How to implement Promise chains/Streams?

[adhamsalama]

I already asked a question about how to implement setInterval here at the roll-your-own-javascript-runtime because I got no reply there.

I'm generally having trouble in implementing Promise chains, like implementing the Fetch API.

In JS, you can use fetch to make a request, await it, which will return status code and headers, then you can execute something like let jsonResponse = await response.json() to get the body.

How to do that with Deno/Rust?

The tutorial implements a trivial fetch API that just fetches the entire response at once and returns it as text.

As far as I understand, that works in Node.js with Streams, but I still don't know how to bridge the gap between JS and Rust in this case.

I get that the tutorial is supposed to be simple, but it got me really interested in how I would implement this kind of stuff.

Thanks in advance.