diff --git a/src/CollapsableItem.ts b/src/CollapsableItem.ts
index 6a08324..dbac440 100644
--- a/src/CollapsableItem.ts
+++ b/src/CollapsableItem.ts
@@ -295,4 +295,12 @@ declare global {
 		'collapsed.collapsable': CollapsableEvent
 		'destroy.collapsable': CustomEvent
 	}
+
+	interface DocumentEventMap {
+		'expand.collapsable': CollapsableEvent
+		'expanded.collapsable': CollapsableEvent
+		'collapse.collapsable': CollapsableEvent
+		'collapsed.collapsable': CollapsableEvent
+		'destroy.collapsable': CustomEvent
+	}
 }