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name : x-show.js
 import { evaluateLater } from '../evaluator'
import { directive } from '../directives'
import { mutateDom } from '../mutation'
import { once } from '../utils/once'

directive('show', (el, { modifiers, expression }, { effect }) => {
    let evaluate = evaluateLater(el, expression)

    // We're going to set this function on the element directly so that
    // other plugins like "Collapse" can overwrite them with their own logic.
    if (! el._x_doHide) el._x_doHide = () => {
        mutateDom(() => {
            el.style.setProperty('display', 'none', modifiers.includes('important') ? 'important' : undefined)
        })
    }

    if (! el._x_doShow) el._x_doShow = () => {
        mutateDom(() => {
            if (el.style.length === 1 && el.style.display === 'none') {
                el.removeAttribute('style')
            } else {
                el.style.removeProperty('display')
            }
        })
    }

    let hide = () => {
        el._x_doHide()
        el._x_isShown = false
    }

    let show = () => {
        el._x_doShow()
        el._x_isShown = true
    }

    // We are wrapping this function in a setTimeout here to prevent
    // a race condition from happening where elements that have a
    // @click.away always view themselves as shown on the page.
    let clickAwayCompatibleShow = () => setTimeout(show)

    let toggle = once(
        value => value ? show() : hide(),
        value => {
            if (typeof el._x_toggleAndCascadeWithTransitions === 'function') {
                el._x_toggleAndCascadeWithTransitions(el, value, show, hide)
            } else {
                value ? clickAwayCompatibleShow() : hide()
            }
        }
    )

    let oldValue
    let firstTime = true

    effect(() => evaluate(value => {
        // Let's make sure we only call this effect if the value changed.
        // This prevents "blip" transitions. (1 tick out, then in)
        if (! firstTime && value === oldValue) return

        if (modifiers.includes('immediate')) value ? clickAwayCompatibleShow() : hide()

        toggle(value)

        oldValue = value
        firstTime = false
    }))
})
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