fix(overmind): fix base typing for transition

Author: christianalfoni

packages/node_modules/overmind/src/statemachine.ts

@@ -19,7 +19,7 @@ export interface MachineMethods<States extends TStates, Base extends IState> {
     state: T,
   ): Statemachine<States extends { current: T} ? States : never, Base> | undefined
   transition<T extends States["current"]>(
-    newState: Partial<Base> & States extends { current: T } ? States : never
+    newState: States extends { current: T } ? States & Partial<Base> : never
   ): Statemachine<States extends { current: T} ? States : never, Base> | undefined
   transition<T extends States["current"]>(
     newState: T,