LinkError: WebAssembly.instantiate(): Import #16 "wasi_snapshot_preview1" "fd_prestat_get": function import requires a callable

[SksOp]

I am implementing a simple wrapper of cel-go that can run in browser.
First I was using go, which worked just fine in terms of logic. However as soon as I moved from go to tinygo in order to optimise the file size of wasm.
I ran into this issue that I do not understand

 LinkError: WebAssembly.instantiate(): Import #16 "wasi_snapshot_preview1" "fd_prestat_get": function import requires a callable

An example reproducible function for v0.39.0

import (
	celgo "github.com/google/cel-go/cel"
)

func CanRun(expression string) bool {
	// Create a basic CEL environment for syntax checking
	env, err := celgo.NewEnv()
	if err != nil {
		return false
	}

	// Try to parse and check the expression
	_, issues := env.Parse(expression)
	if issues != nil && issues.Err() != nil {
		return false // Invalid syntax, but not an internal error
	}

	return true
}

I would like to know is this a problem with tinygo, a limitation or is there something missing in worker_exec.js . Is there any workaround?

[aykevl]

What is the command you used to compile this code?

[SksOp]

tinygo build -o main.wasm -target wasm ./cmd/wasm/main.go

[aykevl]

Huh, interesting. We don't call this function in TinyGo itself, but we do support CGo and use wasi-libc as a C library. My guess is that this dependency uses CGo somewhere which then requires that import.

Not sure whether this is something we need to fix in TinyGo, or whether the answer is "don't use CGo".