Doesn't work in browser

[Gábor Kriskó]

Here is my code:

import { Buffer } from 'buffer'
window.Buffer = Buffer;

import { init, WASI } from '@wasmer/wasi';

await init();

let wasi = new WASI({
  env: {
      // 'ENVVAR1': '1',
      // 'ENVVAR2': '2'
  },
  args: [
    'command', 'arg1', 'arg2'
  ],
});

async function wasiTest(){
    const moduleBytes = fetch("/cowsay.wasm");
    const module = await WebAssembly.compileStreaming(moduleBytes);
    // Instantiate the WASI module
    await wasi.instantiate(module, {});

    // Run the start function
    let exitCode = wasi.start();
    let stdout = wasi.getStdoutString();

    // This should print "hello world (exit code: 0)"
    console.log(`${stdout}(exit code: ${exitCode})`);
}

When I call wasiTest I get the following error:

Uncaught (in promise) Error: Failed to instantiate WASI: RuntimeError: `
    at B2.wbg.__wbg_new_342a24ca698edd87 (Library.esm.min.js:25:11051)
    at 0024ee5a:0x7c9d3
    at 0024ee5a:0x19d5a
    at s.instantiate (Library.esm.min.js:25:6746)
    at wasiTest (GlobalState.js?t=1653754911321:26:16)

[Gábor Kriskó]

Update: It seems to work in firefox

[Gábor Kriskó]

TLDR: Move your code to a worker thread

I figured it out

I found a similar issue to mine: #286 (comment)

Which led me to this issue: #302

I downloaded and built HarukaMa's version and it threw this error message:

Then I moved my code into a worker and it magically worked. Turns out there's no issue with the library after all it's just that it fails to give a helpful error message that I have to use workers

[Shachar Itzhaky]

I would comment that the loss of the original error string is a bug. It even looks like something was supposed to be there: there is an extra tick after RuntimeError:. WDYT, can someone look at the code throwing the error perhaps? Might be a simple typo.

[Hamad Binqali]

TLDR: Move your code to a worker thread

I figured it out

I found a similar issue to mine: #286 (comment)

Which led me to this issue: wasmerio/wasmer-js#302 (comment)

I downloaded and built HarukaMa's version and it threw this error message:

Then I moved my code into a worker and it magically worked. Turns out there's no issue with the library after all it's just that it fails to give a helpful error message that I have to use workers

Could you put any example or code snippet, about how you actually move it to Worker?