fix(util): remove existence guards on EventTarget listener methods

on/off called addEventListener/removeEventListener via optional
chaining, turning a call on a non-EventTarget into a silent no-op
that hides subscription bugs. The type constraint already guarantees
the methods exist; invalid runtime targets now throw.

usePermission test mocks gain the listener methods a real
PermissionStatus always has.

Author: xobotyi

src/usePermission/index.dom.test.ts

@@ -9,7 +9,7 @@ describe('usePermission', () => {
 			new Promise((resolve) => {
 				setTimeout(() => {
 					// eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
-					resolve({state: 'prompt'} as PermissionStatus);
+					resolve({state: 'prompt', addEventListener() {}, removeEventListener() {}} as PermissionStatus);
 				}, 1);
 			}),
 	);
@@ -79,6 +79,7 @@ describe('usePermission', () => {
 								// eslint-disable-next-line @typescript-eslint/no-unsafe-call,@typescript-eslint/no-unsafe-return
 								setTimeout(() => listener(), 1);
 							},
+							removeEventListener() {},
 						};
 
 						resolve(status);

src/util/misc.ts

@@ -6,7 +6,7 @@ export function on<T extends EventTarget>(
 	...args: Parameters<T['addEventListener']> | [string, EventListenerOrEventListenerObject | CallableFunction, ...any]
 ): void {
 	// eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
-	object?.addEventListener?.(...(args as Parameters<HTMLElement['addEventListener']>));
+	object?.addEventListener(...(args as Parameters<HTMLElement['addEventListener']>));
 }
 
 export function off<T extends EventTarget>(
@@ -16,7 +16,7 @@ export function off<T extends EventTarget>(
 		| [string, EventListenerOrEventListenerObject | CallableFunction, ...any]
 ): void {
 	// eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
-	object?.removeEventListener?.(...(args as Parameters<HTMLElement['removeEventListener']>));
+	object?.removeEventListener(...(args as Parameters<HTMLElement['removeEventListener']>));
 }
 
 export const hasOwnProperty = <T extends Record<string | number | symbol, any>, K extends string | number | symbol>(