idb: extend test case

1 files changed, 1 insertions, 1 deletions

diff --git a/packages/idb-bridge/src/tree/interfaces.ts b/packages/idb-bridge/src/tree/interfaces.ts
index c708c20b5..6bd0cdf58 100644
--- a/packages/idb-bridge/src/tree/interfaces.ts
+++ b/packages/idb-bridge/src/tree/interfaces.ts
@@ -53,7 +53,7 @@ export interface IMapSource<K=any, V=any> extends ISetSource<K>
   /** Calls callbackFn once for each key-value pair present in the map object.
    *  The ES6 Map class sends the value to the callback before the key, so
    *  this interface must do likewise. */
-  forEach(callbackFn: (v:V, k:K, map:IMapSource<K,V>) => void, thisArg: any): void;
+  forEach(callbackFn: (v:V, k:K, map:IMapSource<K,V>) => void, thisArg?: any): void;
   
   /** Returns an iterator that provides all key-value pairs from the collection (as arrays of length 2). */
   entries(): IterableIterator<[K,V]>;