ionic-framework/packages/react/rollup.config.mjs

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

const external = ['react', 'react-dom', 'react-router', 'react-router-dom', 'history', 'tslib'];

export default {
  input: 'src/index.ts',
  output: [
    {
      dir: 'dist/',
      entryFileNames: '[name].js',
      chunkFileNames: '[name]-[hash].js',
      format: 'es',
      sourcemap: true,
    }
  ],
  plugins: [
    typescript(),
  ],
  external: id => external.includes(id) || id.startsWith('@ionic/core') || id.startsWith('ionicons') || id.startsWith('@stencil/react-output-target'),
};