set mode on webpack.config.js || webpack file configuration
Give mode in webpack.config.js mode: "development || production" //whatever you want to give Use it before Entry module.exports = { mode: "development", entry: './src/main.js', // Bundle all assets from this location together output: { filename: 'index.js', // Output to this file path: path.resolve( __dirname, 'public' ), // In this location },