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docs: mention update method on svelte-action page #15977

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1 change: 1 addition & 0 deletions documentation/docs/03-template-syntax/12-use.md
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Expand Up @@ -39,6 +39,7 @@ An action can be called with an argument:
```

The action is only called once (but not during server-side rendering) — it will _not_ run again if the argument changes.
However, the action _can_ [return an object](./svelte-action#ActionReturn) containing an `update` method that will be run when the argument changes.

> [!LEGACY]
> Prior to the `$effect` rune, actions could return an object with `update` and `destroy` methods, where `update` would be called with the latest value of the argument if it changed. Using effects is preferred.
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