Any known issue with queues on wranger

Any known issue with queues on wranger locally and react router apps? Can create a repro just wanted to check if it's something obvious first.

✘ [ERROR] Uncaught Error: Handler does not export a queue() function

✘ [ERROR] Uncaught Error: Handler does not export a queue() function

✘ [ERROR] Uncaught Error: Handler does not export a queue() function

✘ [ERROR] Uncaught Error: Handler does not export a queue() function
Got this in my workers/app.ts

export default {
async queue(batch: MessageBatch, env: any, ctx: ExecutionContext): Promise<void> {
        for (const message of batch.messages) {
            console.log('Received', message)
        }
    },

export default {
async queue(batch: MessageBatch, env: any, ctx: ExecutionContext): Promise<void> {
        for (const message of batch.messages) {
            console.log('Received', message)
        }
    },

export default {
async queue(batch: MessageBatch, env: any, ctx: ExecutionContext): Promise<void> {
        for (const message of batch.messages) {
            console.log('Received', message)
        }
    },

export default {
async queue(batch: MessageBatch, env: any, ctx: ExecutionContext): Promise<void> {
        for (const message of batch.messages) {
            console.log('Received', message)
        }
    },

will smithOP•7/31/25, 2:39 PM

running npx wrangler@latest devnpx wrangler@latest dev. I've also got async fetchasync fetch and async scheduledasync scheduled in there which work fine (except for scheduled in local obviously)

Sid•8/3/25, 1:16 PM

Well that’s interesting. Can you file an issue on Wrangler and include your wrangler version? (Although it looks like you’ve been able to repro on the latest version as well)

Gravite2090•8/7/25, 3:41 PM

I think you want ExportedHandler vs Handler if you can grab it from your cloudflare worker types / wrangler generated types.

export default {
  async queue(batch: MessageBatch<any>, env: Env, ctx: ExecutionContext): Promise<void> {
...
} satisfies ExportedHandler<Env, Error>;

export default {
  async queue(batch: MessageBatch<any>, env: Env, ctx: ExecutionContext): Promise<void> {
...
} satisfies ExportedHandler<Env, Error>;

Any known issue with queues on wranger

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