diff --git a/jecs.d.ts b/jecs.d.ts
index 65b6728..d2cb20d 100755
--- a/jecs.d.ts
+++ b/jecs.d.ts
@@ -350,12 +350,19 @@ export type ComponentRecord = {
 export function component_record(world: World, id: Id): ComponentRecord;
 
 type TagToUndefined<T> = T extends TagDiscriminator ? undefined : T
+type TrimOptional<T extends unknown[]> = T extends [...infer L, infer R] 
+	? unknown extends R 
+		? L | T | TrimOptional<L> 
+		: R extends undefined
+			? L | T | TrimOptional<L>
+			: T
+	: T
 
 export function bulk_insert<const C extends Id[]>(
 	world: World,
 	entity: Entity,
 	ids: C,
-	values: { [K in keyof C]: TagToUndefined<InferComponent<C[K]>> },
+	values: TrimOptional<{ [K in keyof C]: TagToUndefined<InferComponent<C[K]>> }>,
 ): void;
 export function bulk_remove(world: World, entity: Entity, ids: Id[]): void;