diff --git a/Shared.fsx b/Shared.fsx
index 3224a3438..11a758c45 100644
--- a/Shared.fsx
+++ b/Shared.fsx
@@ -316,7 +316,8 @@ let knownWorkerInterfaces =
       "MSAppAsyncOperation"; "MSAppView"; "MSBaseReader"; "MSBlobBuilder"; "MSExecAtPriorityFunctionCallback";
       "MSLaunchUriCallback"; "MSStream"; "MSStreamReader"; "MSUnsafeFunctionCallback"; "NavigatorID"; "NavigatorOnLine";
       "Position"; "PositionCallback"; "PositionError"; "PositionErrorCallback"; "ProgressEvent"; "WebSocket";
-      "WindowBase64"; "WindowConsole"; "Worker"; "XMLHttpRequest"; "XMLHttpRequestEventTarget"; "XMLHttpRequestUpload" ]
+      "WindowBase64"; "WindowConsole"; "Worker"; "XMLHttpRequest"; "XMLHttpRequestEventTarget"; "XMLHttpRequestUpload";
+      "IDBObjectStoreParameters"; "IDBIndexParameters"; "IDBKeyPath"]
     |> set
 
 let GetAllInterfacesByFlavor flavor =
diff --git a/TS.fsx b/TS.fsx
index 6fa8a77aa..7fec0861e 100644
--- a/TS.fsx
+++ b/TS.fsx
@@ -629,7 +629,10 @@ let EmitTypeDefs flavor =
     let EmitTypeDefFromJson (typeDef: ItemsType.Root) =
         Pt.printl "type %s = %s;" typeDef.Name.Value typeDef.Type.Value
 
-    if flavor <> Flavor.Worker then
+    match flavor with
+    | Flavor.Worker -> 
+        browser.Typedefs |> Array.filter (fun typedef -> knownWorkerInterfaces.Contains typedef.NewType) |> Array.iter EmitTypeDef
+    | _ ->
         browser.Typedefs |> Array.iter EmitTypeDef
 
     JsonItems.getAddedItems ItemKind.TypeDef flavor
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index 6ca8e81d5..e7bf11472 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -8,6 +8,16 @@ interface EventInit {
     cancelable?: boolean;
 }
 
+interface IDBIndexParameters {
+    multiEntry?: boolean;
+    unique?: boolean;
+}
+
+interface IDBObjectStoreParameters {
+    autoIncrement?: boolean;
+    keyPath?: IDBKeyPath;
+}
+
 interface EventListener {
     (evt: Event): void;
 }
@@ -991,4 +1001,5 @@ declare var console: Console;
 declare function addEventListener(type: "error", listener: (ev: ErrorEvent) => any, useCapture?: boolean): void;
 declare function addEventListener(type: "message", listener: (ev: MessageEvent) => any, useCapture?: boolean): void;
 declare function addEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void;
+type IDBKeyPath = string;
 type IDBValidKey = number | string | Date | IDBArrayKey;
\ No newline at end of file