Trouble instantiating a wasm object with wasmer

[inviti8]

Summary

Trying to use wasmer to work with a wasm object compiled from Go. When using wasmer, to create the instance, it throws an error. This wasm object works for js web assembly. This is the error thrown:
` instance = Instance(module)

RuntimeError: Error while importing "go"."debug": unknown import. Expected Function(FunctionType { params: [I32], results: [] })`

Not sure of what the issue may be, so don't where to look in order to debug the issue. Any info you may have would be greatly appreciated.

Thanks much!

[ptitSeb]

Your module try to use go debug function and it's not part of the wasi standard. Did you target WASM32-WASI or something else?

What command line did you used? something like tinygo build -wasm-abi=generic -target=wasi -o main.wasm main.go?

[inviti8]

Hi, thanks for the quick response. This is the the full shell script:

# wget https://github.com/tinygo-org/tinygo/blob/v0.26.0/targets/wasm_exec.js
# build wasm module containing go functions
GOOS=js GOARCH=wasm go build -o ./dero_wallet.wasm 
# tinygo build -o main.wasm -target wasm ./main.go
sha512sum ./dero_wallet.wasm > ./sha512sums.txt

[theduke]

You are building with GOOS=js, which builds for the browser and requires a Javascript helper that provides the go.debug import.

You can build with Go for WASM, but then you will need to provide all the required interaction with the Wasm code yourself (via function exports and imports).

You can also use tinygo, which has WASI support. WASI allows you to use basic things like standard IO (stdin,out,err), file system access, etc.

You need to pick between one of those options, but building for JS will not work.

[inviti8]

Thanks for the details, much appreciated. :) I'm new to web assembly stuff.

you will need to provide all the required interaction with the Wasm code yourself (via function exports and imports)

In all honesty, not sure how to do that. Could you point me to a good example so I can wrap my head around how it works? Again much appreciated.

[Michael-F-Bryan]

Hey @inviti8, I haven't used tinygo before, but you might be able to find some resources by reading through tinygo-org/tinygo#3040.