export const toFlatObject = (objectArg: object) => {
  const returnObject: {[key: string]: any} = {};
  const extractLayer = (subObject: {[key: string]: any}, pathArg: string, loopProtection: object[]) => {
    if (loopProtection.indexOf(subObject) > -1) {
      return;
    }
    if (subObject)
      for (const key of Object.keys(subObject)) {
        let localPathArg = pathArg;
        if (typeof subObject[ key ] === 'object' && !(subObject[ key ] instanceof Array)) {
          const newLoopbackArray = loopProtection.slice();
          newLoopbackArray.push(subObject);
          extractLayer(subObject[ key ], localPathArg ? localPathArg += `.${key}` : key, newLoopbackArray);
        } else {
          returnObject[localPathArg ? localPathArg += `.${key}` : key] = subObject[key];
        }
      }
  }
  extractLayer(objectArg, '', []);
  return returnObject;
}