1 files changed, 8 insertions, 2 deletions
diff --git a/ext/node/polyfills/internal/crypto/_keys.ts b/ext/node/polyfills/internal/crypto/_keys.ts
index 9da91f022..e79986245 100644
--- a/ext/node/polyfills/internal/crypto/_keys.ts
+++ b/ext/node/polyfills/internal/crypto/_keys.ts
@@ -1,19 +1,25 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
+// This file is here because to break a circular dependency between streams and
+// crypto.
+
 // TODO(petamoriken): enable prefer-primordials for node polyfills
 // deno-lint-ignore-file prefer-primordials
 
 import { kKeyObject } from "ext:deno_node/internal/crypto/constants.ts";
+import type { KeyObject } from "ext:deno_node/internal/crypto/keys.ts";
 
 export const kKeyType = Symbol("kKeyType");
 
-export function isKeyObject(obj: unknown): boolean {
+export function isKeyObject(obj: unknown): obj is KeyObject {
   return (
     obj != null && (obj as Record<symbol, unknown>)[kKeyType] !== undefined
   );
 }
 
-export function isCryptoKey(obj: unknown): boolean {
+export function isCryptoKey(
+  obj: unknown,
+): obj is CryptoKey {
   return (
     obj != null && (obj as Record<symbol, unknown>)[kKeyObject] !== undefined
   );