process.env is always empty event though i am using webpack.defineplugin - node.js

Question

I have tried with adding webpack.defineplugin in my code and I am not able to get data from process.env object i.e object is empty then next I try with adding node:{process:false} in module.export but my project is not able to render app.js file
When I run the npm script and start the local browser I am not able to figure out why process.env is empty all the time
Then I try with adding node:{process:false} so that we can touch global process.env by using webpack.defineplugin but then i am not able to see my react.dom element or Login page , my react code in not getting executed
webpack.config.js file
module.exports = (env) => {
// Get the root path (assuming your webpack config is in the root of your project!)
const currentPath = path.join(__dirname);
console.log(__dirname);
// Create the fallback path (the production .env)
const basePath = currentPath + '/.env';
// We're concatenating the environment name to our filename to specify the correct env file!
const envPath = basePath + '.' + env.ENVIRONMENT;
// Check if the file exists, otherwise fall back to the production .env
const finalPath = fs.existsSync(envPath) ? envPath : basePath;
console.log("final path" + finalPath);
// Set the path parameter in the dotenv config
const fileEnv = dotenv.config({ path: finalPath }).parsed;
const envKeys = Object.keys(fileEnv).reduce((prev, next) => {
prev[`process.env.${next}`] = JSON.stringify(fileEnv[next]);
return prev;
}, {});
console.log("env keys ", envKeys);
return {
node: {
process: true
},
entry: [
// POLYFILL: Set up an ES6-ish environment
// 'babel-polyfill', // The entire babel-polyfill
// Or pick es6 features needed (included into babel-polyfill)
'core-js/fn/promise',
'core-js/es6/object',
'core-js/es6/array',
'./src/index.jsx', // your app's entry point
],
devtool: process.env.WEBPACK_DEVTOOL || 'eval-source-map',
output: {
path: path.join(__dirname, 'public'),
filename: "bundle.js",
publicPath: '/'
},
module: {
rules: loadersConf
},
resolve: {
extensions: ['.js', '.jsx'],
modules: [
path.join(__dirname, "src"),
path.join(__dirname, "node_modules"), // the old 'fallback' option (needed for npm link-ed packages)
],
alias: {
"styles": path.resolve(__dirname, 'styles/'),
}
},
devServer: {
contentBase: "./public",
// do not print bundle build stats
noInfo: true,
// enable HMR
hot: true,
// embed the webpack-dev-server runtime into the bundle
inline: true,
// serve index.html in place of 404 responses to allow HTML5 history
historyApiFallback: true,
port: PORT,
host: HOST,
},
plugins: [
new webpack.DefinePlugin(envKeys),
new webpack.NoEmitOnErrorsPlugin(),
new webpack.NamedModulesPlugin(),
new webpack.HotModuleReplacementPlugin(),
new ExtractTextPlugin({
filename: 'style.css',
allChunks: true
}),
new DashboardPlugin(),
new HtmlWebpackPlugin({
template: './src/index.html',
files: {
css: ['style.css'],
js: ["bundle.js"],
}
}),
]
}
};