Export to Firestore in AppScript

firestore.gs

function main() {
  var sheet = SpreadsheetApp.getActiveSheet();
  // This is set as the collection name
  var sheetName = sheet.getName();
  var properties = getProperties(sheet);
  var records = getData(sheet);
  var firestore = getFirestore();
  exportToFirestore(firestore, sheetName, records, properties);
}

// See setup instructions here: https://github.com/grahamearley/FirestoreGoogleAppsScript
function getFirestore() {
  return FirestoreApp.getFirestore('email', 'key', 'projectId');
}

// Get the first row and its columns - ['author', 'isbn', 'category', 'title']
function getProperties(sheet) {
  return sheet.getRange(1, 1, 1, 4).getValues()[0];
}

// Get the data in the sheet. Starts at row 2, column 1 and then goes down for 100 rows and across 4 columns.
function getData(sheet) {
  return sheet.getRange(2, 1, 100, 4).getValues()
  sheet.getRange(2, column, numRows, numColumns)
}

//  Save to Firestore.
function exportToFirestore(firestore, collectionName, records, properties) {
  var formatBook = createDataFormatter(properties);
  records.map(formatBook).forEach(function(book) {
    firestore.createDocument(collectionName, book); 
  });
}

function createDataFormatter(properties) {
  return function formatter(record, i) {
    var data = {};
    properties.forEach(function(prop, i) { data[prop] = record[i]; });
    return data; 
  }
}

function onOpen() {
  SpreadsheetApp.getUi().createMenu('🔥 Firebase').addItem('Export to Firestore', "main").addToUi();
}

zdata.csv

I can't seem to use custom document names from the spreadsheet! What can I do? I've been working on this for a week and cannot figure it out.