Generate a wrapper for calling a WASI executable from JavaScript

[Michael-F-Bryan]

We want to invoke WASI executables programmatically in JavaScript.

I'm imagining each WASI executable exposing an interface like this:

import Wasi from "@wasmer/wasi";

export async function run(args: string, options?: Partial<RunOptions>): Promise<ExitStatus>;

type RunOptions = {
  wasi: Wasi,
  ...
};

type ExitStatus = {
  code: number,
}

We can reuse the @wasmer/wasi object to do things like the file system, stdin/stdout, environment variables, etc.

[Michael-F-Bryan]

Oops, #22 shouldn't have closed this ticket 😅