Basic webpack setup

.babelrc

{
  "presets": [
    "@babel/preset-env"
  ]
}

package.json

{
  "name": "Concept",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "csvtojson": "^2.0.10",
    "webpack": "^5.0.0-beta.7",
    "webpack-cli": "^3.3.10",
    "whatwg-fetch": "^3.0.0"
  },
  "devDependencies": {
    "@babel/core": "^7.7.4",
    "@babel/preset-env": "^7.7.4",
    "babel-loader": "^8.0.6"
  }
}

webpack.config.js

module.exports = {
    entry: ['whatwg-fetch', './index.js'],
    mode: 'development',
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: "babel-loader"
                }
            }
        ]
    },
    output: {
        filename: '../../www/app.js'
    },
    watch: true
};