Observe since v2.1.0effect

Observe is used to trigger side effects (like updating a UI or playing a sound) in response to state changes. Unlike Property, it does not return a value; instead, it returns a cleanup function.

Observe(effect: (use: (value: T | Value<T>) -> T, ...any) -> T) -> T, data: {[any]: any}?) -> () -> ()

Parameters

Name	Type	Description
effect	(use: (value: T | Value<T>) -> T, ...any) -> T	The side effect that gets called when one of its dependencies gets updated.
data	{[any]: any}?	Optional. External data to be passed to effect.

Returns

Type	Description
() -> ()	A cleanup function that destroys itself.