refs #850 Add define types for displayStyle in constants

src/constants/displayStyle/index.d.ts

@@ -0,0 +1,14 @@
+export interface DisplayStyleType {
+  name: string,
+  value: number
+}
+
+export interface DisplayStyleList {
+  DisplayNameAndUsername: DisplayStyleType,
+  DisplayName: DisplayStyleType,
+  Username: DisplayStyleType
+}
+
+declare var d: DisplayStyleList
+
+export default d