Fix handling of components being on separate lines

Fixes #14

index.js

@@ -82,7 +82,10 @@ const validDescriptorCheck = (value, postfix, descriptor) => {
 export function parseSrcset(string, {strict = false} = {}) {
 	const allDescriptors = strict ? {} : undefined;
 
-	return string.split(imageCandidateRegex)
+	return string
+		.replace(/\r?\n/, '')
+		.replace(/,\s+/, ', ')
+		.split(imageCandidateRegex)
 		.filter((part, index) => index % 2 === 1)
 		.map(part => {
 			const [url, ...descriptors] = part.trim().split(/\s+/);

test.js

@@ -56,6 +56,16 @@ test('parseSrcset() - strict mode', t => {
 	);
 });
 
+test('parseSrcset() - should correctly parse srcset with varied spacing and newlines', t => {
+	const fixture = `image.png,
+					 image@2x.png 2x`;
+
+	t.deepEqual(parseSrcset(fixture), [
+		{url: 'image.png'},
+		{url: 'image@2x.png', density: 2},
+	]);
+});
+
 test('stringifySrcset() should stringify srcset', t => {
 	const fixture = [
 		{url: 'banner-HD.jpeg', density: 2},