From dcdb18f8234be7be1e8649c8601448dde29a0f25 Mon Sep 17 00:00:00 2001
From: Mikadifo <mikadifopadillaheredia@gmail.com>
Date: Thu, 11 Sep 2025 21:44:57 -0400
Subject: [PATCH] fix user deleting negation when it's the only character left
 in the input (issue #882)

---
 src/numeric_format.tsx | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/numeric_format.tsx b/src/numeric_format.tsx
index e96cffb1..ac42d107 100644
--- a/src/numeric_format.tsx
+++ b/src/numeric_format.tsx
@@ -408,6 +408,12 @@ export function useNumericFormat<BaseType = InputAttributes>(
     const { key } = e;
     const { selectionStart, selectionEnd, value = '' } = el;
 
+    // if the input has only negation, allow the user to delete it
+    if (key === 'Backspace' && value === '-') {
+      onKeyDown(e);
+      return;
+    }
+
     // if user tries to delete partial prefix then ignore it
     if ((key === 'Backspace' || key === 'Delete') && selectionEnd < prefix.length) {
       e.preventDefault();