diff --git a/lib/utils/debounce.js b/lib/utils/debounce.js
index 6cafd8cb47..622e22d35e 100644
--- a/lib/utils/debounce.js
+++ b/lib/utils/debounce.js
@@ -144,7 +144,7 @@ export const enqueueDebouncer = function(debouncer) {
 /**
  * Flushes any enqueued debouncers
  *
- * @return {void}
+ * @return {boolean} Returns whether any debouncers were flushed
  */
 export const flushDebouncers = function() {
   const didFlush = Boolean(debouncerQueue.size);
diff --git a/lib/utils/gestures.js b/lib/utils/gestures.js
index 7b4bda4655..f5f4bfd680 100644
--- a/lib/utils/gestures.js
+++ b/lib/utils/gestures.js
@@ -179,7 +179,7 @@ let mouseCanceller = function(mouseEvent) {
       if (path[i].nodeType === Node.ELEMENT_NODE) {
         if (path[i].localName === 'label') {
           clickedLabels.push(/** @type {!HTMLLabelElement} */ (path[i]));
-        } else if (canBeLabelled(path[i])) {
+        } else if (canBeLabelled(/** @type {!HTMLElement} */ (path[i]))) {
           let ownerLabels =
               matchingLabels(/** @type {!HTMLElement} */ (path[i]));
           // check if one of the clicked labels is labelling this element
@@ -387,7 +387,7 @@ export function deepTargetFind(x, y) {
  * @return {EventTarget} Returns the event target.
  */
 function _findOriginalTarget(ev) {
-  const path = getComposedPath(/** @type {?Event} */ev);
+  const path = getComposedPath(/** @type {?Event} */ (ev));
   // It shouldn't be, but sometimes path is empty (window on Safari).
   return path.length > 0 ? path[0] : ev.target;
 }