webpack4获取env变量参数

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#bash

[root@localhost] webpack-cli --env development

#webpack.config.js

module.exports = function (env, args) {
    return {
        mode: env || 'development',
        entry: "./src/app.js",
        output: {
            filename: "app.js",
            path: path.resolve(__dirname, env === 'development' ? 'dist': 'public')
        }
    }
};