Error: Value for argument "value" is not a valid query constraint. Cannot use "undefined" as a Firestore value

Question

I am getting this error when i am exporting modules from file A and importing in file B and when i am running file B it gives that error.that is related to Firebase cloud Firestore.

const mailEvents = (startTime, endTime) => {

  serverRef = db.collection("MailEvents");
  let getDocs = serverRef
    .where("timestamp", ">=", startTime)
    .where("timestamp", "<=", endTime)
    .get()
    .then(querySnapshot => {
      if (querySnapshot) {
        let docs = querySnapshot.docs.map(doc => doc.data());
        console.log(docs)
      }
    });
}
mailEvents();
module.exports.mailEvents = mailEvents;

and the main.js file is

const module = require('./report.js')

module.mailEvents(1575225929,1575305012);

Your first bit of code is showing a function called "mailEvents", but your second bit of code is calling a function called "mailEventReports". They don't match. Please edit the question with the correct code. — Doug Stevenson
– Doug Stevenson, Commented Dec 27, 2019 at 19:36

Michael Rodriguez · Accepted Answer · 2019-12-27 19:49:17Z

The problem is that in your module, right before the export, you call the mailEvents() function without any arguments, hence the error "Cannot used "undefined" as a Firestore value" because it's trying to query the collection with startTime and endTime as undefined. In other words, each time you require this file, you're essentially calling the method twice. You can also simplify a few lines here. It should work if you change that file to this:

const mailEvents = (startTime, endTime) => {
    db.collection("MailEvents")
        .where("timestamp", ">=", startTime)
        .where("timestamp", "<=", endTime)
        .get()
        .then(querySnapshot => {
            if (querySnapshot && querySnapshot.length > 0) {
                let docs = querySnapshot.docs.map(doc => doc.data());
                console.log(docs)
            }
        });
};

module.exports = {
    mailEvents
};

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