diff --git a/types/global.d.ts b/types/global.d.ts
new file mode 100644
index 0000000..1dfd799
--- /dev/null
+++ b/types/global.d.ts
@@ -0,0 +1,10 @@
+export {};
+
+declare global {
+  interface Array<T> {
+    findLast(
+      predicate: (value: T, index: number, obj: T[]) => unknown,
+      thisArg?: any
+    ): number;
+  }
+}