fix(overmind): fix TApp to not produce \ if effects is empty

Author: gaspard

packages/node_modules/overmind/src/internalTypes.ts

@@ -106,6 +106,6 @@ export type ResolveActions<Actions extends { [key: string]: any }> = {
     : {
         [P in keyof Actions[T]]: Actions[T][P] extends Function
           ? ReturnType<Actions[T][P]>
-          : undefined
+          : Actions[T][P]
       }
 }

packages/node_modules/overmind/src/types.ts

@@ -24,9 +24,12 @@ export interface TApp<Config extends Configuration> {
   state: ResolveState<Config['state'] & {}>
   // Transform actions into callable functions.
   actions: ResolveActions<Config['actions'] & {}>
-  effects: Config['effects'] & {}
+  effects: [Config['effects']] extends [void] ? {} : Config['effects'] & {}
 }
 
+// type CheckEffects = TApp<{}>['effects'] // => should produce {}
+// type CheckActions = TApp<{}>['actions'] // => should produce {}
+
 export type TContext<App extends BaseApp, Value> = TBaseContext<App> & {
   value: Value
 }