Registers a function to be called when the given element
is destroyed.
Elements are destroyed when they are swapped during render pass, when their layer
closes, or when up.destroy() is called on the element or its container.
An alternative way to register a destructor function is to
return it from your compiler function.
Example
The code below will log a message when element exits the DOM:
let element = document.querySelector('.element')
up.destructor(element, () => console.log('Element was destroyed!'))
Reusing destructor functions
You may reuse the same destructor function for multiple element.
The destructor function is called with the element being destroyed:
let fn = (element) => console.log('Element %o was destroyed', element)
for (let element of document.querySelector('div')) {
up.destructor(fn)
}
