diff --git a/Frontend/src/components/XsltParamComponent.vue b/Frontend/src/components/XsltParamComponent.vue
index 4bd93bb..42761b9 100644
--- a/Frontend/src/components/XsltParamComponent.vue
+++ b/Frontend/src/components/XsltParamComponent.vue
@@ -17,7 +17,7 @@ const nameInput = ref('')
 const valueInput = ref('')
 const selectedOption = ref(options.value[0].name)
 
-const isNumeric = (string) => /^[+-]?\d+(\.\d+)?$/.test(string)
+const isNumeric = (string : string) => /^[+-]?\d+(\.\d+)?$/.test(string)
 
 const selectedFunction = () => {
   const action = selectOption(selectedOption.value);