Top level await in functions.js breaks emulator

[trullock]

[REQUIRED] Environment info

firebase-tools: 14.3.1

Using node 20.19.1 or 23.6.0

Platform: Ubuntu

Similarly to #8054, if you use a top level await in your functions definition the emulator locks up and doesnt serve functions.

[REQUIRED] Test case

functions.js

import { onRequest } from 'firebase-functions/https';

const buildFunc = async () => {
	return onRequest((req, res) => {
		res.send("It works!");
	})
}

export const myFunc = await buildFunc()

[REQUIRED] Steps to reproduce

firebase emulators:start --inspect-functions

[REQUIRED] Expected behavior

TLAs should be supported in the emulator, they work on Live

[REQUIRED] Actual behavior

Functions emulator fails to start, when you request functions they hang.
Killing the emulator leaves java running with the emulator ports taken.

⚠  Error [ERR_REQUIRE_ASYNC_MODULE]: require() cannot be used on an ESM graph with top-level await. Use import() instead. To see where the top-level await comes from, use --experimental-print-required-tla.
    at ModuleJobSync.runSync (node:internal/modules/esm/module_job:393:13)
    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:363:47)
    at loadESMFromCJS (node:internal/modules/cjs/loader:1569:24)
    at Module._compile (node:internal/modules/cjs/loader:1721:5)
    at Object..js (node:internal/modules/cjs/loader:1904:10)
    at Module.load (node:internal/modules/cjs/loader:1473:32)
    at Function._load (node:internal/modules/cjs/loader:1285:12)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:234:24)
    at Module.require (node:internal/modules/cjs/loader:1495:12)
⚠  We were unable to load your functions code. (see above)
⚠  functions: Failed to initialize and load triggers. This shouldn't happen: require() cannot be used on an ESM graph with top-level await. Use import() instead. To see where the top-level await comes from, use --experimental-print-required-tla.
⚠  Your function was killed because it raised an unhandled error.
⬢  functions: Failed to handle request for function us-central1-myFunc
⬢  functions: Failed to start functions in /home/trullock/git/firebase-test/functions: FirebaseError: Failed to load function.

[aalej]

Hey @trullock, apologies for not being able to respond to #8054 and thanks for opening up this report. I'm able to reproduce the issue as well. Let me raise this to our engineering team.

[trullock]

It doesnt even need to be the func thats async, just any top level await.

await foo();

export const myFn = whatever;

[joehan]

#8394 might fix this - can functions folks review this?

[trullock]

Looks like it