first commit

packages/dev-server/test/hmr.test.ts

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+import { expect, test } from "bun:test";
+import { HMR_CLIENT_JS } from "../src/runtime.ts";
+
+test("HMR client syncs fresh HTML over the websocket", () => {
+  expect(HMR_CLIENT_JS).toContain('send({ type: "sync"');
+  expect(HMR_CLIENT_JS).toContain('msg.type === "html"');
+  expect(HMR_CLIENT_JS).toContain("applyHtml(msg.html)");
+  expect(HMR_CLIENT_JS).not.toContain("fetch(location.href");
+  expect(HMR_CLIENT_JS).not.toContain("location.reload()");
+});