npm library starter

.babelrc

{
    "presets": [
      [
        "@babel/preset-env",
        {
          "useBuiltIns": false
        }
      ]
    ],
    "plugins": ["@babel/plugin-transform-runtime"]
  }
  

index.js

export const myRadFunction = (...args) => {
    return [...args]
}

package.json

{
  "name": "name-npm-lib-starter",
  "version": "1.3.0",
  "description": "",
  "main": "lib/index.js",
  "files": [
    "/lib"
  ],
  "scripts": {
    "preversion": "npm run build",
    "version": "npm run build",
    "build": "NODE_ENV=production npx webpack",
    "start": "NODE_ENV=development npx webpack --progress --color --watch"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "webpack": "^5.63.0"
  },
  "devDependencies": {
    "@babel/core": "^7.11.6",
    "@babel/plugin-transform-runtime": "^7.11.5",
    "@babel/preset-env": "^7.16.0",
    "babel-loader": "^8.2.3",
    "webpack-cli": "^4.9.1"
  }
}

webpack.config.js

const path = require('path');

module.exports = {
  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /(node_modules)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      }
    ]
  },
  entry: './index.js',
  output: {
    path: path.join(__dirname, 'lib'),
    chunkFilename: '[name].[chunkhash].js',
    filename: '[name].js',
    libraryTarget: 'umd'
  },
  context: __dirname,
  devtool: process.env.NODE_ENV === 'production' ? undefined : 'source-map',
  mode: process.env.NODE_ENV
};

Instructions on exposing an NPM package: https://www.loom.com/share/25ec04ee095f45179ac9b3e5e4224a0d