diff --git a/fontoxml/fontoxml-tests.ts b/fontoxml/fontoxml-tests.ts
index 7821806cf2..11d47db895 100644
--- a/fontoxml/fontoxml-tests.ts
+++ b/fontoxml/fontoxml-tests.ts
@@ -25,4 +25,11 @@ var simpleinit:com.fontoxml.IInvocator = {
 	documentIds: ["11-22-33","44-55-66"],
 	cmsBaseUrl: "/test/",
 	editSessionToken: "aa-bb-cc-dd-ee"
+}
+
+var eventData:com.fontoxml.IFontoMessageEventData = {
+	command: "test-command",
+	type: "test-type",
+	scope: init,
+	metadata: {}
 }
\ No newline at end of file
diff --git a/fontoxml/fontoxml.d.ts b/fontoxml/fontoxml.d.ts
index 4d621c234c..8e6a0a2c76 100644
--- a/fontoxml/fontoxml.d.ts
+++ b/fontoxml/fontoxml.d.ts
@@ -37,4 +37,13 @@ declare module com.fontoxml
 		roleId:string;
 	}
 	
+	//This is describes the object that is assigned to the MessageEvent.data
+	//property after the FontoXML editor posts a message
+	export interface IFontoMessageEventData {
+		command: string;
+		type: string;
+		scope: com.fontoxml.IInvocator;
+		metadata: any;
+	}
+
 }
\ No newline at end of file