2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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var isMergeableObject = require('is-mergeable-object')
function emptyTarget(val) {
return Array.isArray(val) ? [] : {}
}
function cloneIfNecessary(value, optionsArgument) {
var clone = optionsArgument && optionsArgument.clone === true
return (clone && isMergeableObject(value)) ? deepmerge(emptyTarget(value), value, optionsArgument) : value
}
function defaultArrayMerge(target, source, optionsArgument) {
var destination = target.slice()
source.forEach(function(e, i) {
if (typeof destination[i] === 'undefined') {
destination[i] = cloneIfNecessary(e, optionsArgument)
} else if (isMergeableObject(e)) {
destination[i] = deepmerge(target[i], e, optionsArgument)
} else if (target.indexOf(e) === -1) {
destination.push(cloneIfNecessary(e, optionsArgument))
}
})
return destination
}
function mergeObject(target, source, optionsArgument) {
var destination = {}
if (isMergeableObject(target)) {
Object.keys(target).forEach(function(key) {
destination[key] = cloneIfNecessary(target[key], optionsArgument)
})
}
Object.keys(source).forEach(function(key) {
if (!isMergeableObject(source[key]) || !target[key]) {
destination[key] = cloneIfNecessary(source[key], optionsArgument)
} else {
destination[key] = deepmerge(target[key], source[key], optionsArgument)
}
})
return destination
}
function deepmerge(target, source, optionsArgument) {
var sourceIsArray = Array.isArray(source)
var targetIsArray = Array.isArray(target)
var options = optionsArgument || { arrayMerge: defaultArrayMerge }
var sourceAndTargetTypesMatch = sourceIsArray === targetIsArray
if (!sourceAndTargetTypesMatch) {
return cloneIfNecessary(source, optionsArgument)
} else if (sourceIsArray) {
var arrayMerge = options.arrayMerge || defaultArrayMerge
return arrayMerge(target, source, optionsArgument)
} else {
return mergeObject(target, source, optionsArgument)
}
}
deepmerge.all = function deepmergeAll(array, optionsArgument) {
if (!Array.isArray(array) || array.length < 2) {
throw new Error('first argument should be an array with at least two elements')
}
// we are sure there are at least 2 values, so it is safe to have no initial value
return array.reduce(function(prev, next) {
return deepmerge(prev, next, optionsArgument)
})
}
module.exports = deepmerge
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