Plain .js files not working: Script did not add a fetch listener

[betamint]

With the following test.js, denoflare won't start.

% cat test.js
export default {
    async fetch (request, env) {
	return new Response ('hello\n');
    },
};

% ../bin/denoflare serve test.js
Compiling https://raw.githubusercontent.com/skymethod/denoflare/v0.5.11/cli-webworker/worker.ts into worker contents...
✅ Granted write access to "/var/folders/dl/2c03sbp56t3djlcsq246h9v80000gn/T/".
Bundled https://raw.githubusercontent.com/skymethod/denoflare/v0.5.11/cli-webworker/worker.ts (process) in 1219ms
runScript: test.js
worker: start
Error running script Error: Script did not add a fetch listener
    at Function.create (blob:null/13008441-80e2-4428-9ef9-bead231069a1:614:48)
    at async Function.start (blob:null/13008441-80e2-4428-9ef9-bead231069a1:679:125)
    at async blob:null/13008441-80e2-4428-9ef9-bead231069a1:2781:22
    at async RpcChannel.receiveMessage (blob:null/13008441-80e2-4428-9ef9-bead231069a1:39:36)
    at async self.onmessage (blob:null/13008441-80e2-4428-9ef9-bead231069a1:2810:13)

.ts files works fire, however. Seems plain .js files are not supported.

[riderx]

i have the same issue in TS just add async in front of fetch break the upload