You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
2.5 KiB
70 lines
2.5 KiB
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
|
|
|