diff --git a/src/lib/utils/getContainerNode.ts b/src/lib/utils/getContainerNode.ts
index 2d306903faa..03974f7aefc 100644
--- a/src/lib/utils/getContainerNode.ts
+++ b/src/lib/utils/getContainerNode.ts
@@ -23,7 +23,7 @@ function getContainerNode(selectorOrHTMLElement: string | HTMLElement) {
     throw new Error(errorMessage);
   }
 
-  return domElement as HTMLElement;
+  return domElement;
 }
 
 export default getContainerNode;
diff --git a/src/lib/utils/isDomElement.js b/src/lib/utils/isDomElement.ts
similarity index 63%
rename from src/lib/utils/isDomElement.js
rename to src/lib/utils/isDomElement.ts
index 209101947ce..7f5ec9aa9e1 100644
--- a/src/lib/utils/isDomElement.js
+++ b/src/lib/utils/isDomElement.ts
@@ -1,5 +1,6 @@
-function isDomElement(object) {
+function isDomElement(object: any): object is HTMLElement {
   return (
+    // @ts-ignore
     object instanceof window.HTMLElement ||
     (Boolean(object) && object.nodeType > 0)
   );