packager: GlobalTransformCache: retry keys fetches

Reviewed By: davidaurelio

Differential Revision: D4779641

fbshipit-source-id: 1b156bf075fa2456d9e6b1a3f38855357abc1abb

packager/src/lib/GlobalTransformCache.js

@@ -239,13 +239,17 @@ class GlobalTransformCache {
    */
   static fetchResultFromURI(uri: string): Promise<CachedResult> {
     return GlobalTransformCache._fetchResultFromURI(uri).catch(error => {
-      if (!(error instanceof FetchError && error.type === 'request-timeout')) {
+      if (!GlobalTransformCache.isTimeoutError(error)) {
         throw error;
       }
       return this._fetchResultFromURI(uri);
     });
   }
 
+  static isTimeoutError(error: Error): boolean {
+    return error instanceof FetchError && error.type === 'request-timeout';
+  }
+
   shouldFetch(props: FetchProps): boolean {
     return this._profileSet.has(props.transformOptions);
   }