fix(overmind): fix typing issue with derived

Author: christianalfoni

packages/node_modules/overmind/src/internalTypes.ts

@@ -155,7 +155,7 @@ export type ResolveState<State extends IState | null | undefined> = State extend
   ? State
   : {
       [P in keyof State]: State[P] extends (parent: ResolveState<IState>, root: any) => any
-        ? ReturnType<State[P]>
+        ? State[P] extends () => any ? State[P] : ReturnType<State[P]>
         : State[P] extends Array<any>
         ? State[P]
         : State[P] extends IState | null