fix: use type arguments when extending Map/Set (#10820)

* use type arguments when extending Map/Set

* changeset

Author: Rich-Harris

.changeset/silent-hats-stare.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: add type arguments to Map and Set

packages/svelte/src/reactivity/map.js

@@ -7,6 +7,7 @@ import { map } from './utils.js';
 /**
  * @template K
  * @template V
+ * @extends {Map<K, V>}
  */
 export class ReactiveMap extends Map {
 	/** @type {Map<K, import('#client').Source<V>>} */

packages/svelte/src/reactivity/set.js

@@ -10,6 +10,7 @@ var inited = false;
 
 /**
  * @template T
+ * @extends {Set<T>}
  */
 export class ReactiveSet extends Set {
 	/** @type {Map<T, import('#client').Source<boolean>>} */

packages/svelte/types/index.d.ts

@@ -1985,38 +1985,18 @@ declare module 'svelte/reactivity' {
 		constructor(...values: any[]);
 		#private;
 	}
-	class ReactiveSet<T> extends Set<any> {
+	class ReactiveSet<T> extends Set<T> {
 
 		constructor(value?: Iterable<T> | null | undefined);
 
-		has(value: T): boolean;
-		
 		add(value: T): this;
-		
-		delete(value: T): boolean;
-		keys(): IterableIterator<T>;
-		values(): IterableIterator<T>;
-		entries(): IterableIterator<[T, T]>;
-		[Symbol.iterator](): IterableIterator<T>;
 		#private;
 	}
-	class ReactiveMap<K, V> extends Map<any, any> {
+	class ReactiveMap<K, V> extends Map<K, V> {
 
 		constructor(value?: Iterable<readonly [K, V]> | null | undefined);
 
-		has(key: K): boolean;
-		
-		forEach(callbackfn: (value: V, key: K, map: Map<K, V>) => void, this_arg?: any): void;
-		
-		get(key: K): V | undefined;
-		
 		set(key: K, value: V): this;
-		
-		delete(key: K): boolean;
-		keys(): IterableIterator<K>;
-		values(): IterableIterator<V>;
-		entries(): IterableIterator<[K, V]>;
-		[Symbol.iterator](): IterableIterator<[K, V]>;
 		#private;
 	}
 	class ReactiveURL extends URL {