Hey guys, I am getting an error when using this new Workflow API sendEvent in the production environ

Hey guys,
I am getting an error when using this new Workflow API sendEvent in the production environment. Local works as expected.

const workflow = await this.env.CONNECTIONS_WORKFLOW.get(workflowId);
    await workflow.sendEvent({ type: 'form-submission', payload });

const workflow = await this.env.CONNECTIONS_WORKFLOW.get(workflowId);
    await workflow.sendEvent({ type: 'form-submission', payload });

Error message:

TypeError: (intermediate value).sendEvent is not a function

TypeError: (intermediate value).sendEvent is not a function

Adrien•4/7/25, 7:45 PM

Hey and congrats for GA

!
Is it possible to have an in-progress state that could be queried? In the case of an onboarding workflow, while we wait on a specific outside event, we can fetch the status of the workflow and some arbitrary data. Maybe similar to Temporal Query feature?

SSuman!Hey guys, I am getting an error when using this new Workflow API sendEvent in th...

Jadugar_Jaggu•4/7/25, 7:52 PM

update your project wrangler version

JJadugar_Jaggu update your project wrangler version

Suman!OP•4/7/25, 7:53 PM

I think it's already at its peak

SSuman!I think it's already at its peak

Jadugar_Jaggu•4/7/25, 7:56 PM

it may be a global wrangler, check inside package.json what is the wrangler version

JJadugar_Jaggu it may be a global wrangler, check inside package.json what is the wrangler vers...

Suman!OP•4/7/25, 7:57 PM

Same - 4.8.0

SSuman!Same - 4.8.0

Jadugar_Jaggu•4/7/25, 7:57 PM

did you generate types ? npm run cf-typegen

JJadugar_Jaggu did you generate types ? npm run cf-typegen

Suman!OP•4/7/25, 7:59 PM

Yes

SSuman!Hey guys, I am getting an error when using this new Workflow API sendEvent in th...

Matt Silverlock•4/8/25, 12:34 AM

workflow

workflow

definitely a

WorkflowInstance

WorkflowInstance

? Can you call

await workflow.status()

await workflow.status()

successfully?

jcheese•4/8/25, 1:26 AM

hi guys - is there a way to repeat the workflow multiple times? for example, when i go through step 1 - 5, and if some condition isnt met, start again from step 1. sort of like a recursive function

gruntlord6•4/8/25, 2:51 AM

Is there plans to have a template like other workers as an example?

gruntlord6•4/8/25, 2:53 AM

I see the example but I find working templates are a much better way to get started

MMatt Silverlock Is `workflow` definitely a `WorkflowInstance` - ? Can you call `await workflow.s...

Suman!OP•4/8/25, 4:03 AM

Yep - It is a

WorkflowInstance

WorkflowInstance

and I can call

await workflow.status()

await workflow.status()

. Getting issue only calling

sendEvent

sendEvent

TypeError: a.sendEvent is not a function

TypeError: a.sendEvent is not a function

and this occurs only on the production environment. Local works good.

Logging -

console.log({ status: (await workflow.status()).status, workflow: JSON.stringify(workflow) });

console.log({ status: (await workflow.status()).status, workflow: JSON.stringify(workflow) });

workflow = {"fetcher":{},"id":"dcd3c481-07d4-44ff-bcd5-94e2502bc6ff"}"
status = "running"

workflow = {"fetcher":{},"id":"dcd3c481-07d4-44ff-bcd5-94e2502bc6ff"}"
status = "running"

Jjcheese hi guys - is there a way to repeat the workflow multiple times? for example, whe...

Matt Silverlock•4/8/25, 6:38 AM

Create a new Workflow instance from inside the current Workflow

SSuman!Yep - It is a `WorkflowInstance` and I can call `await workflow.status()`. Gett...

Matt Silverlock•4/8/25, 7:37 AM

@Diogo Ferreira @Seekerdasbatatas since I’m travelling / in transit

Ggruntlord6 Is there plans to have a template like other workers as an example?

Matt Silverlock•4/8/25, 7:53 AM

Have you seen:

npm create cloudflare@latest -- --template cloudflare/agents-starter

npm create cloudflare@latest -- --template cloudflare/agents-starter

we’ll be adding this to wrangler soon, but it’s the same template

AAdrien Hey and congrats for GA 🎉 ! Is it possible to have an in-progress state that c...

Adrien•4/8/25, 8:55 AM

Maybe storing something in KV as part of a step with the key being the workflow id, and having the

fetch

fetch

function of the workflow/worker fetch it would work

cosbgn•4/8/25, 9:03 AM

I have a platform which is something like Zapier. My user want to schedule their own CRONs. Like run this action every 5 minutes. Is this something I can do with workflows?

Ccosbgn I have a platform which is something like Zapier. My user want to schedule their...

Matt Silverlock•4/8/25, 12:41 PM

Can you describe a little more about what you're trying to do? Workflows are great for multi-step / async tasks, but aren't themselves a "task scheduler" - you can use Durable Object Alarms, the Agents SDK (and the scheduling API), or even Cron Triggers to schedule tasks - incl. Workflows.

MMatt Silverlock Have you seen: ```sh npm create cloudflare@latest -- --template cloudflare/agent...

gruntlord6•4/8/25, 1:11 PM

no I did not, I was under the impression templates were in the dashboard

MMatt Silverlock Can you describe a little more about what you're trying to do? Workflows are gre...

cosbgn•4/8/25, 1:14 PM

Pretty much say my user has a workflow like:

Search for new concerts in Rome and email me if tickets are less than 50$

Search for new concerts in Rome and email me if tickets are less than 50$

run it
```
every 6 hours
```
```
every 6 hours
```

My current system works like this: I have a single CRON which runs every minute, queries the DB for pending jobs and runs them. This works but is not really scalable. I'm thinking how I could setup a system where the user defined cron interval would be the trigger. i.e. when the user saves the workflow I create a new cron/alter/workflow/whatever which takes care of this one.

Ccosbgn Pretty much say my user has a workflow like: - `Search for new concerts in Rome...

Matt Silverlock•4/8/25, 1:37 PM

I'd consider using an Agent - e.g. an Agent for each user + the Agent schedules a ticket-search Workflow that runs the search + validates prices + reports back

Ccosbgn Pretty much say my user has a workflow like: - `Search for new concerts in Rome...

Matt Silverlock•4/8/25, 1:39 PM

This isn't the same, but it's similar: each repo is associated with an Agent -> the Agent kicks a Workflow for each PR.

In your case, it's an Agent per user, and the Workflow is for a ticket-search (instead of a PR/code review):

cosbgn•4/8/25, 1:40 PM

Yeah I'm looking at the agents api

cosbgn•4/8/25, 1:40 PM

thanks

Craig•4/8/25, 2:48 PM

Hey guys, Should I move all of my complex tasks in workers into workflows? so far it seems like it doesn’t have that much disadvantages aside from being a little bit complicated.

CCraig Hey guys, Should I move all of my complex tasks in workers into workflows? so fa...

gruntlord6•4/8/25, 3:08 PM

workflows seem a lot more streamlined an maintainable then doing the tasks independently, especially if they involve multiple workers or services.

theres also some things unique like the r2 trigger that could be really usefull on its own

gruntlord6•4/8/25, 3:09 PM

I'm going to try and move one of my pipeline systems over and see how it goes, it looks promising

Ggruntlord6 workflows seem a lot more streamlined an maintainable then doing the tasks indep...

Craig•4/8/25, 3:11 PM

Yeah, that’s really attempting

gruntlord6•4/8/25, 3:11 PM

thats why I am glad theres a template as a starting point , give me something to start with and migrate over the pieces

MMatt Silverlock @Diogo Ferreira @Seekerdasbatatas since I’m travelling / in transit

Suman!OP•4/8/25, 4:03 PM

Hi, I've added a reproduction repo in this issue - https://github.com/cloudflare/workers-sdk/issues/8850

GitHub

workflow.sendEvent is not a function error in production – works ...

Which Cloudflare product(s) does this pertain to? Other What versions & operating system are you using? wrangler v4.9.0 Please provide a link to a minimal reproduction https://github.com/Suman0...

hugo martins•4/8/25, 8:08 PM

Hello, is there any way to start multiple different workflows in batch ( using only one request ) I know we can start multiple invocation of the same workflow using the createBatch but IDK about different ones

gruntlord6•4/8/25, 8:24 PM

as in a workflow invoking another workflow?

hugo martins•4/8/25, 8:58 PM

a worker invoking multiple workflows at the same time

gruntlord6•4/8/25, 11:28 PM

I haven't dug into it yet but you could just have it invoke the triggers for each right?

Hhugo martins Hello, is there any way to start multiple different workflows in batch ( using o...

Matt Silverlock•4/9/25, 6:01 AM

Call .create.create as needed for each Workflow.

SSuman!Hi, I've added a reproduction repo in this issue - https://github.com/cloudflare...

Diogo Ferreira•4/9/25, 10:43 AM

HI! Sorry for the inconvenience. Our edge runtime update that brings support for

instance.sendEvent

instance.sendEvent

is unfortunately arriving late. It is currently in our staged release process, and should be out very soon. It will make an announcement here once it fully propagated.

ddsgadget•4/9/25, 10:52 AM

Is workflows now out of beta? OK to use in production?

James•4/9/25, 12:04 PM

Yes! https://blog.cloudflare.com/workflows-ga-production-ready-durable-execution/

The Cloudflare Blog

Cloudflare Workflows is now GA: production-ready durable execution

Workflows — a durable execution engine built directly on top of Workers — is now Generally Available. We’ve landed new human-in-the-loop capabilities, more scale, and more metrics: just what you need for a production-ready service.

martinklepsch•4/9/25, 3:11 PM

I'm running into a somewhat frustrating auth error when trying to trigger or list workflows via the cloudflarecloudflare npm package …

martinklepsch•4/9/25, 3:57 PM

Somewhat related to the above, is logging from workflows captured in the worker logs?

I have this in wrangler.jsoncwrangler.jsonc

  "observability": {
    "enabled": true,
    "head_sampling_rate": 1
  }

  "observability": {
    "enabled": true,
    "head_sampling_rate": 1
  }

Jadugar_Jaggu•4/9/25, 4:49 PM

Hey, I think there might be a bug with Cloudflare Workers.
Whenever I update any binding (like a KV namespace) from the dashboard and deploy the changes, the binding for the Workflow gets removed automatically. This seems unintended and could cause issues during deployment.

Jadugar_Jaggu•4/9/25, 4:51 PM

this is happening after the GA of workflow

JJadugar_Jaggu Hey, I think there might be a bug with Cloudflare Workers. Whenever I update any...

Matt Silverlock•4/9/25, 5:20 PM

If you are mixing the dashboard + wrangler you can run into conditions like this - strongly recommend using one model to deploy. cc @Sid Chatterjee if we can make sure Workflows bindings stick here.

MMatt Silverlock If you are mixing the dashboard + wrangler you can run into conditions like this...

Jadugar_Jaggu•4/9/25, 5:22 PM

but what if I am out of my work station and I need to urgently update some Vars, secrets etc. first thought will be to use dashboard from mobile.

JulianD•4/9/25, 11:42 PM

hey guys how do I reduce my storage metric in workflows? I see that I have over 5GB of storage used (!!) and I do not need this but I don't see any option to delete old instances or even configure the workflow API to set a smaller retention period. Any ideas?

ccarse•4/10/25, 3:12 AM

So I'm building a tool that runs a workflow when a file gets placed in an r2 bucket. All working well. I'm trying to build a dashboard to show the upload events, trigger retries, etc.. The problem I'm running into is that env.WORKFLOW.get(<instanceId>) doesn't work for me in dev. Is this intended?

JJulianD hey guys how do I reduce my storage metric in workflows? I see that I have over ...

Matt Silverlock•4/10/25, 5:25 AM

This will be landing soon, but we don’t yet charge for storage.

Cccarse So I'm building a tool that runs a workflow when a file gets placed in an r2 buc...

Matt Silverlock•4/10/25, 5:26 AM

Can you show the code, and what does “doesn’t work” mean - what is the error message? What version of wrangler?

MMatt Silverlock Can you show the code, and what does “doesn’t work” mean - what is the error mes...

ccarse•4/10/25, 5:27 AM

I just updated wrangler to latest. The code snippet I posted just returns null when running locally.

Hey guys, I am getting an error when using this new Workflow API sendEvent in the production environ

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