3 files changed, 26 insertions, 3 deletions
diff --git a/ext/node/polyfills/_utils.ts b/ext/node/polyfills/_utils.ts
index b50c113e1..79d84e00f 100644
--- a/ext/node/polyfills/_utils.ts
+++ b/ext/node/polyfills/_utils.ts
@@ -17,6 +17,7 @@ const {
 import { TextDecoder, TextEncoder } from "ext:deno_web/08_text_encoding.js";
 import { errorMap } from "ext:deno_node/internal_binding/uv.ts";
 import { codes } from "ext:deno_node/internal/error_codes.ts";
+import { ERR_NOT_IMPLEMENTED } from "ext:deno_node/internal/errors.ts";
 
 export type BinaryEncodings = "binary";
 
@@ -34,8 +35,7 @@ export type TextEncodings =
 export type Encodings = BinaryEncodings | TextEncodings;
 
 export function notImplemented(msg: string): never {
-  const message = msg ? `Not implemented: ${msg}` : "Not implemented";
-  throw new Error(message);
+  throw new ERR_NOT_IMPLEMENTED(msg);
 }
 
 export function warnNotImplemented(msg?: string) {
diff --git a/ext/node/polyfills/internal/errors.ts b/ext/node/polyfills/internal/errors.ts
index 962ca86e9..61b53fa96 100644
--- a/ext/node/polyfills/internal/errors.ts
+++ b/ext/node/polyfills/internal/errors.ts
@@ -2390,6 +2390,15 @@ export class ERR_INVALID_RETURN_VALUE extends NodeTypeError {
   }
 }
 
+export class ERR_NOT_IMPLEMENTED extends NodeError {
+  constructor(message?: string) {
+    super(
+      "ERR_NOT_IMPLEMENTED",
+      message ? `Not implemented: ${message}` : "Not implemented",
+    );
+  }
+}
+
 export class ERR_INVALID_URL extends NodeTypeError {
   input: string;
   constructor(input: string) {
@@ -2862,6 +2871,7 @@ export default {
   ERR_INVALID_SYNC_FORK_INPUT,
   ERR_INVALID_THIS,
   ERR_INVALID_TUPLE,
+  ERR_NOT_IMPLEMENTED,
   ERR_INVALID_URI,
   ERR_INVALID_URL,
   ERR_INVALID_URL_SCHEME,
diff --git a/tests/unit_node/perf_hooks_test.ts b/tests/unit_node/perf_hooks_test.ts
index d5b900041..8247f9fd3 100644
--- a/tests/unit_node/perf_hooks_test.ts
+++ b/tests/unit_node/perf_hooks_test.ts
@@ -1,6 +1,10 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 import * as perfHooks from "node:perf_hooks";
-import { performance, PerformanceObserver } from "node:perf_hooks";
+import {
+  monitorEventLoopDelay,
+  performance,
+  PerformanceObserver,
+} from "node:perf_hooks";
 import { assertEquals, assertThrows } from "@std/assert";
 
 Deno.test({
@@ -68,3 +72,12 @@ Deno.test("[perf_hooks]: eventLoopUtilization", () => {
   assertEquals(typeof obj.active, "number");
   assertEquals(typeof obj.utilization, "number");
 });
+
+Deno.test("[perf_hooks]: monitorEventLoopDelay", () => {
+  const e = assertThrows(() => {
+    monitorEventLoopDelay({ resolution: 1 });
+  });
+
+  // deno-lint-ignore no-explicit-any
+  assertEquals((e as any).code, "ERR_NOT_IMPLEMENTED");
+});