New Merge testing

const mapContentBlocksByCmsBlockUID = function (cmsBlocks) {
  const mapByCmsBlockUID = {};
  // console.log();
  cmsBlocks.forEach((cmsItem, index) => {
    // Assigning owner
    // console.log("SONO NELL'iterazione: ", cmsItem);
    cmsItem["cmsCustomBlockPosition"] = index;

    if (!cmsItem.cmsBlockOwner) {
      cmsItem.cmsBlockOwner = getOwnerTypeByReferenceType(
        cmsItem.referenceType
      );
    }
    if (cmsItem.cmsBlockUID) {
      mapByCmsBlockUID[cmsItem.cmsBlockUID] = cmsItem;
    } else {
      cmsItem.cmsBlockUID = generateRandomCmsBlockUID();
      mapByCmsBlockUID[cmsItem.cmsBlockUID] = cmsItem;
    }

    Object.keys(cmsItem).forEach((cmsItemKey) => {
      if (Array.isArray(cmsItem[cmsItemKey])) {
        cmsItem[cmsItemKey] = mapContentBlocksByCmsBlockUID(
          cmsItem[cmsItemKey]
        );
      }
    });
  });

  return mapByCmsBlockUID;
};

const mergeContents = function (masterObj, slaveObj) {
  const mergeFirstLevel = (masterObj, slaveObj) => {
    if (!masterObj || !slaveObj) {
      return null;
    }

    const masterContent = mapContentBlocksByCmsBlockUID(
      masterObj["content"]["blocks"] || masterObj["content"]["pillars"]
    );
    const slaveContent = mapContentBlocksByCmsBlockUID(
      slaveObj["content"]["blocks"] || slaveObj["content"]["pillars"]
    );

    mergeDeepLevels(masterContent, slaveContent);

    // 'title', 'internalTitle', 'sitemapId', 'parentId' ""
    const fieldToOverrideFromHq = [];
    fieldToOverrideFromHq.forEach((key) => (slaveObj[key] = masterObj[key]));

    return slaveObj;
  };

  const mergeDeepLevels = (hqContent, dealerContent) => {
    if (!hqContent || !dealerContent) {
      return null;
    }
    const toCheckForOverride = Object.keys(hqContent);

    for (const key of toCheckForOverride) {
      // console.log('Checking key', key);
      if (isObject(hqContent[key])) {
        // console.log('HQ is object', key);
        /// hqContent[key] is an object
        if (isEmptyOrNotObject(dealerContent[key])) {
          // console.log('HQ is object and dealer is not or is empty', key);
          // Both are objects and dealer is empty
          // console.log('Overwrite 1', key);
          dealerContent[key] = { ...hqContent[key] };
        } else {
          // console.log('HQ is object and dealer is object and not empty', key);
          // Either dealer is not an object or is an empty object
          // dealerContect did not previusly containt key
          if (
            hqContent[key].isLocked === undefined &&
            hqContent.isLocked &&
            key !== "items"
          ) {
            // console.log('Overwrite 2', key);
            dealerContent[key] = { ...hqContent[key] };
          } else {
            mergeDeepLevels(hqContent[key], dealerContent[key]);
          }
        }
      } else {
        /// Is primitive
        // console.log('HQ is primitive', key);
        if (hqContent.isLocked === undefined) {
          // console.log('HqContent locked is undefined');
          dealerContent = {};
          dealerContent[key] = hqContent[key];
        }
        if (hqContent.isLocked) {
          // console.log('HQ is primitive and locked', key);
          dealerContent[key] = hqContent[key];
        }

        dealerContent.isPinned = hqContent.isPinned;
      }
    }

    if (dealerContent.items) {
      const keys = Object.keys(dealerContent.items);
      const itemsAsArray = Object.entries(dealerContent.items).map(
        ([k, v]) => v
      );
      dealerContent.items = itemsAsArray;
    }

    if (dealerContent.menuItems) {
      const keys = Object.keys(dealerContent.menuItems);
      const itemsAsArray = Object.entries(dealerContent.menuItems).map(
        ([k, v]) => v
      );
      dealerContent.menuItems = itemsAsArray;
    }
  };
  // console.log('Prima del merge: ', slaveObj);
  return mergeFirstLevel(masterObj, slaveObj);
};

const master_items = [
  {
    type: "BoxGridRow",
    cmsBlockUID: "09ea55b0-14cf-4e02-bf68-33750991f571",
    cmsBlockOwner: "hq",
    isLocked: false,
    isPinned: false,
    items: [
      {
        cmsBlockUID: "5846ac58-9c8f-4094-8ff8-5a80295dbda2",
        cmsBlockOwner: "hq",
        isLocked: true,
        isPinned: false,
        preTitle: "test-new-validate",
        title: "test-new-validate",
        subTitle: "test-new-validate",
        description: "test-new-validate",
        width: "33%",
        media: {
          landscapeBig: {
            id: "603794de41c6d945e01235d3",
          },
          portraitMedium: {
            id: "603794de41c6d945e01235d3",
          },
        },
        thronPlaylistId: "603794de41c6d945e01235d3",
        cta: null,
        ctaType: "standard",
        filterValues: {
          filter1: "",
          filter2: "",
          filter3: "",
        },
        cmsCustomBlockPosition: 0,
      },
      {
        cmsBlockUID: "8156c2e3-8657-42e3-abb7-e98c8cf38280",
        cmsBlockOwner: "hq",
        isLocked: true,
        isPinned: false,
        preTitle: "test-new-validate",
        title: "test-new-validate",
        subTitle: "test-new-validate",
        description: "test-new-validate",
        width: "33%",
        media: {
          landscapeBig: {
            id: "603794de41c6d945e01235d3",
          },
          portraitMedium: {
            id: "603794de41c6d945e01235d3",
          },
        },
        thronPlaylistId: "603794de41c6d945e01235d3",
        cta: null,
        ctaType: "standard",
        filterValues: {
          filter1: "",
          filter2: "",
          filter3: "",
        },
        cmsCustomBlockPosition: 1,
      },
    ],
    cmsCustomBlockPosition: 0,
  },
];

const slave_items = [
  {
    type: "BoxGridRow",
    cmsBlockUID: "09ea55b0-14cf-4e02-bf68-33750991f571",
    cmsBlockOwner: "hq",
    isLocked: false,
    isPinned: false,
    items: [
      {
        cmsBlockUID: "5846ac58-9c8f-4094-8ff8-5a80295dbda2",
        cmsBlockOwner: "hq",
        isLocked: true,
        isPinned: false,
        preTitle: "test-new-validate-NOTHERE",
        title: "test-new-validate",
        subTitle: "test-new-validate",
        description: "test-new-validate",
        width: "33%",
        media: {
          landscapeBig: {
            id: "603794de41c6d945e01235d3",
          },
          portraitMedium: {
            id: "603794de41c6d945e01235d3",
          },
        },
        thronPlaylistId: "603794de41c6d945e01235d3",
        cta: null,
        ctaType: "standard",
        filterValues: {
          filter1: "",
          filter2: "",
          filter3: "",
        },
        cmsCustomBlockPosition: 0,
      },
      {
        cmsBlockUID: "8156c2e3-8657-42e3-abb7-e98c8cf38280",
        cmsBlockOwner: "hq",
        isLocked: false,
        isPinned: false,
        preTitle: "test-new-validate",
        title: "test-new-validate-YESHERE",
        subTitle: "test-new-validate",
        description: "test-new-validate",
        width: "33%",
        media: {
          landscapeBig: {
            id: "603794de41c6d945e01235d3",
          },
          portraitMedium: {
            id: "603794de41c6d945e01235d3",
          },
        },
        thronPlaylistId: "603794de41c6d945e01235d3",
        cta: null,
        ctaType: "standard",
        filterValues: {
          filter1: "",
          filter2: "",
          filter3: "",
        },
        cmsCustomBlockPosition: 1,
      },
    ],
    cmsCustomBlockPosition: 0,
  },
];

const master = {
  _id: "605dbb1614600dfa17334244",
  reference: null,
  isHiddenFromSitemap: false,
  ignoreInheritance: false,
  isContentLocked: false,
  isCreatedByHq: true,
  sitemapId: "home-demo-SR",
  sitemapPriority: "1",
  parentId: null,
  title: "Home Demo SR",
  internalTitle: "Home Demo SR",
  locale: "en-GB",
  metadata: [
    {
      name: "robots",
      content: "index-follow",
    },
    {
      name: "description",
      content: "Home Demo SR",
    },
    {
      name: "keywords",
      content: "Home Demo SR",
    },
    {
      property: "og:title",
      content: "Home Demo SR",
    },
    {
      property: "og:type",
      content: "website",
    },
    {
      property: "og:description",
      content: "Home Demo SR",
    },
    {
      property: "og:url",
      content: "Home Demo SR",
    },
    {
      property: "og:image",
      content: "",
    },
    {
      property: "twitter:title",
      content: "Home Demo SR",
    },
    {
      property: "twitter:description",
      content: "Home Demo SR",
    },
    {
      property: "twitter:image",
      content: "",
    },
  ],
  content: {
    blocks: master_items,
  },
  slug: "Home-Demo-SR",
  status: "draft",
  publishedAt: null,
  original: "605c9631c0b66bd61c686f25",
  createdAt: "2021-03-26T10:44:38.252Z",
  updatedAt: "2021-03-26T10:44:39.421Z",
  revision: 4,
  active: true,
  ownedByDealer: "",
  referenceType: "group",
  disableEditing: false,
  selected: true,
  createdBy: "6022f67fae4c426d52e1a30b",
  expireAt: null,
};

const slave = {
  _id: "605dbb1614600dfa17334244",
  reference: null,
  isHiddenFromSitemap: false,
  ignoreInheritance: false,
  isContentLocked: false,
  isCreatedByHq: true,
  sitemapId: "home-demo-SR",
  sitemapPriority: "1",
  parentId: null,
  title: "Home Demo SR",
  internalTitle: "Home Demo SR",
  locale: "en-GB",
  metadata: [
    {
      name: "robots",
      content: "index-follow",
    },
    {
      name: "description",
      content: "Home Demo SR",
    },
    {
      name: "keywords",
      content: "Home Demo SR",
    },
    {
      property: "og:title",
      content: "Home Demo SR",
    },
    {
      property: "og:type",
      content: "website",
    },
    {
      property: "og:description",
      content: "Home Demo SR",
    },
    {
      property: "og:url",
      content: "Home Demo SR",
    },
    {
      property: "og:image",
      content: "",
    },
    {
      property: "twitter:title",
      content: "Home Demo SR",
    },
    {
      property: "twitter:description",
      content: "Home Demo SR",
    },
    {
      property: "twitter:image",
      content: "",
    },
  ],
  content: {
    blocks: slave_items,
  },
  slug: "Home-Demo-SR",
  status: "draft",
  publishedAt: null,
  original: "605c9631c0b66bd61c686f25",
  createdAt: "2021-03-26T10:44:38.252Z",
  updatedAt: "2021-03-26T10:44:39.421Z",
  revision: 4,
  active: true,
  ownedByDealer: "",
  referenceType: "group",
  disableEditing: false,
  selected: true,
  createdBy: "6022f67fae4c426d52e1a30b",
  expireAt: null,
};

const isObject = (item) => item && typeof item === "object";
const isEmptyOrNotObject = (obj) =>
  !isObject(obj) || Object.keys(obj).length === 0;

const resMerged = mergeContents(master, slave);
console.log(JSON.stringify(resMerged, null, 2));