rollup.config.js

import babel from '@rollup/plugin-babel';
import { defineConfig } from 'rollup';
import fs from 'fs';

const pkg = JSON.parse(fs.readFileSync('./package.json'));
const version = process.env.SEMANTIC_RELEASE_NEXT_VERSION || pkg.version;

console.log('building version:', version);

const banner = `/**
 * marked v${version} - a markdown parser
 * Copyright (c) 2011-${new Date().getFullYear()}, Christopher Jeffrey. (MIT Licensed)
 * https://github.com/markedjs/marked
 */

/**
 * DO NOT EDIT THIS FILE
 * The code in this file is generated from files in ./src/
 */
`;

export default defineConfig([
  {
    input: 'src/marked.js',
    output: {
      file: 'lib/marked.esm.js',
      format: 'esm',
      banner
    }
  },
  {
    input: 'src/marked.js',
    output: [{
      file: 'lib/marked.umd.js',
      format: 'umd',
      name: 'marked',
      banner
    },
    {
      file: 'lib/marked.cjs',
      format: 'cjs',
      name: 'marked',
      banner
    }],
    plugins: [
      babel({
        presets: [['@babel/preset-env', { loose: true }]]
      })
    ]
  }
]);