diff --git a/x-pack/legacy/plugins/lens/public/indexpattern_plugin/lens_field_icon.tsx b/x-pack/legacy/plugins/lens/public/indexpattern_plugin/lens_field_icon.tsx
index 3a13ed7830e066..000be2ddf4d49c 100644
--- a/x-pack/legacy/plugins/lens/public/indexpattern_plugin/lens_field_icon.tsx
+++ b/x-pack/legacy/plugins/lens/public/indexpattern_plugin/lens_field_icon.tsx
@@ -31,6 +31,8 @@ export function getColorForDataType(type: string) {
   return colors[colorIndex];
 }
 
+export type UnwrapArray<T> = T extends Array<infer P> ? P : T;
+
 export function LensFieldIcon({ type }: { type: DataType }) {
   const classes = classNames(
     'lnsFieldListPanel__fieldIcon',