diff --git a/js/meshopt_simplifier.js b/js/meshopt_simplifier.js
index 3daeb380..73590683 100644
--- a/js/meshopt_simplifier.js
+++ b/js/meshopt_simplifier.js
@@ -155,6 +155,8 @@ var MeshoptSimplifier = (function() {
 
 	var simplifyOptions = {
 		LockBorder: 1,
+		Sparse: 2,
+		ErrorAbsolute: 4,
 	};
 
 	return {
diff --git a/js/meshopt_simplifier.module.d.ts b/js/meshopt_simplifier.module.d.ts
index 7e95ad83..b0131756 100644
--- a/js/meshopt_simplifier.module.d.ts
+++ b/js/meshopt_simplifier.module.d.ts
@@ -1,6 +1,6 @@
 // This file is part of meshoptimizer library and is distributed under the terms of MIT License.
 // Copyright (C) 2016-2024, by Arseny Kapoulkine (arseny.kapoulkine@gmail.com)
-export type Flags = "LockBorder";
+export type Flags = "LockBorder" | "Sparse" | "ErrorAbsolute";
 
 export const MeshoptSimplifier: {
     supported: boolean;
diff --git a/js/meshopt_simplifier.module.js b/js/meshopt_simplifier.module.js
index a4ff5f1f..5b540a4a 100644
--- a/js/meshopt_simplifier.module.js
+++ b/js/meshopt_simplifier.module.js
@@ -154,6 +154,8 @@ var MeshoptSimplifier = (function() {
 
 	var simplifyOptions = {
 		LockBorder: 1,
+		Sparse: 2,
+		ErrorAbsolute: 4,
 	};
 
 	return {