webpack.config.js

const path = require('path');

module.exports = {
    //needed for webpack 4+
    mode:"development",
    //where webpack is pulling files from 
    entry:'./src/main.js',
    //where webpack is outputing normal build
    output:{
        path: path.resolve(__dirname, 'build'), 
				filename: 'bundle.js',
    },
    //loaders and modules that webpack will need to read your specific files
    module:{
        rules: [
            {
                test:/\.jsx?$/, 
                exclude:/node_modules/,
                loader:'babel-loader',
                query:{
                    presets:['es2015','react']
                }
            } ,
            {
                test: /\.css$/,
                use:[
                    {
                        loader:'style-loader'
                    },
                    {
                        loader:'css-loader'
                    } 
                ]
            }
        ]
    }, 
    devServer:{
			publicPath: "/build/",
			hot: true,
			port: 8080
    }
}