SvelteDate.now() as a live updating source

[ottomated]

Describe the problem

There's a lot of boilerplate required to make a $state that always refers to the current date.

Describe the proposed solution

It would be cool to be able to do this:

import { SvelteDate } from 'svelte/reactivity';

const time = $derived(
  new Date(SvelteDate.now()).toLocaleTimeString()
);

Naive REPL example

Importance

nice to have

[Conduitry]

How often would this try to update? Every millisecond? I don't know how to do this automatically in a sane way.

[ottomated]

How often would this try to update? Every millisecond? I don't know how to do this automatically in a sane way.

It would use svelte's internal requestAnimationFrame loop

[brunnerh]

Svelte does not have an update loop, it only updates the DOM when things have been changed, the change being the trigger.

[dummdidumm]

I don't think this makes sense - it would bring down performance because it would update at an insane rate, when in reality you're likely only interested in every second/minute/etc. Much better to decide the interval yourself and trigger updates at the appropriate times.

[ottomated]

Svelte does not have an update loop, it only updates the DOM when things have been changed, the change being the trigger.

Here's what I'm talking about: https://github.com/sveltejs/svelte/blob/main/packages/svelte/src/internal/client/loop.js

[brunnerh]

That is for transitions/animations.