Fix node timers (#619)

* fix for timers

* move to banner

* chnageset

* also import corresponding clear function from node

* fix dev

* Apply suggestions from code review

Co-authored-by: Victor Berchet <victor@suumit.com>

---------

Co-authored-by: Victor Berchet <victor@suumit.com>

Author: conico974

.changeset/famous-weeks-deliver.md

@@ -0,0 +1,5 @@
+---
+"@opennextjs/cloudflare": patch
+---
+
+global timer functions now use the one from node:timers

examples/playground15/instrumentation.js

@@ -3,9 +3,16 @@ export function register() {
   //       variable as recommended in the official docs:
   //         https://nextjs.org/docs/app/building-your-application/optimizing/instrumentation#importing-runtime-specific-code
 
+  const timeout = setTimeout(() => {
+    console.log("This is a delayed log from the instrumentation register callback");
+  }, 0);
+
   if (process.env.NEXT_RUNTIME === "nodejs") {
     globalThis["__NODEJS_INSTRUMENTATION_SETUP"] =
       "this value has been set by calling the instrumentation `register` callback in the nodejs runtime";
+    // This is to test that we have access to the node version of setTimeout
+    timeout.unref();
+    clearTimeout(timeout);
   }
 
   if (process.env.NEXT_RUNTIME === "edge") {

packages/cloudflare/src/cli/build/bundle-server.ts

@@ -144,6 +144,11 @@ export async function bundleServer(buildOpts: BuildOptions): Promise<void> {
       // This define should be safe to use for Next 14.2+, earlier versions (13.5 and less) will cause trouble
       "process.env.__NEXT_EXPERIMENTAL_REACT": `${needsExperimentalReact(nextConfig)}`,
     },
+    banner: {
+      // We need to import them here, assigning them to `globalThis` does not work because node:timers use `globalThis` and thus create an infinite loop
+      // See https://github.com/cloudflare/workerd/blob/d6a764c/src/node/internal/internal_timers.ts#L56-L70
+      js: `import {setInterval, clearInterval, setTimeout, clearTimeout, setImmediate, clearImmediate} from "node:timers"`,
+    },
     platform: "node",
   });