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import { effect, release, overrideEffect } from "./reactivity"
import { initTree, isRoot } from "./lifecycle"
import { walk } from "./utils/walk"

export let isCloning = false

export function skipDuringClone(callback, fallback = () => {}) {
    return (...args) => isCloning ? fallback(...args) : callback(...args)
}

export function onlyDuringClone(callback) {
    return (...args) => isCloning && callback(...args)
}

export function interuptCrawl(callback) {
    return (...args) => isCloning || callback(...args)
}

export function clone(oldEl, newEl) {
    if (! newEl._x_dataStack) newEl._x_dataStack = oldEl._x_dataStack

isCloning = true

dontRegisterReactiveSideEffects(() => {
        cloneTree(newEl)
    })

isCloning = false
}

export function cloneTree(el) {
    let hasRunThroughFirstEl = false

let shallowWalker = (el, callback) => {
        walk(el, (el, skip) => {
            if (hasRunThroughFirstEl && isRoot(el)) return skip()

hasRunThroughFirstEl = true

callback(el, skip)
        })
    }

initTree(el, shallowWalker)
}

function dontRegisterReactiveSideEffects(callback) {
    let cache = effect

overrideEffect((callback, el) => {
        let storedEffect = cache(callback)

release(storedEffect)

return () => {}
    })

callback()

overrideEffect(cache)
}

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