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docs: remove section on callbacks and accessor bindings #10750

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docs: remove section on callbacks and accessor bindings #10750

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45 changes: 0 additions & 45 deletions sites/svelte-5-preview/src/routes/docs/content/01-api/02-runes.md
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Expand Up @@ -312,51 312,6 @@ This also applies to more complex calculations that require more than a simple e
</script>
```

When reacting to a state change and writing to a different state as a result, think about if it's possible to use callback props instead.

```svelte
<!-- Don't do this -->
<script>
let value = $state();
let value_uppercase = $state();
$effect(() => {
value_uppercase = value.toUpperCase();
});
</script>

<Text bind:value />

<!-- Do this instead: -->
<script>
let value = $state();
let value_uppercase = $state();
function onValueChange(new_text) {
value = new_text;
value_uppercase = new_text.toUpperCase();
}
</script>

<Text {value} {onValueChange}>
```

If you want to have something update from above but also modify it from below (i.e. you want some kind of "writable `$derived`"), and events aren't an option, you can also use an object with getters and setters.

```svelte
<script>
let { value } = $props();
let facade = {
get value() {
return value.toUpperCase();
},
set value(val) {
value = val.toLowerCase();
}
};
</script>

<input bind:value={facade.value} />
```

If you absolutely have to update `$state` within an effect and run into an infinite loop because you read and write to the same `$state`, use [untrack](functions#untrack).

### What this replaces
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