diff --git a/.prettierrc.js b/.prettierrc.js
index b6602b4d50..c54967bab3 100644
--- a/.prettierrc.js
+++ b/.prettierrc.js
@@ -7,4 +7,5 @@ module.exports = {
   tabWidth: 2,
   useTabs: false,
   bracketSpacing: true,
+  trailingComma: "es5",
 };
diff --git a/packages/world/ts/library/config/types.ts b/packages/world/ts/library/config/types.ts
index 5cb70b6910..3a590229f0 100644
--- a/packages/world/ts/library/config/types.ts
+++ b/packages/world/ts/library/config/types.ts
@@ -5,30 +5,29 @@ import { zWorldConfig } from "./worldConfig";
 import { SYSTEM_DEFAULTS } from "./defaults";
 
 // zod doesn't preserve doc comments
-export type SystemUserConfig =
+export type SystemUserConfig = {
+  /** The full resource selector consists of namespace and name */
+  name?: string;
+  /**
+   * Register function selectors for the system in the World.
+   * Defaults to true.
+   * Note:
+   * - For root systems all World function selectors will correspond to the system's function selectors.
+   * - For non-root systems, the World function selectors will be <namespace>_<system>_<function>.
+   */
+  registerFunctionSelectors?: boolean;
+} & (
   | {
-      /** The full resource selector consists of namespace and name */
-      name?: string;
-      /**
-       * Register function selectors for the system in the World.
-       * Defaults to true.
-       * Note:
-       * - For root systems all World function selectors will correspond to the system's function selectors.
-       * - For non-root systems, the World function selectors will be <namespace>_<system>_<function>.
-       */
-      registerFunctionSelectors?: boolean;
-    } & (
-      | {
-          /** If openAccess is true, any address can call the system */
-          openAccess?: true;
-        }
-      | {
-          /** If openAccess is false, only the addresses or systems in `access` can call the system */
-          openAccess: false;
-          /** An array of addresses or system names that can access the system */
-          accessList: string[];
-        }
-    );
+      /** If openAccess is true, any address can call the system */
+      openAccess?: true;
+    }
+  | {
+      /** If openAccess is false, only the addresses or systems in `access` can call the system */
+      openAccess: false;
+      /** An array of addresses or system names that can access the system */
+      accessList: string[];
+    }
+);
 
 export interface ExpandSystemConfig<T extends SystemUserConfig, SystemName extends string>
   extends OrDefaults<