import { SwiftRuntime } from "javascript-kit-swift";

import { WASI } from "@wasmer/wasi";

import { WasmFs } from "@wasmer/wasmfs";

const swift = new SwiftRuntime();

// Instantiate a new WASI Instance

const wasmFs = new WasmFs();

// Output stdout and stderr to console

const originalWriteSync = wasmFs.fs.writeSync;

wasmFs.fs.writeSync = (fd, buffer, offset, length, position) => {

const text = new TextDecoder("utf-8").decode(buffer);

// Filter out standalone "\n" added by every `print`, `console.log`

// always adds its own "\n" on top.

if (text !== "\n") {

switch (fd) {

case 1:

console.log(text);

break;

case 2:

console.error(text);

break;

}

}

return originalWriteSync(fd, buffer, offset, length, position);

};

let wasi = new WASI({

args: [],

env: {},

bindings: {

...WASI.defaultBindings,

fs: wasmFs.fs,

},

});

const startWasiTask = async () => {

// Fetch our Wasm File

const response = await fetch("JavaScriptKitExample.wasm");

const responseArrayBuffer = await response.arrayBuffer();

// Instantiate the WebAssembly file

const wasm_bytes = new Uint8Array(responseArrayBuffer).buffer;

let { instance } = await WebAssembly.instantiate(wasm_bytes, {

wasi_snapshot_preview1: wasi.wasiImport,

javascript_kit: swift.importObjects(),

});

swift.setInstance(instance);

// Start the WebAssembly WASI instance!

wasi.start(instance);

};

startWasiTask();