fix: code

Author: himself65

lib/internal/fs/utils.js

@@ -229,6 +229,11 @@ function join(path, name) {
     return Buffer.concat([pathBuffer, name]);
   }
 
+  if (isUint8Array(path) && typeof name === 'string') {
+    const nameBuffer = Buffer.from(name);
+    return Buffer.concat([path, bufferSep, nameBuffer]);
+  }
+
   if (typeof path === 'string' && typeof name === 'string') {
     return pathModule.join(path, name);
   }
@@ -250,6 +255,12 @@ function relative(from, to) {
     return Buffer.from(pathModule.relative(Buffer.from(from), to));
   }
 
+  if (isUint8Array(from) && isUint8Array(to)) {
+    const fromPath = Buffer.from(from);
+    const toPath = Buffer.from(to);
+    return pathModule.relative(fromPath.toString(), toPath.toString());
+  }
+
   if (typeof from === 'string' && typeof to === 'string') {
     return pathModule.relative(from, to);
   }