diff --git a/native/schema/CommUtilsModuleSchema.js b/native/schema/CommUtilsModuleSchema.js
new file mode 100644
--- /dev/null
+++ b/native/schema/CommUtilsModuleSchema.js
@@ -0,0 +1,26 @@
+// @flow
+
+'use strict';
+
+import { TurboModuleRegistry } from 'react-native';
+import type { TurboModule } from 'react-native/Libraries/TurboModule/RCTExport.js';
+
+// codegen doesn't understand ArrayBuffers, so we need to map them to Objects
+type JSIArrayBuffer = Object;
+interface Spec extends TurboModule {
+  // filesystem utils
+  +writeBufferToFile: (path: string, data: JSIArrayBuffer) => Promise<void>;
+  +readBufferFromFile: (path: string) => Promise<JSIArrayBuffer>;
+  +base64EncodeBuffer: (data: JSIArrayBuffer) => string;
+}
+
+// for public interface, we use the correct types
+export interface UtilsModuleSpec {
+  +writeBufferToFile: (path: string, data: ArrayBuffer) => Promise<void>;
+  +readBufferFromFile: (path: string) => Promise<ArrayBuffer>;
+  +base64EncodeBuffer: (data: ArrayBuffer) => string;
+}
+
+export default (TurboModuleRegistry.getEnforcing<Spec>(
+  'CommUtilsTurboModule',
+): Spec);