Serverless Function runtime provided does not support more than 4KB for environment variables

[omerdn1]

Hello,

We're getting this error on deployment build of the rust runtime:

Serverless Function runtime provided does not support more than 4KB for environment variables

Reading through Vercel's limitation docs:
https://vercel.com/docs/projects/environment-variables#environment-variable-size

It seems that the limit should be 64kb.
In any case, we didn't get this error for our node.js serverless functions. What could be wrong here?

[dglsparsons]

Hi, nodejs has a large env support which allows it up to 64Kib. The Rust runtime does not support this and is capped at 4Kib. You may want to unselect the option 'automatically expose system env variables'. Hope this helps!

[omerdn1]

@dglsparsons Hi, is there another way we could tackle this? This option appears to be global and not runtime specific, we don't want our next.js environment to be affected by this.

Also, out of curiosity, what exactly is the reason behind this increased limit for the Rust runtime?

[dglsparsons]

Hi @omerdn1, i'm not aware of any specific way, other than having fewer environment variables or shorter commit messages.

It's not an increased limit for Rust, but instead, NodeJS has additional support allowing more environment variables.