introduce a method like $effect.evey that works on changing any reactive value and not depend on the last read value

[gchiocchio3git]

Describe the problem

Thanks for your work. We are migrating from v4 to v5 and were wondering if it would be possible to add an additional $effect.every rune to handle cases that currently work perfectly with v4 but would require a complete rewrite in v5.

An effect only depends on the values that it read the last time it ran. If a is true, changes to b will [not cause this effect to rerun]

$effect(() => {
console.log('running');

if (a || b) {
	console.log('inside if block');
}

});

we have Svelte 4 code like this :

$: {
console.log('running');

if (a || b) {
	console.log('inside if block');
}

}

and it would be nice 'inside if block' is printed at every change of a and b. This would be useful as well as save us time in migrating from v4 to v5

Describe the proposed solution

introduce the rune $effect.every force rerun on every state change which does not depend on the last read value

example:

$effect.every(() => {
console.log('running');

if (a || b) {
	console.log('inside if block');
}

});

'inside if block' is printed if a or b is changed.

Thanks!

Importance

would make my life easier

[paoloricciuti]

What's the use case for this? If a is true the result will not change even if b changes. Considering we don't want to add runes for everything and you can very easily fix this by reading b i don't think we should add this rune but i want to understand the use case.

[Conduitry]

This shouldn't be a pattern we are encouraging. If you want to have an effect re-run when any of several variables change, you can simply put references to those variables in the block, where none of them will get short-circuited away.