rollup.config.js

const rollupResolve = require('rollup-plugin-node-resolve');
const rollupBabel = require('rollup-plugin-babel');


// Monkey patching filesaver and html2canvas
function monkeyPatch() {
  return {
    transform: (code, id) => {
      var file = id.split('/').pop()

      // Only one define call per module is allowed by requirejs so
      // we have to remove calls that other libraries make
      if (file === 'FileSaver.js') {
        code = code.replace(/define !== null\) && \(define.amd != null/g, '0')
      } else if (file === 'html2canvas.js') {
        code = code.replace(/&&\s+define.amd/g, '&& define.amd && false')
      }

      return code
    }
  }
}

// Rollup removes local variables unless used within a module.
// This plugin makes sure specified local variables are preserved
// and kept local. This plugin wouldn't be necessary if es2015
// modules would be used.
function rawjs(opts) {
  opts = opts || {}
  return {
    transform: (code, id) => {
      var variable = opts[id.split('/').pop()]
      if (!variable) return code

      var keepStr = '/*rollup-keeper-start*/window.tmp=' + variable +
        ';/*rollup-keeper-end*/'
      return code + keepStr
    },
    transformBundle: (code) => {
      for (var file in opts) {
        var r = new RegExp(opts[file] + '\\$\\d+', 'g')
        code = code.replace(r, opts[file])
      }
      var re = /\/\*rollup-keeper-start\*\/.*\/\*rollup-keeper-end\*\//g
      return code.replace(re, '')
    }
  }
}

module.exports = {
	input: './main.js',
	plugins: [
		rollupResolve(),
		monkeyPatch(),
		rawjs({
		'jspdf.js': 'jsPDF',
		'filesaver.tmp.js': 'saveAs',
		'deflate.js': 'Deflater',
		'zlib.js': 'FlateStream',
		'BMPDecoder.js': 'BmpDecoder',
		'omggif.js': 'GifReader',
		'JPEGEncoder.js': 'JPEGEncoder',
		'html2pdf.js': 'html2pdf'
		}),
		rollupBabel()
	],
	output: [
		{
			name: 'namebndl',
			format: 'iife',
			file: './lib/index.js',
			sourcemap: false
		}
	],
}