Espruino plugin for Rollup module bundler

It looks like rollup with the commonjs plugin is quite clever. It does tree-shaking out-of-the box. The following outputs are outputs of rollup + commonjs + terser runs inside a browser (1.2MB minified).

Using import:

'main.js:' 
  import { test as printTest } from './lib.js';
  import { run1 as runTest } from './run.js';

  printTest();
  runTest();

'/lib.js:' 
  function test() {
      console.log('test');
  };
  function test1() {
      console.log('test1');
  };
  module.exports = { test, test1 };

'/run.js:' 
  exports.run = function() {
      console.log('run');
  };
  exports.run1 = function() {
      console.log('run1');
  };

'bundle.js:'
(function o(){console.log("test")})(),function(){console.log("run1")}();

Using require (not sure why it adds the dummy module.exports={}) at the end):

'maincjs.js:' 
  const printTest = require('./lib.js').test;
  const runTest = require('./run.js').run1;

  printTest();
  runTest();

'/lib.js:' 
  function test() {
      console.log('test');
  };
  function test1() {
      console.log('test1');
  };
  module.exports = { test, test1 };

'/run.js:' 
  exports.run = function() {
      console.log('run');
  };
  exports.run1 = function() {
      console.log('run1');
  };

'bundle.js:'
(function o(){console.log("test")})(),function(){console.log("run1")}(),module.exports={};