diff --git a/packages/svelte/src/internal/client/dom/blocks/boundary.js b/packages/svelte/src/internal/client/dom/blocks/boundary.js
index ee7369c0c8..513dd1abf1 100644
--- a/packages/svelte/src/internal/client/dom/blocks/boundary.js
+++ b/packages/svelte/src/internal/client/dom/blocks/boundary.js
@@ -498,6 +498,9 @@ export function add_boundary_callback(boundary, fn) {
 	boundary.fn(ADD_CALLBACK, fn);
 }
 
+/**
+ * @returns {boolean}
+ */
 export function isPending() {
 	var effect = active_effect;
 	var boundary = get_boundary(effect);
diff --git a/packages/svelte/types/index.d.ts b/packages/svelte/types/index.d.ts
index c32882c132..485a39c600 100644
--- a/packages/svelte/types/index.d.ts
+++ b/packages/svelte/types/index.d.ts
@@ -419,6 +419,7 @@ declare module 'svelte' {
 		render: () => string;
 		setup?: (element: Element) => void | (() => void);
 	}): Snippet<Params>;
+	export function isPending(): boolean;
 	/** Anything except a function */
 	type NotFunction<T> = T extends Function ? never : T;
 	/**