diff --git a/src/runtime/internal/loop.ts b/src/runtime/internal/loop.ts
index 46fab8d567..e476879951 100644
--- a/src/runtime/internal/loop.ts
+++ b/src/runtime/internal/loop.ts
@@ -1,48 +1,50 @@
 import { raf } from './environment';
-
-export interface Task {
-	abort(): void;
-	promise: Promise<void>;
-}
-
-type TaskCallback = (now: number) => boolean | void;
-type TaskEntry = { c: TaskCallback; f: () => void };
-
-const tasks = new Set<TaskEntry>();
-
-function run_tasks(now: number) {
-	tasks.forEach((task) => {
-		if (!task.c(now)) {
-			tasks.delete(task);
-			task.f();
-		}
-	});
-
-	if (tasks.size !== 0) raf(run_tasks);
+const tasks = new Set();
+/** @param {number} now
+ * @returns {void}
+ */
+function run_tasks(now) {
+    tasks.forEach((task) => {
+        if (!task.c(now)) {
+            tasks.delete(task);
+            task.f();
+        }
+    });
+    if (tasks.size !== 0)
+        raf(run_tasks);
 }
-
 /**
  * For testing purposes only!
+ * @returns {void}
  */
 export function clear_loops() {
-	tasks.clear();
+    tasks.clear();
 }
-
 /**
  * Creates a new task that runs on each raf frame
  * until it returns a falsy value or is aborted
+ * @param {TaskCallback} callback
+ * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/loop.ts-to-jsdoc").Task}
  */
-export function loop(callback: TaskCallback): Task {
-	let task: TaskEntry;
+export function loop(callback) {
+    /** @type {TaskEntry} */
+    let task;
+    if (tasks.size === 0)
+        raf(run_tasks);
+    return {
+        promise: new Promise((fulfill) => {
+            tasks.add((task = { c: callback, f: fulfill }));
+        }),
+        abort() {
+            tasks.delete(task);
+        }
+    };
+}
 
-	if (tasks.size === 0) raf(run_tasks);
 
-	return {
-		promise: new Promise((fulfill) => {
-			tasks.add((task = { c: callback, f: fulfill }));
-		}),
-		abort() {
-			tasks.delete(task);
-		}
-	};
-}
+/** @typedef {(now: number) => boolean | void} TaskCallback */
+/** @typedef {{ c: TaskCallback; f: () => void }} TaskEntry */
+
+/** @typedef {Object} Task
+ * @property {Promise<void>} promise 
+ */
\ No newline at end of file