Deno 2.1 Preview **local only**

[laktek]

You can now try Deno 2.1 locally with Supabase CLI. The goal of local preview is to identify any regressions or missing functionality before we upgrade hosted version to Deno 2.1.

The hosted version still uses Deno 1.4+, and if you deploy functions written with Deno 2.1, some of the features may not work.

UPDATE 04/09/25: hosted version is now using Deno 2.1 - https://github.com/orgs/supabase/discussions/37941

How to try

• Install Deno 2.1 or newer version on your machine (https://docs.deno.com/runtime/getting_started/installation/)

• Go to your Supabase project. cd my-supabase-project

• Open supabase/config.toml and set deno_version = 2

[edge_runtime]
deno_version = 2

• All your existing functions should work as before.

*To scaffold a new function as a Deno 2 project:

deno init --serve hello-world

• Open supabase/config.toml and add the following:

[functions.hello-world]
entrypoint = "./functions/hello-world/main.ts"

• Open supabase/functions/hello-world/main.ts and modify line 10 to:

if (url.pathname === "/hello-world") {

• Use npx supabase@beta functions serve --no-verify-jwt to start the dev server.

• Visit http://localhost:54321/functions/v1/hello-world.

• To run built-in tests, cd supabase/functions/hello-world; deno test

Please give it a try and report any bugs and feedback.

[AntonOfTheWoods]

@laktek . It seems to work ok BUT previously it also worked having a link to the main entrypoint file (--main-service) and it now appears that it doesn't. Is that something that can be overridden somehow with a deno option?

This is obviously not directly related to your SAAS Supabase offering but is a change for those of us wanting to use the open source version on Kubernetes (mounted via a configmap).

[laktek]

yeah, you can still pass --main-service to edge-runtime directly https://github.com/supabase/edge-runtime/blob/develop/cli/src/flags.rs#L102

cc: @nyannyacha

[AntonOfTheWoods]

Sorry, I was unclear. Previously when I passed a directory to --main-service that contains a link index.ts to a file in a different directory, it was working. Now it appears it doesn't (with the error I mention above). If I copy the actual file to a different directory and pass that new directory to --main-service, then the file appears to work just fine. Maybe it's related to new security stuff in deno 2?

[nyannyacha]

Hello @AntonOfTheWoods

If I'm correct, I don't think you've mentioned what error you're getting, can you describe the problem a bit more clearly?
You seem to be referring to an issue when using the edge runtime image directly, so I would recommend opening an issue in the repository.

Thanks!

[jwelmac]

When will this be available in the hosted version?

[jmcnulty611]

Also waiting..watching for.

…

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[balopat]

Deno 2 seems to solve some important problems with CA certificate handling and debugging fetch related errors - see https://github.com/orgs/supabase/discussions/36035 - I'd be curious when Deno 2 is planned to be available in the hosted Supabase?

[allanwolski]

When will this be available in the hosted version?
I need to call an API that requires authentication with a digital certificate, so I need to use Deno.createHttpClient.

[eeston]

https://github.com/orgs/supabase/discussions/36814

[allanwolski]

Thank you @eeston