preserves/implementations/javascript/rollup.config.js

import pkg from './package.json';
import { terser } from 'rollup-plugin-terser';

function distfile(insertion) {
  const f = `${pkg.name}${insertion}.js`;
  return `dist/${f}`;
}

function umd(insertion, extra) {
  return {
    file: distfile(insertion),
    format: 'umd',
    name: 'Preserves',
    ... (extra || {})
  };
}

function es6(insertion, extra) {
  return {
    file: distfile('.es6' + insertion),
    format: 'es',
    ... (extra || {})
  };
}

export default {
  input: 'lib/index.js',
  output: [
    umd(''),
    umd('.min', { plugins: [terser()] }),
    es6(''),
    es6('.min', { plugins: [terser()] }),
  ],
}