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✏️ Editing: on.js

import { debounce } from './debounce'
import { throttle } from './throttle'

export default function on (el, event, modifiers, callback) {
    let listenerTarget = el

let handler = e => callback(e)

let options = {}

// This little helper allows us to add functionality to the listener's
    // handler more flexibly in a "middleware" style.
    let wrapHandler = (callback, wrapper) => (e) => wrapper(callback, e)

if (modifiers.includes("dot")) event = dotSyntax(event)
    if (modifiers.includes('camel')) event = camelCase(event)
    if (modifiers.includes('passive')) options.passive = true
    if (modifiers.includes('capture')) options.capture = true
    if (modifiers.includes('window')) listenerTarget = window
    if (modifiers.includes('document')) listenerTarget = document

// By wrapping the handler with debounce & throttle first, we ensure that the wrapping logic itself is not
    // throttled/debounced, only the user's callback is. This way, if the user expects
    // `e.preventDefault()` to happen, it'll still happen even if their callback gets throttled.
    if (modifiers.includes('debounce')) {
        let nextModifier = modifiers[modifiers.indexOf('debounce')+1] || 'invalid-wait'
        let wait = isNumeric(nextModifier.split('ms')[0]) ? Number(nextModifier.split('ms')[0]) : 250

handler = debounce(handler, wait)
    }
    if (modifiers.includes('throttle')) {
        let nextModifier = modifiers[modifiers.indexOf('throttle')+1] || 'invalid-wait'
        let wait = isNumeric(nextModifier.split('ms')[0]) ? Number(nextModifier.split('ms')[0]) : 250

handler = throttle(handler, wait)
    }

if (modifiers.includes('prevent')) handler = wrapHandler(handler, (next, e) => { e.preventDefault(); next(e) })
    if (modifiers.includes('stop')) handler = wrapHandler(handler, (next, e) => { e.stopPropagation(); next(e) })

if (modifiers.includes("once")) {
        handler = wrapHandler(handler, (next, e) => {
            next(e);

listenerTarget.removeEventListener(event, handler, options);
        });
    }

if (modifiers.includes('away') || modifiers.includes('outside')) {
        listenerTarget = document

handler = wrapHandler(handler, (next, e) => {
            if (el.contains(e.target)) return

if (e.target.isConnected === false) return

if (el.offsetWidth < 1 && el.offsetHeight < 1) return

// Additional check for special implementations like x-collapse
            // where the element doesn't have display: none
            if (el._x_isShown === false) return

next(e)
        })
    }

if (modifiers.includes('self')) handler = wrapHandler(handler, (next, e) => { e.target === el && next(e) })

// Flush any pending model updates before submit handlers run
    // (e.g. x-model.blur inputs that haven't synced yet).
    if (event === 'submit') {
        handler = wrapHandler(handler, (next, e) => {
            if (e.target._x_pendingModelUpdates) {
                e.target._x_pendingModelUpdates.forEach(fn => fn())
            }

next(e)
        })
    }

// Handle :keydown and :keyup listeners.
    // Handle :click and :auxclick listeners.
    if (isKeyEvent(event) || isClickEvent(event)) {
        handler = wrapHandler(handler, (next, e) => {
            if (isListeningForASpecificKeyThatHasntBeenPressed(e, modifiers)) {
                return
            }
            
            next(e)
        })
    }

listenerTarget.addEventListener(event, handler, options)

return () => {
        listenerTarget.removeEventListener(event, handler, options)
    }
}

function dotSyntax(subject) {
    return subject.replace(/-/g, ".")
}

function camelCase(subject) {
    return subject.toLowerCase().replace(/-(\w)/g, (match, char) => char.toUpperCase())
}

function isNumeric(subject){
    return ! Array.isArray(subject) && ! isNaN(subject)
}

function kebabCase(subject) {
    if ([' ','_'].includes(subject
    )) return subject
    return subject.replace(/([a-z])([A-Z])/g, '$1-$2').replace(/[_\s]/, '-').toLowerCase()
}

function isKeyEvent(event) {
    return ['keydown', 'keyup'].includes(event)
}

function isClickEvent(event) {
    return ['contextmenu','click','mouse'].some(i => event.includes(i))
}

function isListeningForASpecificKeyThatHasntBeenPressed(e, modifiers) {
    let keyModifiers = modifiers.filter(i => {
        // `preserve-scroll` is specifically for Livewire and is not used by Alpine...
        // `blur`, `change`, `enter`, `lazy` are x-model event trigger modifiers, not key modifiers
        return ! ['window', 'document', 'prevent', 'stop', 'once', 'capture', 'self', 'away', 'outside', 'passive', 'preserve-scroll', 'blur', 'change', 'lazy'].includes(i)
    })

if (keyModifiers.includes('debounce')) {
        let debounceIndex = keyModifiers.indexOf('debounce')
        keyModifiers.splice(debounceIndex, isNumeric((keyModifiers[debounceIndex+1] || 'invalid-wait').split('ms')[0]) ? 2 : 1)
    }

if (keyModifiers.includes('throttle')) {
        let debounceIndex = keyModifiers.indexOf('throttle')
        keyModifiers.splice(debounceIndex, isNumeric((keyModifiers[debounceIndex+1] || 'invalid-wait').split('ms')[0]) ? 2 : 1)
    }

// If no modifier is specified, we'll call it a press.
    if (keyModifiers.length === 0) return false

// If one is passed, AND it matches the key pressed, we'll call it a press.
    if (keyModifiers.length === 1 && keyToModifiers(e.key).includes(keyModifiers[0])) return false

// The user is listening for key combinations.
    const systemKeyModifiers = ['ctrl', 'shift', 'alt', 'meta', 'cmd', 'super']
    const selectedSystemKeyModifiers = systemKeyModifiers.filter(modifier => keyModifiers.includes(modifier))

keyModifiers = keyModifiers.filter(i => ! selectedSystemKeyModifiers.includes(i))

if (selectedSystemKeyModifiers.length > 0) {
        const activelyPressedKeyModifiers = selectedSystemKeyModifiers.filter(modifier => {
            // Alias "cmd" and "super" to "meta"
            if (modifier === 'cmd' || modifier === 'super') modifier = 'meta'

return e[`${modifier}Key`]
        })

// If all the modifiers selected are pressed, ...
        if (activelyPressedKeyModifiers.length === selectedSystemKeyModifiers.length) {

// AND the event is a click. It's a pass.
            if (isClickEvent(e.type)) return false

// OR the remaining key is pressed as well. It's a press.
            if (keyToModifiers(e.key).includes(keyModifiers[0])) return false
        }
    }

// We'll call it NOT a valid keypress.
    return true
}

function keyToModifiers(key) {
    if (! key) return []

key = kebabCase(key)

let modifierToKeyMap = {
        'ctrl': 'control',
        'slash': '/',
        'space': ' ',
        'spacebar': ' ',
        'cmd': 'meta',
        'esc': 'escape',
        'up': 'arrow-up',
        'down': 'arrow-down',
        'left': 'arrow-left',
        'right': 'arrow-right',
        'period': '.',
        'comma': ',',
        'equal': '=',
        'minus': '-',
        'underscore': '_',
    }

modifierToKeyMap[key] = key

return Object.keys(modifierToKeyMap).map(modifier => {
        if (modifierToKeyMap[modifier] === key) return modifier
    }).filter(modifier => modifier)
}

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