Mongoose how to write a query with if condition?

Suppose I have the following query:

post.getSpecificDateRangeJobs = function(queryData, callback) {
var matchCriteria = queryData.matchCriteria;
var currentDate = new Date();
var match = { expireDate: { $gte: new Date(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate()) } };
if (queryData.matchCriteria !== "") {
  match = {
    expireDate: { $gte: new Date(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate()) },
    $text: { $search: matchCriteria }
  };
}
var pipeline = [
  {
    $match: match
  },
  {
    $group: {
      _id: null,
      thirtyHourAgo: {
        $sum: {
          $cond: [
            {
              $gte: [
                "$publishDate",
                new Date(queryData.dateGroups.thirtyHourAgo)
              ]
            },
            1,
            0
          ]
        }
      },
      fourtyEightHourAgo: {
        $sum: {
          $cond: [
            {
              $gte: [
                "$publishDate",
                new Date(queryData.dateGroups.fourtyHourAgo)
              ]
            },
            1,
            0
          ]
        }
      },
      thirtyDaysAgo: {
        $sum: {
          $cond: [
            {
              $lte: [
                "$publishDate",
                new Date(queryData.dateGroups.oneMonthAgo)
              ]
            },
            1,
            0
          ]
        }
      }
    }
  }
];
var postsCollection = post.getDataSource().connector.collection(
    post.modelName
);
postsCollection.aggregate(pipeline, function(err, groupByRecords) {
  if (err) {
    return callback("err");
  }
  return callback(null, groupByRecords);
});
};

What i want to do is: 1- check if queryData.dateGroups.thirtyHourAgo existed and has value, then only add the relevant match clause in query (count of posts only for past 30 hour). 2- check if queryData.dateGroups.fourtyHourAgo existed, then add relevant query section (count of posts for past 30 hour, and past 48 hour ago). 3 and the same for queryData.dateGroups.oneMonthAgo (count of posts for past 30 hour, 48 hour, and past one month).

I need something like Mysql if condition to check if a variable existed and not empty then include a query clause. Is it possible to do that?

via jones