Can the 256KB file size limit be increased to 1MB?

[thosakwe]

Hey Shopify Team,

Shopify Functions is fantastic, but, I've hit a roadblock that I believe is affecting not just me but several other developers out there.

The 256KB file size limit for Shopify Functions is a bit tight, especially when working with Rust.

Public apps often have to cover a wide variety of use cases and configurations. This presents a challenge, because if you have many configuration options, the serde crate will generate a TON of monomorphized code, which bloats the executable size.

For example, see this previous discussion about the 11M instruction count limit. My TypeScript Function keeps hitting the instruction count limit, but the file size limit is preventing me from releasing a more efficient Rust version that executes fewer instructions.

My suggestion: how about boosting the file size limit to 1 MB?

This should give developers more breathing room to create robust Shopify Functions without constantly worrying about fitting into a tight space.

I understand the need for limitations, but the current constraints seem to hinder the potential of what Shopify Functions can achieve.

I'm curious to know if others in the community share similar experiences or if there are alternative suggestions.

Looking forward to your thoughts and hopefully an expanded file size limit soon. 🙌

Best,
Tobe

[davejcameron]

We have done some significant work on improving the Rust binary size, especially with shopify_functions 0.8.0. Let me know if you are still encountering issues with the file size limit in Rust.

[nellodb]

Hi, I'm no Rust developer but as soon as I tried the Typescript road I encountered the same issues thosakwe ran into.

Our use-case envisages JWT verifications and while I'd love to get access to Shopify Network through functions, Enterprise is nowhere near our budget. I went through the tips in the https://shopify.dev/docs/apps/build/functions/programming-languages/rust-for-functions#binary-size-tips but hit the aforementioned limit pretty much immediately after installing jwt-simple = "0.12.10" and using the barebone necessities with two attributes and a verification attempt.

I'm certain a a 1 MB boost or even 512k would go a long way.

Thanks

[Sam115200]

We have done some significant work on improving the Rust binary size, especially with shopify_functions 0.8.0. Let me know if you are still encountering issues with the file size limit in Rust.

I can verify that, just by updating to shopify_functions 0.8.0, I've seen, on average, around 20KB+ binary reduction (using rust). Thank you to all the developers who made this possible, this gives us some room to breathe.

[thosakwe]

I am no longer experiencing these issues. The main contributor to binary size was the serde Rust library. I totally understand why serde produces so much code, but it's not suitable for serializing/deserializing complex structures in a WebAssembly context, where you need the smallest possible binaries.

My solution was to create a custom script that generates deserialization code. My app still uses serde_json for the actual parsing of JSON to an abstract syntax tree, but the deserialization is a ~3K line, auto-generated file that uses minimal monomorphization and produces a far smaller file. With serde, the binary was over 400KB.