feat: use go tool

node_modules/is-hexadecimal/index.js

@@ -0,0 +1,17 @@
+/**
+ * Check if the given character code, or the character code at the first
+ * character, is hexadecimal.
+ *
+ * @param {string|number} character
+ * @returns {boolean} Whether `character` is hexadecimal
+ */
+export function isHexadecimal(character) {
+  const code =
+    typeof character === 'string' ? character.charCodeAt(0) : character
+
+  return (
+    (code >= 97 /* a */ && code <= 102) /* z */ ||
+    (code >= 65 /* A */ && code <= 70) /* Z */ ||
+    (code >= 48 /* A */ && code <= 57) /* Z */
+  )
+}