code: function getOrSetRegionKey(region) {
    const regionName = region ? region : getRegion();
    let regionKey = regionKeysByRegion.get(regionName);
    if (!regionKey) {
      regionKey = {region: regionName};
      regionKeysByRegion.set(regionName, regionKey);
    }
    return regionKey;
  }
docs: Returns the existing region key object or sets & returns a new region key object for the given region name.
  @param {string|undefined} [region] - the name of the region (defaults to current region if not defined)
  @returns {{region: string}} a region key object