Can't work with wasmer-js

[magulyas]

Issue

I can't load the py2wasm generated file with wasmer-js.

hello.py

def talk(message):
    return "Talk " + message

def main():
    print(talk("Hello World"))

if __name__ == "__main__":
    main()

Compiling

py2wasm hello.py -o myprogram.wasm

Browser side code

import { init, WASI } from '@wasmer/wasi';
async function load(){
  const moduleBytes = fetch('myprogram.wasm');
  const module = await WebAssembly.instantiateStreaming(moduleBytes); // -> Error
  await init();
  const wasi = new WASI({
    env: {  },
    args: [ ],
  });
  await wasi.instantiate(module, {});
  const exitCode = wasi.start();
  const stdout = wasi.getStdoutString();
  console.log(`${stdout}(exit code: ${exitCode})`);
}

Error (Chrome console)

Uncaught (in promise) TypeError: WebAssembly.instantiate(): Imports argument must be present and must be an object

Test with wasmer

wasmer run myprogram.wasm  
Talk Hello World

[syrusakbary]

Hey @magulyas , you should try to use @wasmer/sdk, not the deprecated @wasmer/wasi.

[magulyas]

Hi @syrusakbary, This issue is independent from @wasmer/wasi. It's coming from WebAssembly.instantiate() function.