denoland-deno/core/examples/fs_module_loader.rs

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.

use anyhow::Context;
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];
  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,
    &std::env::current_dir().context("Unable to get CWD")?,
  )?;

  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)
}