Run a wasm binary in Spidermonkey's shell

wasm-shell.js

if (scriptArgs.length < 1) {
    console.log('path to a wasm binary is required');
    quit(-1);
}

let binary = os.file.readFile(scriptArgs[0], 'binary');

// If the wasm instance expects imported functions from js, put them in here.
// let maybeImports = { std: { f: function() { }} };
let maybeImports;

let { exports } = new WebAssembly.Instance(
    new WebAssembly.Module(binary), maybeImports
);

// If the wasm module exports a function f.
exports.f();