Javascript Web Workers to process images to base64 data url without canvas using ES2015 Promises

img-to-base64_webworkers.js

let imgs = ['image1.jpg', 'image2.jpg']
let convertedImages = [];

let worker = new Worker('worker.js');
worker.addEventListener('message', function(event) {
	convertedImages = event.data;
})

worker.js

self.addEventListener('message', function(event) {
	processImages(event.data).then(function(data) {
		self.postMessage(data);
	})
})

function processImages(images) {
	function processImage(img) {
		return new Promise(function(resolve, reject) {
			toDataUrl(img, function(dataUrl) {
				resolve(dataUrl)
			})
		})
	}
	let promises = [];
	images.forEach(function(v) {
		promises.push(v)
	})

	return Promise.all(promises);
}

function toDataUrl(src, callback) {
	var xhr = new XMLHttpRequest();
  xhr.responseType = 'blob';
  xhr.onload = onLoadOfImg;
  xhr.onerror = onErrorOfImg;
  xhr.open('GET', src, true);
  xhr.send();

  function onLoadOfImg(rsp) {
  	console.log(rsp.target.status)
  	console.log(rsp);
  	if(rsp.target.status === 200) {
  		var reader = new FileReaderSync();
		 	var blobdata = reader.readAsDataURL(rsp.target.response); 
		 	console.log(blobdata);
		 	callback(blobdata)
	  } else {
	  	callback('');
	  }
  };
  function onErrorOfImg() {
  	callback('');
  };
}

Correction: promises.push(processImage(v))