diff --git a/src/utils/validateTypes.js b/src/utils/validateTypes.js
index 9bf3edd5..2c3652dc 100644
--- a/src/utils/validateTypes.js
+++ b/src/utils/validateTypes.js
@@ -7,15 +7,6 @@ export function isBoolean(value) {
   return typeof value === "boolean" || value instanceof Boolean;
 }
 
-/**
- * Checks if the value is a number or a Number object.
- * @param {unknown} value
- * @returns {value is number}
- */
-function isNumber(value) {
-  return typeof value === "number" || value instanceof Number;
-}
-
 /**
  * Checks if the value is a regular expression.
  * @param {unknown} value