diff --git a/js/tree-v1/tree-store.ts b/js/tree-v1/tree-store.ts
index b7584f1075..3b0a7dd654 100644
--- a/js/tree-v1/tree-store.ts
+++ b/js/tree-v1/tree-store.ts
@@ -155,7 +155,7 @@ export class TreeStore {
   public setConfig(options: TypeTreeStoreOptions) {
     const { config } = this;
     let hasChanged = false;
-    (Object.keys(options) as (keyof TypeTreeStoreOptions)[]).forEach((key) => {
+    (Object.keys(options)).forEach((key: keyof TypeTreeStoreOptions) => {
       const val = options[key];
       if (val !== config[key]) {
         hasChanged = true;
diff --git a/js/tree/tree-store.ts b/js/tree/tree-store.ts
index 162a306b1a..c6a955cb95 100644
--- a/js/tree/tree-store.ts
+++ b/js/tree/tree-store.ts
@@ -159,7 +159,7 @@ export class TreeStore {
   public setConfig(options: TypeTreeStoreOptions) {
     const { config } = this;
     let hasChanged = false;
-    (Object.keys(options) as (keyof TypeTreeStoreOptions)[]).forEach((key) => {
+    (Object.keys(options)).forEach((key: keyof TypeTreeStoreOptions) => {
       const val = options[key];
       if (val !== config[key]) {
         hasChanged = true;