@tacky/store/lib/utils/deep-merge.js

State management framework based on react

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.deepMerge = deepMerge;

var _typeof2 = _interopRequireDefault(require("@babel/runtime/helpers/typeof"));

function isMergeableObject(val) {
  var nonNullObject = val && (0, _typeof2["default"])(val) === 'object';
  return nonNullObject && Object.prototype.toString.call(val) !== '[object RegExp]' && Object.prototype.toString.call(val) !== '[object Date]';
}

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 array = Array.isArray(source);
  var options = optionsArgument || {
    arrayMerge: defaultArrayMerge
  };
  var arrayMerge = options.arrayMerge || defaultArrayMerge;

  if (array) {
    return Array.isArray(target) ? arrayMerge(target, source, optionsArgument) : cloneIfNecessary(source, optionsArgument);
  } else {
    return mergeObject(target, source, optionsArgument);
  }
}