diff --git a/packages/core/src/defer/idle_scheduler.ts b/packages/core/src/defer/idle_scheduler.ts
index 8f756dd14d3..a9822f0415f 100644
--- a/packages/core/src/defer/idle_scheduler.ts
+++ b/packages/core/src/defer/idle_scheduler.ts
@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import type {OnDestroy} from '../core';
 import {Injector, inject, ɵɵdefineInjectable} from '../di';
 import {NgZone} from '../zone';
 
@@ -39,7 +40,7 @@ const _cancelIdleCallback = () =>
  * to avoid calling `requestIdleCallback` for each defer block (e.g. if
  * defer blocks are defined inside a for loop).
  */
-export class IdleScheduler {
+export class IdleScheduler implements OnDestroy {
   // Indicates whether current callbacks are being invoked.
   executingCallbacks = false;
 
diff --git a/packages/core/src/defer/timer_scheduler.ts b/packages/core/src/defer/timer_scheduler.ts
index 03467f5e87a..85666aaa7ac 100644
--- a/packages/core/src/defer/timer_scheduler.ts
+++ b/packages/core/src/defer/timer_scheduler.ts
@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import type {OnDestroy} from '../core';
 import {Injector, ɵɵdefineInjectable} from '../di';
 import {arrayInsert2, arraySplice} from '../util/array_utils';
 import {NgZone} from '../zone';
@@ -39,7 +40,7 @@ export function scheduleTimerTrigger(delay: number, callback: VoidFunction, inje
  * to avoid calling `setTimeout` for each defer block (e.g. if defer blocks
  * are created inside a for loop).
  */
-export class TimerScheduler {
+export class TimerScheduler implements OnDestroy {
   // Indicates whether current callbacks are being invoked.
   executingCallbacks = false;
 
diff --git a/packages/core/src/profiler.ts b/packages/core/src/profiler.ts
index e0914bc4db6..1a0643c248a 100644
--- a/packages/core/src/profiler.ts
+++ b/packages/core/src/profiler.ts
@@ -14,7 +14,7 @@ let enablePerfLogging = false;
  * Function that will start measuring against the performance API
  * Should be used in pair with stopMeasuring
  */
-export function startMeasuring<T>(label: string): void {
+export function startMeasuring(label: string): void {
   if (!enablePerfLogging) {
     return;
   }