chore: improve DispatchingStore typings for dispatch streams

packages/hoppscotch-common/src/newstore/DispatchingStore.ts

@@ -23,12 +23,13 @@ export const defineDispatchers = <
 
 type Dispatch<
   StoreType,
-  DispatchersType extends { [x: string]: DispatcherFunc<StoreType, any> },
-  Dispatcher extends keyof DispatchersType
+  DispatchersType extends { [x: string]: DispatcherFunc<StoreType, any> }
 > = {
-  dispatcher: Dispatcher
-  payload: Parameters<DispatchersType[Dispatcher]>[1]
-}
+  [Dispatcher in keyof DispatchersType]: {
+    dispatcher: Dispatcher
+    payload: Parameters<DispatchersType[Dispatcher]>[1]
+  }
+}[keyof DispatchersType]
 
 export default class DispatchingStore<
   StoreType,
@@ -36,9 +37,7 @@ export default class DispatchingStore<
 > {
   #state$: BehaviorSubject<StoreType>
   #dispatchers: DispatchersType
-  #dispatches$: Subject<
-    Dispatch<StoreType, DispatchersType, keyof DispatchersType>
-  > = new Subject()
+  #dispatches$: Subject<Dispatch<StoreType, DispatchersType>> = new Subject()
 
   constructor(initialValue: StoreType, dispatchers: DispatchersType) {
     this.#state$ = new BehaviorSubject(initialValue)
@@ -70,10 +69,7 @@ export default class DispatchingStore<
     return this.#dispatches$
   }
 
-  dispatch<Dispatcher extends keyof DispatchersType>({
-    dispatcher,
-    payload,
-  }: Dispatch<StoreType, DispatchersType, Dispatcher>) {
+  dispatch({ dispatcher, payload }: Dispatch<StoreType, DispatchersType>) {
     if (!this.#dispatchers[dispatcher])
       throw new Error(`Undefined dispatch type '${String(dispatcher)}'`)