Using fs.readFileSync in Rust with WASM

lib.js

const fs = require('fs')

function readFile(path) {
  return fs.readFileSync(path, { encoding: 'utf8' })
} 

module.exports = {
  readFile
}

lib.rs

mod utils;

extern crate wasm_bindgen;

use wasm_bindgen::prelude::*;

#[wasm_bindgen(module = "/lib.js")]
extern "C" {
    #[wasm_bindgen(catch)]
    fn readFile(path: &str) -> Result<String, JsValue>;
}

#[wasm_bindgen]
extern "C" {
    #[wasm_bindgen(js_namespace = console)]
    fn log(s: &str);
}

macro_rules! console_log {
    ($($t:tt)*) => (log(&format_args!($($t)*).to_string()))
}

#[wasm_bindgen(start)]
pub fn start() {
    utils::set_panic_hook();

    let val: String = readFile("src/lib.rs").unwrap();

    console_log!("{}", val);
}

main.js

// Runs lib.rs
const f = require('./pkg/hello_wasm.js')