rollup.config.js

import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import babel from 'rollup-plugin-babel';
import { terser } from "rollup-plugin-terser";

module.exports = {
  input: 'src/FreeDraw.js',
  output: [
    {
      file: 'dist/leaflet-freedraw.cjs.js',
      format: 'cjs',
      exports: 'named',
      sourcemap: true,
      external: ['ramda', 'leaflet', 'clipper-lib'],
    },
    {
      file: 'dist/leaflet-freedraw.esm.js',
      format: 'esm',
      sourcemap: true,
      exports: 'named',
      external: ['ramda', 'leaflet'],
    },
    {
      file: 'dist/leaflet-freedraw.web.js',
      format: 'cjs',
      sourcemap: true,
      exports: 'named',
      external: ['ramda', 'leaflet'],
    },
    {
      file: 'dist/leaflet-freedraw.iife.js',
      format: 'iife',
      sourcemap: true,
      name: 'LeafletFreeDraw',
      exports: 'named',
      external: ['ramda', 'leaflet'],
    }
  ],
  plugins: [ 
    resolve(),
    commonjs({
      namedExports: {
        'node_modules/leaflet/dist/leaflet-src.js': [ 'DomUtil', 'Point', 'DivIcon', 'Marker', 'DomEvent', 'Polygon', 'LineUtil', 'FeatureGroup' ],
        'node_modules/clipper-lib/clipper.js': ['Clipper', 'PolyFillType'],
        'node_modules/ramda/dist/ramda.js': ['flatten', 'compose', 'head', 'complement', 'identical']
      }
    }),
    babel({
      exclude: 'node_modules/**'
    }),
    terser()
  ]
};