pathForAppGroup typescript error

[hengkx]

https://github.com/RonRadtke/react-native-blob-util/blob/master/fs.js#L143

[hengkx]

diff --git a/node_modules/react-native-blob-util/index.d.ts b/node_modules/react-native-blob-util/index.d.ts
index 76776ac..bd3f285 100644
--- a/node_modules/react-native-blob-util/index.d.ts
+++ b/node_modules/react-native-blob-util/index.d.ts
@@ -456,6 +456,12 @@ export interface FS {
     asset(path: string): string;
 
     df(): Promise<RNFetchBlobDf>;
+
+    /**
+     * Returns the path for the app group.
+     * @param  {string} groupName Name of app group
+     */
+    pathForAppGroup(groupName: string): Promise<string>;
 }
 
 export interface RNFetchBlobDfIOS {