diff --git a/src/public/app/services/resizer.js b/src/public/app/services/resizer.ts
similarity index 90%
rename from src/public/app/services/resizer.js
rename to src/public/app/services/resizer.ts
index 72c90de6c..6acea693a 100644
--- a/src/public/app/services/resizer.js
+++ b/src/public/app/services/resizer.ts
@@ -1,9 +1,9 @@
 import options from "./options.js";
 
-let leftInstance;
-let rightInstance;
+let leftInstance: ReturnType<typeof Split> | null;
+let rightInstance: ReturnType<typeof Split> | null;
 
-function setupLeftPaneResizer(leftPaneVisible) {
+function setupLeftPaneResizer(leftPaneVisible: boolean) {
     if (leftInstance) {
         leftInstance.destroy();
         leftInstance = null;
diff --git a/src/public/app/types.d.ts b/src/public/app/types.d.ts
index 88f79b7eb..9b65dcdca 100644
--- a/src/public/app/types.d.ts
+++ b/src/public/app/types.d.ts
@@ -85,4 +85,11 @@ declare global {
         });
     };
     var dayjs: {};
+    var Split: (selectors: string[], config: {
+        sizes: [ number, number ];
+        gutterSize: number;
+        onDragEnd: (sizes: [ number, number ]) => void;
+    }) => {
+        destroy();
+    };
 }