Clean object for firestore recursively

clean-object-for-firestore-recursively

let clean = (obj) => {
  let dateCounter = 0;

  function traverse(parent, key) {
      if (_.isDate(parent[key])) {
          parent[key] = parent[key].getTime(); //convert to timestamp
          dateCounter++;
      }

      if (_.isArray(parent[key])) {
          _.each(parent[key], function (_ob) {
              _.each(Object.keys(_ob), function (key) {
                  traverse(_ob, key)
              });
          })
      }

      if (parent[key] === undefined){
          delete parent[key]
      } else if (parent[key] === null){
          delete parent[key]
      } else if (typeof parent[key] === "object") {
          let obj = parent[key]
          let objKeys = Object.keys(obj)
          if(objKeys.length > 0) {
              _.each(objKeys, function (objKey) {                    
                  traverse(obj, objKey)
              })
          }
      }
      if (typeof parent[key] === "function") {
          delete parent[key]
      }
  }

  _.each(Object.keys(obj), function (key) {
      traverse(obj, key)
  });

  return obj;
}