var isMergeableObject = require('is-mergeable-object')
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function emptyTarget(val) {
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return Array.isArray(val) ? [] : {}
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}
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function cloneIfNecessary(value, optionsArgument) {
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var clone = optionsArgument && optionsArgument.clone === true
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return (clone && isMergeableObject(value)) ? deepmerge(emptyTarget(value), value, optionsArgument) : value
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}
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function defaultArrayMerge(target, source, optionsArgument) {
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var destination = target.slice()
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source.forEach(function(e, i) {
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if (typeof destination[i] === 'undefined') {
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destination[i] = cloneIfNecessary(e, optionsArgument)
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} else if (isMergeableObject(e)) {
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destination[i] = deepmerge(target[i], e, optionsArgument)
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} else if (target.indexOf(e) === -1) {
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destination.push(cloneIfNecessary(e, optionsArgument))
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}
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})
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return destination
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}
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function mergeObject(target, source, optionsArgument) {
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var destination = {}
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if (isMergeableObject(target)) {
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Object.keys(target).forEach(function(key) {
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destination[key] = cloneIfNecessary(target[key], optionsArgument)
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})
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}
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Object.keys(source).forEach(function(key) {
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if (!isMergeableObject(source[key]) || !target[key]) {
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destination[key] = cloneIfNecessary(source[key], optionsArgument)
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} else {
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destination[key] = deepmerge(target[key], source[key], optionsArgument)
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}
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})
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return destination
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}
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function deepmerge(target, source, optionsArgument) {
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var sourceIsArray = Array.isArray(source)
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var targetIsArray = Array.isArray(target)
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var options = optionsArgument || { arrayMerge: defaultArrayMerge }
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var sourceAndTargetTypesMatch = sourceIsArray === targetIsArray
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if (!sourceAndTargetTypesMatch) {
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return cloneIfNecessary(source, optionsArgument)
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} else if (sourceIsArray) {
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var arrayMerge = options.arrayMerge || defaultArrayMerge
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return arrayMerge(target, source, optionsArgument)
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} else {
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return mergeObject(target, source, optionsArgument)
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}
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}
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deepmerge.all = function deepmergeAll(array, optionsArgument) {
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if (!Array.isArray(array) || array.length < 2) {
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throw new Error('first argument should be an array with at least two elements')
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}
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// we are sure there are at least 2 values, so it is safe to have no initial value
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return array.reduce(function(prev, next) {
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return deepmerge(prev, next, optionsArgument)
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})
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}
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module.exports = deepmerge
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