error won't halt script execution anymore

vueify.js

@@ -67,13 +67,13 @@ function importModule(url) {
  * @param {string} url
  * @param {function(string)} callback
  */
-function getContent(url, callback) {
+function getContent(url, callback, error) {
 	var xhr = new XMLHttpRequest();
 	xhr.onload = function() {
 		if (xhr.status>=200 && xhr.status<300) {
 			callback(xhr.responseText);
 		} else {
-			throw new VueifyJSError(`Failed to load ${url}!`);
+			error(new VueifyJSError(`Failed to load ${url}!`));
 		}
 	};
 	xhr.open('GET', url, true);
@@ -235,7 +235,9 @@ function findSFC(callback) {
 					}
 				}
 
-				let ret = callback(dom, url, name);
+				let ret = callback(dom, url, name).catch((e)=>{
+					console.error(e);
+				});
 				if (ret.__proto__ === Promise.prototype) {
 					promises.push(ret);
 				}
@@ -251,11 +253,12 @@ function findSFC(callback) {
  * @return sfc_src
  */
 function downloadSFC(sfc_url) {
-	// console.log(`download: ${sfc_url}`); // DEBUG
-	return new Promise(resolve => {
-		getContent(sfc_url, (sfc_src) => {
-			resolve(sfc_src);
-		});
+	return new Promise((resolve, reject) => {
+		getContent(
+			sfc_url,
+			(sfc_src) => resolve(sfc_src),
+			(error) => reject(error)
+		);
 	});
 }
 
@@ -305,7 +308,6 @@ async function preprocessCSS(sfc_obj) {
 			// generate scopeId
 			if (!_scopeId) {
 				_scopeId = genScopeId();
-				// console.log("scopeId:", _scopeId); // DEBUG
 			}
 
 			// create temporary iframe to hold & parse css text
@@ -320,7 +322,11 @@ async function preprocessCSS(sfc_obj) {
 			external_txt = await new Promise((resolve, reject) => {
 				if (el.dom.hasAttribute('src')) {
 					let path = el.dom.getAttribute('src');
-					getContent(resolveUrl(path), (content) => resolve(content));
+					getContent(
+						resolveUrl(path),
+						(content) => resolve(content),
+						(error) => reject(error)
+					);
 				} else {
 					resolve('');
 				}
@@ -378,15 +384,18 @@ var cachedSFCs = {}; // { url : {blob_url, sfc_obj} }
  * @return input JS object
  */
 async function preprocessJS(sfc_obj, deps=[]) {
-	// console.log('dependency stack', deps); // DEBUG
 	var js = sfc_obj.js;
 
 	// get content only from last script tag
 	var el = js[js.length-1];
 	var _jsText = await new Promise((resolve, reject) => {
 		if (el.dom.hasAttribute('src')) {
 			let path = el.dom.getAttribute('src');
-			getContent(resolveUrl(path), (content) => resolve(content));
+			getContent(
+				resolveUrl(path),
+				(content) => resolve(content),
+				(error) => reject(error)
+			);
 		} else {
 			resolve('');
 		}
@@ -400,7 +409,6 @@ async function preprocessJS(sfc_obj, deps=[]) {
 	_jsText = await asyncStringReplace(_jsText, re, async(match, path, offset, txt) => {
 
 		let child_sfc_url = resolveUrl(path);
-		// console.log(`found child: ${child_sfc_url}`); // DEBUG
 
 		// check cyclic dependency
 		if (deps.indexOf(child_sfc_url) != -1) {
@@ -416,7 +424,6 @@ async function preprocessJS(sfc_obj, deps=[]) {
 		// replace import statement from relative path to blob url
 		let cache = await Promise.resolve(cachedSFCs[child_sfc_url]);
 		new_str = match.replace(path, cache.blob_url);
-		// console.log(`${match} ====> ${new_str}`); // DEBUG
 		return new_str;
 	});
 
@@ -461,7 +468,6 @@ async function uploadSFC(sfc_code) {
  * @return {string, object}
  */
 async function transpileSFC(sfc_src, deps=[]) {
-	// console.log('transpile:', deps[deps.length-1]); // DEBUG
 	let sfc_obj = await parseSFC(sfc_src);
 	await preprocessCSS(sfc_obj);
 	await preprocessHTML(sfc_obj);
@@ -578,14 +584,12 @@ async function registerRootSFCs(VueClass) {
 
 		return async function() {
 			sfc_url = resolveUrl(sfc_url);
-			// console.log(`found: ${sfc_url}`); // DEBUG
 
 			await importSFC(sfc_url, [sfc_url]);
 			let sfc_obj = await Promise.resolve(cachedSFCs[sfc_url]);
 
 			// register as global components
 			if (!rootSFCs.includes(sfc_obj)) {
-				// console.log(`register: ${sfc_url}`); // DEBUG
 				rootSFCs.push(sfc_obj);
 				new_sfcs.push(sfc_obj);
 				sfc_obj.name = sfc_name;