Can the generated wasm be run in a browser ?

[bogdancucosel]

Hi!

First of all , great work on this.
It is not clear for me, since this is a wasi sdk, is it supposed to also be able to run in a browser ?
I tried something like:

<script>
	const importObject = {
		module: {},
		env: {
		memory: new WebAssembly.Memory({ initial: 256 }),
		}
	};
	fetch('test-wasm.wasm')
	.then(response =>
    	response.arrayBuffer())
	.then(bytes =>
    	WebAssembly.instantiate(bytes, importObject))
	.then(results => {
		const Answer = results.instance.exports.Answer;
		console.log(Answer());
	}, error => {
		console.log(error);
	});		
</script>

But I get "TypeError: WebAssembly.instantiate(): Import #0 module="wasi_snapshot_preview1" error: module is not an object or function"

Thank you very much

[Marina Sundström]

No, browsers does not implement WASI since it cannot access the host system directly.

But there are polyfills for that, replacing the functionality by invoking browser APIs - JS APIs.

[bogdancucosel]

Thanks for the answer.
I see now, so basically I would need polyfills for the functions that are imported in the compiled wasi, right ?.

Is there somewhere I could grab these polyfills ?

Thank you again

[Guilherme Bernal]

@bogdancucosel This is what you are looking for: https://github.com/wasmerio/wasmer-js

[bogdancucosel]

@lbguilherme thanks a lot, I will try it