1 files changed, 6 insertions, 3 deletions
diff --git a/ext/node/polyfills/internal_binding/util.ts b/ext/node/polyfills/internal_binding/util.ts
index a2d355c1e..38eeebee0 100644
--- a/ext/node/polyfills/internal_binding/util.ts
+++ b/ext/node/polyfills/internal_binding/util.ts
@@ -28,10 +28,13 @@
 // TODO(petamoriken): enable prefer-primordials for node polyfills
 // deno-lint-ignore-file prefer-primordials
 
-import { notImplemented } from "ext:deno_node/_utils.ts";
+const core = globalThis.Deno.core;
+const ops = core.ops;
 
-export function guessHandleType(_fd: number): string {
-  notImplemented("util.guessHandleType");
+const handleTypes = ["TCP", "TTY", "UDP", "FILE", "PIPE", "UNKNOWN"];
+export function guessHandleType(fd: number): string {
+  const type = ops.op_node_guess_handle_type(fd);
+  return handleTypes[type];
 }
 
 export const ALL_PROPERTIES = 0;