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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use deno_core::anyhow::Error;use deno_core::FsModuleLoader;use deno_core::JsRuntime;use deno_core::RuntimeOptions;use std::rc::Rc;
fn main() -> Result<(), Error> {  let args: Vec<String> = std::env::args().collect();  if args.len() < 2 {    println!("Usage: target/examples/debug/fs_module_loader <path_to_module>");    std::process::exit(1);  }  let main_url = args[1].clone();  println!("Run {}", main_url);
  let mut js_runtime = JsRuntime::new(RuntimeOptions {    module_loader: Some(Rc::new(FsModuleLoader)),    ..Default::default()  });
  let runtime = tokio::runtime::Builder::new_current_thread()    .enable_all()    .build()?;
  let main_module = deno_core::resolve_path(&main_url)?;
  let future = async move {    let mod_id = js_runtime.load_main_module(&main_module, None).await?;    let result = js_runtime.mod_evaluate(mod_id);    js_runtime.run_event_loop(false).await?;    result.await?  };  runtime.block_on(future)}