fix(overmind): fix type bug with IState and IEffects

Author: christianalfoni

packages/node_modules/overmind/src/index.ts

@@ -72,13 +72,15 @@ export type TState<Config extends Configuration> = [Config['state']] extends [
         { state: {} }
       >[P]['state']
     }
-  : Config['state'] &
-      {
-        [P in keyof SubType<Config['modules'], { state: {} }>]: SubType<
-          Config['modules'],
-          { state: {} }
-        >[P]['state']
-      }
+  : [Config['modules']] extends [undefined]
+    ? Config['state']
+    : Config['state'] &
+        {
+          [P in keyof SubType<Config['modules'], { state: {} }>]: SubType<
+            Config['modules'],
+            { state: {} }
+          >[P]['state']
+        }
 
 export type TEffects<Config extends Configuration> = [
   Config['effects']
@@ -89,13 +91,15 @@ export type TEffects<Config extends Configuration> = [
         { effects: object }
       >[P]['effects']
     }
-  : Config['effects'] &
-      {
-        [P in keyof SubType<Config['modules'], { effects: object }>]: SubType<
-          Config['modules'],
-          { effects: object }
-        >[P]['effects']
-      }
+  : [Config['modules']] extends [undefined]
+    ? Config['effects']
+    : Config['effects'] &
+        {
+          [P in keyof SubType<Config['modules'], { effects: object }>]: SubType<
+            Config['modules'],
+            { effects: object }
+          >[P]['effects']
+        }
 
 export type Mutate<Value = any> = (state: IApp['state'], value: Value) => void