perf(ext/fetch): Use the WebIDL conversion to DOMString rather than USVString for Response constructor (#12201)

1 files changed, 34 insertions, 0 deletions

diff --git a/cli/tests/testdata/response_string_perf.js b/cli/tests/testdata/response_string_perf.js
new file mode 100644
index 000000000..f55376c77
--- /dev/null
+++ b/cli/tests/testdata/response_string_perf.js
@@ -0,0 +1,34 @@
+const mixed = "@Ā๐😀";
+
+function generateRandom(bytes) {
+  let result = "";
+  let i = 0;
+  while (i < bytes) {
+    const toAdd = Math.floor(Math.random() * Math.min(4, bytes - i));
+    switch (toAdd) {
+      case 0:
+        result += mixed[0];
+        i++;
+        break;
+      case 1:
+        result += mixed[1];
+        i++;
+        break;
+      case 2:
+        result += mixed[2];
+        i++;
+        break;
+      case 3:
+        result += mixed[3];
+        result += mixed[4];
+        i += 2;
+        break;
+    }
+  }
+  return result;
+}
+
+const randomData = generateRandom(1024);
+for (let i = 0; i < 10_000; i++) {
+  new Response(randomData);
+}