Questions about embedding deno

[augustocdias]

Hello,

I have some questions about embedding deno that I couldn't find in any docs:

1. Which crate should I use: deno_core or deno_runtime?
2. Why the execute method in both runtime and core is not a future? I suppose the run_event_loop is for when I want to run something like a server written in javascript that will run indefinitely, right?
3. Is it somehow possible to have imports like in the deno manual, pointing to urls instead of local files? When I tried with the runtime it raised an error saying it wasn't a file.
4. I suppose the typescript support is not available neither in the runtime nor in the core right?

[bartlomieju]

Hello,

I have some questions about embedding deno that I couldn't find in any docs:

1. Which crate should I use: deno_core or deno_runtime?

It depends if you just need basic building blocks, or want to use APIs provided in Deno namespace; deno_runtime has implementation of most Deno APIs (sans runtime TS compiler).

2. Why the execute method in both runtime and core is not a future? I suppose the run_event_loop is for when I want to run something like a server written in javascript that will run indefinitely, right?

JsRuntime::execute is used for executing plain scripts (ie. not ES modules), execution of plain scripts is synchronous. You might want to look into JsRuntime::load_module and JsRuntime::mod_evaluate which are async and used for ES modules loading.

JsRuntime::run_event_loop is a future that resolves when there are no more async ops pending and users are expected to call it manually after executing script or module.

3. Is it somehow possible to have imports like in the deno manual, pointing to urls instead of local files? When I tried with the runtime it raised an error saying it wasn't a file.

URL import support is not part of deno_runtime crate, it's implemented in the cli directory and is currently not available to embedders.

4. I suppose the typescript support is not available neither in the runtime nor in the core right?

Correct, same story as with URL import support.

For more info, please drop by to Deno's Discord server (https://discord.gg/deno), issues are meant to be used for bug reports.

[twlite]

hi, what would be the status of this today?

[bartlomieju]

What are you asking about specifically?

[twlite]

I want to embed deno in my application. I went to deno manual but it lacks explanation about these details. After some digging, I ended up here. I was wondering what things have changed since 2021 and which of your points are same/which points have changed, etc.

[bartlomieju]

Points 3 and 4 have not changed. They are still part of the deno crate that is not available as a library and if you wish to use them you will have to implement the system yourself.