Deno•3y ago

How can I replace writeAllSync with the Streams API?

How would one best refactor the following code to use the Web Streams API as suggested by the deprecated stdlib streams module? I was hoping to not have to change this to async for now.

writeAllSync(Deno.stdout, this.encoder.encode(msg));

writeAllSync(Deno.stdout, this.encoder.encode(msg));

Deno AI Helper•11/11/23, 1:29 PM

The function is deprecated and the documentation recommends using from instead. However, you mentioned that you want to use the Web Streams API and keep the operation synchronous.

Unfortunately, the Web Streams API is inherently asynchronous, and there isn't a direct synchronous equivalent in the API. This is because streams are designed to handle data that might not be immediately available, and to not block the main execution thread while waiting for data.

If you want to use the Web Streams API, you would need to refactor your code to be asynchronous. Here's an example of how you could do that:

In this example, is used to create a Deno writer from the returned by . Then, is used to write the encoded message to the writer. Note that this code is asynchronous and needs to be used in an async function or with a top-level

await

await

.

If you need to keep your code synchronous, you might want to stick with until it's removed, or refactor your code to support asynchronous operations.

Helpful Links:
Deno.writeAllSync | Runtime APIs | Deno
Deno 1.7 Release Notes
A list of every web API in Deno
Deno.writeAll | Runtime APIs | Deno