diff --git a/src/main/ts/i18n.ts b/src/main/ts/i18n.ts
--- a/src/main/ts/i18n.ts
+++ b/src/main/ts/i18n.ts
@@ -2,7 +2,7 @@ import { MapOf } from "@implab/core-amd/
 import { NlsBundle } from "./NlsBundle";
 import { isPromise } from "@implab/core-amd/safe";
 
-interface OnLoad {
+export interface OnLoad {
     (result?: any): void;
     error(err: any): void;
 }