fix(overmind): fix null typing of ResolveState

Author: christianalfoni

packages/node_modules/overmind/src/internalTypes.ts

@@ -153,14 +153,14 @@ export interface Events {
 
 type Derived = (parent: any, config: any) => any
 
-export type ResolveState<State extends IState> = State extends undefined
+export type ResolveState<State extends IState | null> = State extends undefined
   ? {}
   : {
       [P in keyof State]: State[P] extends Derived
         ? ReturnType<State[P]>
         : State[P] extends Array<any>
         ? State[P]
-        : State[P] extends IState
+        : State[P] extends IState | null
         ? ResolveState<State[P]>
         : State[P]
     }