Add a snippet for benchmarking EventEmitter vs EventTarget

1 files changed, 49 insertions, 0 deletions

diff --git a/bench/snippets/emitter.js b/bench/snippets/emitter.js
new file mode 100644
index 000000000..4b6b8b216
--- /dev/null
+++ b/bench/snippets/emitter.js
@@ -0,0 +1,49 @@
+const EventEmitter = require("events").EventEmitter;
+import { bench, run } from "mitata";
+
+const emitter = new EventEmitter();
+const event = new Event("hello");
+emitter.on("hello", (event) => {
+  event.preventDefault();
+});
+
+var id = 0;
+bench("EventEmitter.emit", () => {
+  emitter.emit("hello", {
+    preventDefault() {
+      id++;
+    },
+  });
+});
+
+bench("EventEmitter.on x 10_000 (handler)", () => {
+  var cb = () => {
+    event.preventDefault();
+  };
+  emitter.on("hey", cb);
+  for (let i = 0; i < 10_000; i++)
+    emitter.emit("hey", {
+      preventDefault() {
+        id++;
+      },
+    });
+  emitter.off("hey", cb);
+});
+
+var target = new EventTarget();
+target.addEventListener("hello", (event) => {});
+bench("EventTarget.dispatch", () => {
+  target.dispatchEvent(event);
+});
+
+var hey = new Event("hey");
+
+bench("EventTarget.on x 10_000 (handler)", () => {
+  var handler = (event) => {};
+  target.addEventListener("hey", handler);
+
+  for (let i = 0; i < 10_000; i++) target.dispatchEvent(hey);
+  target.removeEventListener("hey", handler);
+});
+
+await run();