perf: optimize URL serialization (denoland#15663)

Author: littledivy

cli/bench/url_parse.js

@@ -0,0 +1,22 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+const queueMicrotask = globalThis.queueMicrotask || process.nextTick;
+let [total, count] = typeof Deno !== "undefined"
+  ? Deno.args
+  : [process.argv[2], process.argv[3]];
+
+total = total ? parseInt(total, 0) : 50;
+count = count ? parseInt(count, 10) : 10000000;
+
+function bench(fun) {
+  const start = Date.now();
+  for (let i = 0; i < count; i++) fun();
+  const elapsed = Date.now() - start;
+  const rate = Math.floor(count / (elapsed / 1000));
+  console.log(`time ${elapsed} ms rate ${rate}`);
+  if (--total) queueMicrotask(() => bench(fun));
+}
+
+bench(() => {
+  const url = new URL("http://example.com/");
+  url.pathname;
+});

core/Cargo.toml

@@ -32,7 +32,7 @@ serde = { version = "1.0.136", features = ["derive"] }
 serde_json = { version = "1.0.79", features = ["preserve_order"] }
 serde_v8 = { version = "0.61.0", path = "../serde_v8" }
 sourcemap = "=6.0.1"
-url = { version = "2.3.1", features = ["serde"] }
+url = { version = "2.3.1", features = ["serde", "expose_internals"] }
 v8 = { version = "0.49.0", default-features = false }
 
 [[example]]