feat(lib/es2021): Add type parameter to FinalizationRegistry

src/lib/esnext.weakref.d.ts

@@ -15,12 +15,12 @@ interface WeakRefConstructor {
      * Creates a WeakRef instance for the given target object.
      * @param target The target object for the WeakRef instance.
      */
-    new<T extends object>(target?: T): WeakRef<T>;
+    new<T extends object>(target: T): WeakRef<T>;
 }
 
 declare var WeakRef: WeakRefConstructor;
 
-interface FinalizationRegistry {
+interface FinalizationRegistry<T> {
     readonly [Symbol.toStringTag]: "FinalizationRegistry";
 
     /**
@@ -32,7 +32,7 @@ interface FinalizationRegistry {
      * object. If provided (and not undefined), this must be an object. If not provided, the target
      * cannot be unregistered.
      */
-    register(target: object, heldValue: any, unregisterToken?: object): void;
+    register(target: object, heldValue: T, unregisterToken?: object): void;
 
     /**
      * Unregisters an object from the registry.
@@ -43,13 +43,13 @@ interface FinalizationRegistry {
 }
 
 interface FinalizationRegistryConstructor {
-    readonly prototype: FinalizationRegistry;
+    readonly prototype: FinalizationRegistry<any>;
 
     /**
      * Creates a finalization registry with an associated cleanup callback
      * @param cleanupCallback The callback to call after an object in the registry has been reclaimed.
      */
-    new(cleanupCallback: (heldValue: any) => void): FinalizationRegistry;
+    new<T>(cleanupCallback: (heldValue: T) => void): FinalizationRegistry<T>;
 }
 
 declare var FinalizationRegistry: FinalizationRegistryConstructor;