webpack.config.js

const webpack = require('webpack');
const path = require('path');
const env = require('yargs').argv.env;

const libraryName = 'night';

let outputFile, mode, devtool;

if (env === 'build') {
  mode = 'production';
  outputFile = `${libraryName}.min.js`;
  devtool = false;
} else {
  mode = 'development';
  outputFile = `${libraryName}.js`;
  devtool = 'source-map';
}

const config = {
  mode,
  entry: `${__dirname}/src/${libraryName}.js`,
  externals: {
    suncalc: 'suncalc'
  },
  devtool,
  output: {
    path: `${__dirname}/lib`,
    filename: outputFile,
    library: 'Night',
    libraryTarget: 'umd',
    umdNamedDefine: true,
    globalObject: 'global'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader'
        }
      }
    ]
  },
  resolve: {
    modules: [path.resolve('./node_modules'), path.resolve('./src')],
    extensions: ['.json', '.js']
  }
};

module.exports = config;