rollup.config.js

 
const resolve = require('@rollup/plugin-node-resolve');
const commonjs =  require('@rollup/plugin-commonjs');
const json = require('@rollup/plugin-json');
const { uglify } =  require('rollup-plugin-uglify');
const fs = require('fs');
const path = require('path');
const packagesDir = path.resolve(__dirname, 'packages');
const packageFiles = fs.readdirSync(packagesDir);
function output(path) {
  return [
    {
      input: [`./packages/${path}/src/index.js`],
      output: [
        {
          file: `./packages/${path}/dist/index.cjs.js`,
          format: 'cjs',
          sourcemap: true
        },
        {
          file: `./packages/${path}/dist/index.esm.js`,
          format: 'esm',
          sourcemap: true
        },
        {
          file: `./packages/${path}/dist/index.js`,
          format: 'umd',
          name: 'Tmonitor',
          sourcemap: true
        },
        {
          file: `./packages/${path}/dist/index.min.js`,
          format: 'umd',
          name: 'Tmonitor',
          sourcemap: true,
          plugins: [uglify()]
        }
      ],
      plugins: [
        resolve(),
        commonjs(),
        json()
      ]
    }
  ];
}

module.exports = [...packageFiles.map(path => output(path)).flat()];