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64 lines
1.9 KiB
64 lines
1.9 KiB
var defaultIsMergeableObject = 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 cloneUnlessOtherwiseSpecified(value, options) {
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return (options.clone !== false && options.isMergeableObject(value))
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? deepmerge(emptyTarget(value), value, options)
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: value
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}
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function defaultArrayMerge(target, source, options) {
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return target.concat(source).map(function(element) {
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return cloneUnlessOtherwiseSpecified(element, options)
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})
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}
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function mergeObject(target, source, options) {
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var destination = {}
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if (options.isMergeableObject(target)) {
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Object.keys(target).forEach(function(key) {
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destination[key] = cloneUnlessOtherwiseSpecified(target[key], options)
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})
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}
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Object.keys(source).forEach(function(key) {
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if (!options.isMergeableObject(source[key]) || !target[key]) {
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destination[key] = cloneUnlessOtherwiseSpecified(source[key], options)
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} else {
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destination[key] = deepmerge(target[key], source[key], options)
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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, options) {
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options = options || {}
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options.arrayMerge = options.arrayMerge || defaultArrayMerge
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options.isMergeableObject = options.isMergeableObject || defaultIsMergeableObject
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var sourceIsArray = Array.isArray(source)
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var targetIsArray = Array.isArray(target)
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var sourceAndTargetTypesMatch = sourceIsArray === targetIsArray
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if (!sourceAndTargetTypesMatch) {
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return cloneUnlessOtherwiseSpecified(source, options)
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} else if (sourceIsArray) {
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return options.arrayMerge(target, source, options)
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} else {
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return mergeObject(target, source, options)
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}
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}
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deepmerge.all = function deepmergeAll(array, options) {
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if (!Array.isArray(array)) {
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throw new Error('first argument should be an array')
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}
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return array.reduce(function(prev, next) {
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return deepmerge(prev, next, options)
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}, {})
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}
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module.exports = deepmerge
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