@timohausmann/quadtree-ts/rollup.config.js

import pkg from './package.json';
import typescript from '@rollup/plugin-typescript';
import { terser } from "rollup-plugin-terser";
import banner2 from 'rollup-plugin-banner2';
import copy from 'rollup-plugin-copy';

export default [
	// browser-friendly UMD build (all)
	{
		input: 'src/index.umd.all.ts',
		output: {
			name: 'Quadtree',
			file: pkg.browser,
			format: 'umd',
            exports: 'default'
		},
		plugins: [
			typescript({ tsconfig: './tsconfig.json' }), // so Rollup can convert TypeScript to JavaScript
            terser(), //minify,
            banner2(() => `/* ${pkg.repository.url} v${pkg.version} */\n`),
		]
	},
	// browser-friendly UMD build (basic)
	{
		input: 'src/index.umd.basic.ts',
		output: {
			name: 'Quadtree',
			file: pkg.browser.replace('.umd.full.', '.umd.basic.'),
			format: 'umd',
            exports: 'default'
		},
		plugins: [
			typescript({ tsconfig: './tsconfig.json' }), // so Rollup can convert TypeScript to JavaScript
            terser(), //minify,
            banner2(() => `/* ${pkg.repository.url} v${pkg.version} */\n`),
            // copy the full version deferred
            copy({
                targets: [
                  { src: pkg.browser, dest: 'docs/examples/assets/' },
                ]
            }),
		]
	},

	// CommonJS (for Node) and ES module (for bundlers) build
	{
		input: 'src/index.esm.ts',
		plugins: [
			typescript({ tsconfig: './tsconfig.json' }), // so Rollup can convert TypeScript to JavaScript
		],
		output: [
			{ file: pkg.main, format: 'cjs', preferConst: true },
			{ file: pkg.module, format: 'es', preferConst: true }
		]
	}
];