diff --git a/js_util_module/util/src/util_js.ts b/js_util_module/util/src/util_js.ts
index ec9948ae0e41f5736712ebf26e5f3e2264d65fc3..709813823bc03cac9b4296055978553be5e1d370 100644
--- a/js_util_module/util/src/util_js.ts
+++ b/js_util_module/util/src/util_js.ts
@@ -1920,6 +1920,17 @@ class Aspect {
   }
 }
 
+interface AutoFinalizer<T> {
+  onFinalization(heldValue: T): void;
+}
+
+class AutoFinalizerCleaner {
+  static register<T>(obj: AutoFinalizer<T>, heldValue: T) {
+    let registry = new FinalizationRegistry<T>(obj.onFinalization);
+    registry.register(obj, heldValue);
+  }
+}
+
 export default {
   printf: printf,
   format: format,
@@ -1948,4 +1959,5 @@ export default {
   Type: Type,
   Aspect: Aspect,
   StringDecoder: stringdecoder,
+  AutoFinalizerCleaner: AutoFinalizerCleaner,
 };
diff --git a/js_util_module/util/tsconfig.json b/js_util_module/util/tsconfig.json
index 16b9753181ed218ecd70c76beae99adb86436325..e13ca50c080deca84684c60603a09fbd82fecb97 100644
--- a/js_util_module/util/tsconfig.json
+++ b/js_util_module/util/tsconfig.json
@@ -1,6 +1,6 @@
 {
 "compilerOptions": {
-    "target": "ES2017",
+    "target": "ES2021",
     "module": "es6",
     "rootDir": "./src",
     //"outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If `declaration` is true, also designates a file that bundles all .d.ts output. */