diff --git a/plugins/store/guest-js/index.ts b/plugins/store/guest-js/index.ts
index b943b0f2..7f259230 100644
--- a/plugins/store/guest-js/index.ts
+++ b/plugins/store/guest-js/index.ts
@@ -29,7 +29,7 @@ export class Store {
    * @returns
    */
   async set(key: string, value: unknown): Promise<void> {
-    await invoke("plugin:store|set", {
+    return await invoke("plugin:store|set", {
       path: this.path,
       key,
       value,
@@ -115,7 +115,7 @@ export class Store {
    *
    * @returns
    */
-  async values(): Promise<string[]> {
+  async values<T>(): Promise<T[]> {
     return await invoke("plugin:store|values", {
       path: this.path,
     });
@@ -137,7 +137,7 @@ export class Store {
    *
    * @returns
    */
-  async length(): Promise<string[]> {
+  async length(): Promise<number> {
     return await invoke("plugin:store|length", {
       path: this.path,
     });
@@ -160,8 +160,8 @@ export class Store {
   /**
    * Saves the store to disk at the stores `path`.
    *
-   * As the store is only persistet to disk before the apps exit, changes might be lost in a crash.
-   * This method let's you persist the store to disk whenever you deem necessary.
+   * As the store is only persisted to disk before the apps exit, changes might be lost in a crash.
+   * This method lets you persist the store to disk whenever you deem necessary.
    * @returns
    */
   async save(): Promise<void> {
@@ -196,7 +196,7 @@ export class Store {
    * @returns A promise resolving to a function to unlisten to the event.
    */
   async onChange(
-    cb: (key: string, value: unknown) => void
+    cb: (key: string, value: T | null) => void
   ): Promise<UnlistenFn> {
     return await appWindow.listen<ChangePayload<unknown>>(
       "store://change",