will throw running .trim() on undefined. webpack process env node_env undefinedwhat happened to chingy. It allows you to specify the base path for all the assets within your application. EnvironmentPlugin 可以接收键数组或将键映射到其默认值的对象。 （译者注：键是指要设定的环境变量名） new webpack. "process" variable is node built-in it doesn't exist in browser, so webpack needs to replace it during build. 在你的 webpack 配置中，有两个选项会影响process.env：. webpack plugins: [ new webpack. The publicPath configuration option can be quite useful in a variety of scenarios. Webpack does set process.env.NODE_ENV in the define plugin. process.env. 変換後のprocess.env.NODE_ENVが書き変わっているのはおそらくwebpackが勝手にやってるから。 なので、それ以外のprocess.envは、手動で指定しなければいけなかった。 そして辿り着いたのがここ。 参考サイト：webpackで環境変数をモジュールに渡す - Qiita 用法. I have the webpack.config below. Environment variables will be made accessible in your … Я использую webpack 2 и ven выполняю тот webpack-dev-server, который я получаю в своем браузере Вываливается исключение: Uncaught ReferenceError: webpackJsonp is not … The process.env property returns an object containing the user environment. // Wrong: REACT_APP_KEY="AHEHEHR" // Right: REACT_APP_KEY=AHEHEHR. React + webpack: 'process.env' is undefined Cross-env 사용 이유. process.env包含着关于系统环境的信息。. 默认情况下，Webpack 会为 web 打包。这意味着它将替换所有 process.env.使用您在 DefinePlugin 中定义的语句。你从来没有设置PORT任何东西，所以它将是未定义的。 你有两个选择，要么定义 PORT在 DefinePlugin 中，或将 webpack 目标更改为 node并删除 DefinePlugin。这将使 webpack 在运行时使用实际的环境变量。 webpack Technically, NODE_ENV is a system environment variable that Node.js exposes into running scripts. It is used by convention to determine dev-vs-prod behavior by server tools, build scripts, and client-side libraries. Contrary to expectations, process.env.NODE_ENV is not set to 'production' within the build script webpack.config.js, see #2537. 比如，process.env.HOME返回用户的主目录。. Webpack stringify (process. NODE_ENV是使用者一個自定義的變數，在webpack中它的用途是判斷生產環境或開發環境的依據的。. React + webpack: 'process.env' is undefined Reactjs I'm trying to run the hot dev server on our site with webpack; the site uses ReactJS, which has this code in it: Using environment variables with Webpack - prateeksurana.me