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var defaultIsMergeableObject = require('is-mergeable-object')

function emptyTarget(val) {
	return Array.isArray(val) ? [] : {}
}

function cloneUnlessOtherwiseSpecified(value, options) {
	return (options.clone !== false && options.isMergeableObject(value))
		? deepmerge(emptyTarget(value), value, options)
		: value
}

function defaultArrayMerge(target, source, options) {
	return target.concat(source).map(function(element) {
		return cloneUnlessOtherwiseSpecified(element, options)
	})
}

function mergeObject(target, source, options) {
	var destination = {}
	if (options.isMergeableObject(target)) {
		Object.keys(target).forEach(function(key) {
			destination[key] = cloneUnlessOtherwiseSpecified(target[key], options)
		})
	}
	Object.keys(source).forEach(function(key) {
		if (!options.isMergeableObject(source[key]) || !target[key]) {
			destination[key] = cloneUnlessOtherwiseSpecified(source[key], options)
		} else {
			destination[key] = deepmerge(target[key], source[key], options)
		}
	})
	return destination
}

function deepmerge(target, source, options) {
	options = options || {}
	options.arrayMerge = options.arrayMerge || defaultArrayMerge
	options.isMergeableObject = options.isMergeableObject || defaultIsMergeableObject

	var sourceIsArray = Array.isArray(source)
	var targetIsArray = Array.isArray(target)
	var sourceAndTargetTypesMatch = sourceIsArray === targetIsArray

	if (!sourceAndTargetTypesMatch) {
		return cloneUnlessOtherwiseSpecified(source, options)
	} else if (sourceIsArray) {
		return options.arrayMerge(target, source, options)
	} else {
		return mergeObject(target, source, options)
	}
}

deepmerge.all = function deepmergeAll(array, options) {
	if (!Array.isArray(array)) {
		throw new Error('first argument should be an array')
	}

	return array.reduce(function(prev, next) {
		return deepmerge(prev, next, options)
	}, {})
}

module.exports = deepmerge