Wasmex and wasm_bindgen: unknown import: wbg::__wbindgen_object_drop_ref has not been defined

[erszcz]

Hi,

First of all, thanks for all the effort put into making this project!

I wanted to build ywasm and run it in Elixir with Wasmex, but have run into the following issue:

iex(2)> {:ok, pid} = Wasmex.start_link(%{bytes: bytes})
** (MatchError) no match of right hand side value: {:error, "unknown import: `wbg::__wbindgen_object_drop_ref` has not been defined"}
    (stdlib 5.2.3) erl_eval.erl:498: :erl_eval.expr/6
    iex:2: (file)

I figured out I can pass in imports and provided a stub for __wbindgen_object_drop_ref:

iex(2)> {:ok, pid} = Wasmex.start_link(%{bytes: bytes, imports: %{wbg: %{:'__wbindgen_object_drop_ref' => {:fn, [:i32], [], fn _ -> :ok end}}}})
** (MatchError) no match of right hand side value: {:error, "unknown import: `wbg::__wbindgen_object_clone_ref` has not been defined"}
    (stdlib 5.2.3) erl_eval.erl:498: :erl_eval.expr/6
    iex:2: (file)

And then a few others (__wbindgen_object_clone_ref, __wbindgen_is_undefined), but this leads me to conclude that I'm doing something wrong and these functions should actually be provided by another WASM module. What would be the next steps to get this running properly (i.e. a WASM module with a dependency on wasm_bindgen)? I'd be grateful for any pointers, including external reading material, if such exists.

[munjalpatel]

@erszcz yes, from errors, it appears your target wasm is dependent on imports that are missing.

Is your target module dependent on another wasm module(s) that provides the missing functions?
If so, you'll need to dynamically link those wasm modules so that you don't have to manually specify all missing imports.

We recently added support to dynamically link external modules.
#596

[erszcz]

Aha, perfect! Thank you for the pointer, @munjalpatel, I'll dig into that thread!
I'll close the issue, since it's not really a Wasmex problem that needs addressing.