cycpt•12mo ago

Rust run JS/TS

How can I embed this project into a rust application so that rust can run js ts and has runtime api For example fetch

4 Replies

cycpt•12mo ago

use deno_core can run js but can't run ts, and no runtime api

To embed a JavaScript/TypeScript runtime into a Rust application, you can use the deno_core crate. This crate allows you to create a JavaScript runtime in your Rust application. Here's a step-by-step guide based on the documentation: 1. Add Dependencies: First, you need to add the deno_core and tokio dependencies to your project. You can do this by running the following commands:

$ cargo add deno_core
$ cargo add tokio --features=full

$ cargo add deno_core
$ cargo add tokio --features=full

2. Create a JavaScript Runtime: Next, you need to create an instance of JsRuntime, which is responsible for JavaScript execution. You can do this in an asynchronous Rust function. Here's an example:

async fn run_js(file_path: &str) -> Result<(), AnyError> {
  let main_module = deno_core::resolve_path(file_path)?;
  let runjs_extension = Extension::builder("runjs")
    .ops(vec![
      op_read_file::decl(),
      op_write_file::decl(),
      op_remove_file::decl(),
      op_fetch::decl(),
    ])
    .build();

  let mut js_runtime = deno_core::JsRuntime::new(deno_core::RuntimeOptions {
    module_loader: Some(Rc::new(TsModuleLoader)),
    extensions: vec![runjs_extension],
    ..Default::default()
  });

  js_runtime.execute_script(
    &deno_core::resolve_url_or_path("./runtime.js").unwrap(),
    include_str!("./runtime.js"),
  )?;

  js_runtime.execute_module(&main_module).await?;
  js_runtime.run_event_loop().await?;
  Ok(())
}

async fn run_js(file_path: &str) -> Result<(), AnyError> {
  let main_module = deno_core::resolve_path(file_path)?;
  let runjs_extension = Extension::builder("runjs")
    .ops(vec![
      op_read_file::decl(),
      op_write_file::decl(),
      op_remove_file::decl(),
      op_fetch::decl(),
    ])
    .build();

  let mut js_runtime = deno_core::JsRuntime::new(deno_core::RuntimeOptions {
    module_loader: Some(Rc::new(TsModuleLoader)),
    extensions: vec![runjs_extension],
    ..Default::default()
  });

  js_runtime.execute_script(
    &deno_core::resolve_url_or_path("./runtime.js").unwrap(),
    include_str!("./runtime.js"),
  )?;

  js_runtime.execute_module(&main_module).await?;
  js_runtime.run_event_loop().await?;
  Ok(())
}

3. Add a Fetch API: To add a fetch API, you can create a runtime.js file that will instantiate and make the fetch object globally available. Here's an example:

((globalThis) => {
  const core = Deno.core;

  globalThis.runjs = {
    fetch: (url) => {
      return core.ops.op_fetch(url);
    },
  };
})(globalThis);

((globalThis) => {
  const core = Deno.core;

  globalThis.runjs = {
    fetch: (url) => {
      return core.ops.op_fetch(url);
    },
  };
})(globalThis);

4. **Register the Fetch

Deno AI Helper•12mo ago

API**: You need to register the fetch API in your run_js function. Here's an example: ```rust let runjs_extension = Extension::builder("runjs") .ops(vec![ op_read_file::decl(), op_write_file::decl

Helpful Links: Roll your own JavaScript runtime Roll your own JavaScript runtime, pt. 2 wasmbuild - Using Rust in Deno and Web Apps A list of every web API in Deno

cycpt•12mo ago

how like deno cli The same supports all runtime api Instead of doing it manually