diff --git a/src/runtime/ambient.d.ts b/src/runtime/ambient.ts
similarity index 100%
rename from src/runtime/ambient.d.ts
rename to src/runtime/ambient.ts
diff --git a/src/runtime/index.ts b/src/runtime/index.ts
index 91b10537bb..2029f67a04 100644
--- a/src/runtime/index.ts
+++ b/src/runtime/index.ts
@@ -1,4 +1,4 @@
-import './ambient.d.ts';
+import './ambient';
 
 export {
 	onMount,
diff --git a/src/runtime/internal/utils.ts b/src/runtime/internal/utils.ts
index ff0b0e4c69..3996f1fe00 100644
--- a/src/runtime/internal/utils.ts
+++ b/src/runtime/internal/utils.ts
@@ -72,7 +72,6 @@ export function subscribe<T, S extends Readable<T>>(store: S, ...callbacks: Arra
 	if (store == null) {
 		return noop;
 	}
-	// TODO: `store` does not accept an array of callbacks
 	const unsub: any = store.subscribe(...(callbacks as [any]));
 	return unsub.unsubscribe ? () => unsub.unsubscribe() : unsub;
 }
@@ -87,8 +86,6 @@ export function component_subscribe<T, S extends Readable<T>>(component: SvelteC
 	component.$$.on_destroy.push(subscribe(store, callback));
 }
 
-// TODO: find out what types are expected here instead of using `any` everywhere 
-
 export function create_slot(definition: any[], ctx: any[], $$scope: T$$, fn: Function) {
 	if (definition) {
 		const slot_ctx = get_slot_context(definition, ctx, $$scope, fn);