diff --git a/src/modules/functions.export.ts b/src/modules/functions.export.ts
index b68b581..2c83b5e 100644
--- a/src/modules/functions.export.ts
+++ b/src/modules/functions.export.ts
@@ -1,13 +1,13 @@
-export function range(start: number, stop: number, step = 1) {
+export function range(start: number, stop: number, step: number = 1) {
   const isPositive = step > 0;
-  let numbers = [];
+  let numbers: Array<number> = [];
 
   if (stop === undefined) {
     stop = start;
     start = 0;
   }
 
-  for (let i = start; isPositive ? i < stop : i > stop; i += step) {
+  for (let i: number = start; isPositive ? i < stop : i > stop; i += step) {
     numbers.push(i);
   }