[fix] Small typo

libview/src/view-def.ts

@@ -211,7 +211,7 @@ function loadDescriptors(
         finished += 1;
         if (finished >= target) resolve(descriptors);
       }
-      sources.map((source: ViewRegistrySource) => {
+      sources.forEach((source: ViewRegistrySource) => {
         fetchDescriptors(source)
           .then((result: ViewDescriptor[]) => {
             result.map((descriptor: ViewDescriptor) => {