Spaces:
Sleeping
Sleeping
; | |
const Assert = require('./assert'); | |
const Clone = require('./clone'); | |
const Merge = require('./merge'); | |
const Utils = require('./utils'); | |
const internals = {}; | |
module.exports = function (defaults, source, options = {}) { | |
Assert(defaults && typeof defaults === 'object', 'Invalid defaults value: must be an object'); | |
Assert(!source || source === true || typeof source === 'object', 'Invalid source value: must be true, falsy or an object'); | |
Assert(typeof options === 'object', 'Invalid options: must be an object'); | |
if (!source) { // If no source, return null | |
return null; | |
} | |
if (options.shallow) { | |
return internals.applyToDefaultsWithShallow(defaults, source, options); | |
} | |
const copy = Clone(defaults); | |
if (source === true) { // If source is set to true, use defaults | |
return copy; | |
} | |
const nullOverride = options.nullOverride !== undefined ? options.nullOverride : false; | |
return Merge(copy, source, { nullOverride, mergeArrays: false }); | |
}; | |
internals.applyToDefaultsWithShallow = function (defaults, source, options) { | |
const keys = options.shallow; | |
Assert(Array.isArray(keys), 'Invalid keys'); | |
options = Object.assign({}, options); | |
options.shallow = false; | |
const copy = Clone(defaults, { shallow: keys }); | |
if (source === true) { // If source is set to true, use defaults | |
return copy; | |
} | |
const storage = Utils.store(source, keys); // Move shallow copy items to storage | |
Merge(copy, source, { mergeArrays: false, nullOverride: false }); // Deep copy the rest | |
Utils.restore(copy, source, storage); // Shallow copy the stored items and restore | |
return copy; | |
}; | |