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'use strict';
const Assert = require('./assert');
const Clone = require('./clone');
const Utils = require('./utils');
const internals = {};
module.exports = internals.merge = function (target, source, options) {
Assert(target && typeof target === 'object', 'Invalid target value: must be an object');
Assert(source === null || source === undefined || typeof source === 'object', 'Invalid source value: must be null, undefined, or an object');
if (!source) {
return target;
}
options = Object.assign({ nullOverride: true, mergeArrays: true }, options);
if (Array.isArray(source)) {
Assert(Array.isArray(target), 'Cannot merge array onto an object');
if (!options.mergeArrays) {
target.length = 0; // Must not change target assignment
}
for (let i = 0; i < source.length; ++i) {
target.push(Clone(source[i], { symbols: options.symbols }));
}
return target;
}
const keys = Utils.keys(source, options);
for (let i = 0; i < keys.length; ++i) {
const key = keys[i];
if (key === '__proto__' ||
!Object.prototype.propertyIsEnumerable.call(source, key)) {
continue;
}
const value = source[key];
if (value &&
typeof value === 'object') {
if (target[key] === value) {
continue; // Can occur for shallow merges
}
if (!target[key] ||
typeof target[key] !== 'object' ||
(Array.isArray(target[key]) !== Array.isArray(value)) ||
value instanceof Date ||
(Buffer && Buffer.isBuffer(value)) || // $lab:coverage:ignore$
value instanceof RegExp) {
target[key] = Clone(value, { symbols: options.symbols });
}
else {
internals.merge(target[key], value, options);
}
}
else {
if (value !== null &&
value !== undefined) { // Explicit to preserve empty strings
target[key] = value;
}
else if (options.nullOverride) {
target[key] = value;
}
}
}
return target;
};