simplified version files

src/commands/index.ts

@@ -32,7 +32,10 @@ const getCommand = (
   version: USPVersion,
   commandType: CommandType
 ): CommandObject | null =>
-  versionSpecificCommands[version][commandType] || common[commandType] || null;
+  version in versionSpecificCommands &&
+  commandType in versionSpecificCommands[version]
+    ? versionSpecificCommands[version][commandType]
+    : common[commandType] || null;
 
 const recipes: RecipeObject[] = [resolve as any, operateRecipe, subscribe];