rollup.config.js

import json from '@rollup/plugin-json';
import typescript from 'rollup-plugin-typescript2';

const pkg = require('./package.json')
const libraryName = pkg.name

const isProduction = process.env.NODE_ENV === 'production';
console.log('ENV:', process.env.NODE_ENV, libraryName)

const exportGlobals = {
  'react': 'React',
  'react-dom': 'ReactDom',
  'react-reconciler': 'ReactReconciler',
  '@babylonjs/core': 'BabylonjsCore'
}

export default (async () => {
  
  const result = {
    input: `src/${libraryName}.ts`,
    output: [{
      file: pkg.module,
      format: 'es',
      sourcemap: true,
      globals: exportGlobals,
    }],
    context: 'window',
    // external modules not in bundle (i.e.: 'react')
    external: [...Object.keys(pkg.peerDependencies || {})],
    plugins: [
      json(),
      typescript(),
      // minimize production build
      isProduction && (await import('rollup-plugin-terser')).terser()
    ]
  }
  // console.log(`rollup config:\n -> external \n${JSON.stringify(result.external)}\n ->${JSON.stringify(result.output)}`);
  return result;
})