Merge pull request #11704 from Microsoft/refactor_module_resolution

Return both ts and js results from module resolution

src/services/shims.ts

@@ -328,7 +328,7 @@ namespace ts {
                     const resolutionsInFile = <MapLike<string>>JSON.parse(this.shimHost.getModuleResolutionsForFile(containingFile));
                     return map(moduleNames, name => {
                         const result = getProperty(resolutionsInFile, name);
-                        return result ? { resolvedFileName: result } : undefined;
+                        return result ? { resolvedFileName: result, extension: extensionFromPath(result), isExternalLibraryImport: false } : undefined;
                     });
                 };
             }