1 files changed, 15 insertions, 0 deletions
diff --git a/ext/node/polyfills/internal_binding/util.ts b/ext/node/polyfills/internal_binding/util.ts
index 38eeebee0..651fe9a4b 100644
--- a/ext/node/polyfills/internal_binding/util.ts
+++ b/ext/node/polyfills/internal_binding/util.ts
@@ -129,3 +129,18 @@ export function getOwnNonIndexProperties(
   }
   return result;
 }
+
+export function previewEntries(
+  iter: Iterable<unknown>,
+  isKeyValue?: boolean,
+): Array<unknown | boolean> {
+  if (isKeyValue) {
+    const arr = [...iter];
+    if (Array.isArray(arr[0]) && arr[0].length === 2) {
+      return [([] as unknown[]).concat(...arr), true];
+    }
+    return [arr, false];
+  } else {
+    return [...iter];
+  }
+}