Idea: Generators

[stephen-dahl]

It would be awesome if when we returned a generator from a telefunc file it would wrap it in Server Sent Events

page.telefunc.ts

export async function* subscribe() {
  yield 1;
  yield 2;
  yield 3;
}

page.tsx

...
for await (const value of subscribe('test')) {
  console.log(value);
}
...

[brillout]

I wrote down my concerns about this here.

While I agree it would be nice to support real-time use cases, it's out-of-scope for now.

That said, feel free to elaborate what's the use case you have in mind for wanting generators.

Closing in favor #36.

[stephen-dahl]

I dont see the connection with #36.
This is more like a one way web socket or streaming response.
There are many use cases from sending large amounts of data without loading it all into memory to watching for server events.

for example to send back all the rows in a database table without loading the full table into the servers memory.

export async function* bigQuery() {
  const cursor = sql`select * from bigTable`.cursor()
  
  for await (const [row] of cursor) {
    yield row;
  }
}

for await (const row of bigQuery()) {
  // do something with the row
}
console.log('all rows loaded')

I saw elysia doing this and though it was a briliant way to handle streaming responses.
https://elysiajs.com/essential/handler.html#stream

side note, I really like the framework agnostic way you integrate with servers. made hooking up to elysia easy.

[stephen-dahl]

an alternative to this might be returning a stream from a normal function, but I like the generator interface better.

[brillout]

I see, make sense and I like it as well.