WebAssembly

The runtime supports the standard WebAssembly JavaScript API - you can compile, instantiate, and run .wasm modules directly from your scripts. The engine implements the full wasi_snapshot_preview1 interface, so WASI-compatible modules work out of the box.

import fs from "@native/fs";

const bytes = fs.readFileSync("python.wasm");
const module = new WebAssembly.Module(bytes);
const instance = new WebAssembly.Instance(module);

try {
    instance.exports._start();
    console.log("python exited normally");
} catch (e) {
    if (String(e).includes("__wasi_proc_exit__"))
        console.log("python called proc_exit - ok");
    else
        console.log("python error:", String(e));
}

For a deeper dive into WebAssembly.Module, WebAssembly.Instance, imports, memory, and tables - see the MDN WebAssembly guide.

Overview

Modules

Types