Adding the rest back in.

node_modules/@fastify/busboy/lib/utils/basename.js

@@ -0,0 +1,14 @@
+'use strict'
+
+module.exports = function basename (path) {
+  if (typeof path !== 'string') { return '' }
+  for (var i = path.length - 1; i >= 0; --i) { // eslint-disable-line no-var
+    switch (path.charCodeAt(i)) {
+      case 0x2F: // '/'
+      case 0x5C: // '\'
+        path = path.slice(i + 1)
+        return (path === '..' || path === '.' ? '' : path)
+    }
+  }
+  return (path === '..' || path === '.' ? '' : path)
+}