diff --git a/.changeset/silent-hats-stare.md b/.changeset/silent-hats-stare.md
new file mode 100644
index 000000000000..3294f491ce6d
--- /dev/null
+++ b/.changeset/silent-hats-stare.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: add type arguments to Map and Set
diff --git a/packages/svelte/src/reactivity/map.js b/packages/svelte/src/reactivity/map.js
index b2b3ab605b64..59fcfc1cf09c 100644
--- a/packages/svelte/src/reactivity/map.js
+++ b/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>>} */
diff --git a/packages/svelte/src/reactivity/set.js b/packages/svelte/src/reactivity/set.js
index 1855090cdfa5..7466885366ba 100644
--- a/packages/svelte/src/reactivity/set.js
+++ b/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>>} */
diff --git a/packages/svelte/types/index.d.ts b/packages/svelte/types/index.d.ts
index 401b569a611b..d70e59d5ebbb 100644
--- a/packages/svelte/types/index.d.ts
+++ b/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 {