1 files changed, 29 insertions, 0 deletions
diff --git a/tests/wpt/runner/testharnessreport.js b/tests/wpt/runner/testharnessreport.js
new file mode 100644
index 000000000..7cc6a9e2d
--- /dev/null
+++ b/tests/wpt/runner/testharnessreport.js
@@ -0,0 +1,29 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+window.add_result_callback(({ message, name, stack, status }) => {
+  const data = new TextEncoder().encode(
+    `${JSON.stringify({ name, status, message, stack })}\n`,
+  );
+  let bytesWritten = 0;
+  while (bytesWritten < data.byteLength) {
+    bytesWritten += Deno.stderr.writeSync(data.subarray(bytesWritten));
+  }
+});
+
+window.add_completion_callback((_tests, harnessStatus) => {
+  const data = new TextEncoder().encode(
+    `#$#$#${JSON.stringify(harnessStatus)}\n`,
+  );
+  let bytesWritten = 0;
+  while (bytesWritten < data.byteLength) {
+    bytesWritten += Deno.stderr.writeSync(data.subarray(bytesWritten));
+  }
+
+  // TODO(cjihrig): Restore the prototype of globalThis to be an EventTarget
+  // again. There are WPTs that change the prototype, which causes brand
+  // checking to fail. Once the globalThis prototype is frozen properly, this
+  // line can be removed.
+  Object.setPrototypeOf(globalThis, EventTarget.prototype);
+
+  Deno.exit(harnessStatus.status === 0 ? 0 : 1);
+});