1 files changed, 8 insertions, 6 deletions
diff --git a/tools/wpt/testharnessreport.js b/tools/wpt/testharnessreport.js
index 8cff0752c..d3e783376 100644
--- a/tools/wpt/testharnessreport.js
+++ b/tools/wpt/testharnessreport.js
@@ -1,13 +1,15 @@
 // Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
+
 window.add_result_callback(({ message, name, stack, status }) => {
-  Deno.writeAllSync(
-    Deno.stderr,
-    new TextEncoder().encode(
-      `${JSON.stringify({ name, status, message, stack })}\n`,
-    ),
+  const data = new TextEncoder().encode(
+    `${JSON.stringify({ name, status, message, stack })}\n`,
   );
+  let bytesWritten = 0;
+  while (bytesWritten < data.byteLength) {
+    bytesWritten += Deno.stderr.writeSync(data.subarray(bytesWritten));
+  }
 });
 
-window.add_completion_callback((tests, harnessStatus) => {
+window.add_completion_callback((_tests, _harnessStatus) => {
   Deno.exit(0);
 });