rollup.config.js
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
    }
  }
}
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
    }
  }
}
Monkey patching filesaver and html2canvas