Проблема, связанная с областью действия в javascript. Не могу найти способ избавиться от ошибки. Нужен другой ответ.

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I can't seem to find a way to get rid of an error. It is always "cannot read property TeamNum of undefined." I know it has something to do with scope.
Here is the code:

let myGlobalVars = {}
// sets up teams array and individual teams
let team1 = [];
myGlobalVars.team1 = team1;
let team2 = [];
myGlobalVars.team2 = team2;
let team3 = [];
myGlobalVars.team3 = team3;
let team4 = [];
myGlobalVars.team4 = team4;
let teams = [myGlobalVars.team1, myGlobalVars.team2, myGlobalVars.team3, myGlobalVars.team4];
myGlobalVars.teams = teams;
let teamNumsArray = Array.apply(null, {length: myGlobalVars.teams.length}).map(Function.call, Number);
myGlobalVars.teamNumsArray = teamNumsArray;

// function for random numbers is copied from Ben Jackson on https://stackoverflow.com/questions/18806210/generating-non-repeating-random-numbers-in-js
function shuffle(array) {
    let i = array.length,
        j = 0,
        temp;

    while (i--) {

        j = Math.floor(Math.random() * (i+1));

        // swap randomly chosen element with current element
        temp = array[i];
        array[i] = array[j];
        array[j] = temp;

    }

    return array;
}
// formula replicateArray is copied from https://stackoverflow.com/questions/30228902/duplicate-an-array-an-arbitrary-number-of-times-javascript
function replicateArray(array, n) {
  // Create an array of size "n" with undefined values
  let arrays = Array.apply(null, new Array(n)); 

  // Replace each "undefined" with our array, resulting in an array of n copies of our array
  arrays = arrays.map(function() { return array });

  // Flatten our array of arrays
  return [].concat.apply([], arrays);
}
// formula to make teamNumsArray is copied from http://www.jstips.co/en/javascript/create-range-0/.n-easily-using-one-line/

let players = [myGlobalVars.player1, myGlobalVars.player2, myGlobalVars.player3, myGlobalVars.player4, myGlobalVars.player5, myGlobalVars.player6, myGlobalVars.player7, myGlobalVars.player8]
myGlobalVars.players = players;
let ranNums = shuffle(replicateArray(myGlobalVars.teamNumsArray, (myGlobalVars.players.length/teams.length)));
myGlobalVars.ranNums = ranNums;
// sets up players
let player1 = {
  name: "A",
  teamNum: myGlobalVars.ranNums[0]
}
myGlobalVars.player1 = player1;
let player2 = {
  name: "B",
  teamNum: myGlobalVars.ranNums[1]
}
myGlobalVars.player2 = player2;
let player3 = {
  name: "C",
  teamNum: myGlobalVars.ranNums[2]
}
myGlobalVars.player3 = player3;
let player4 = {
  name: "D",
  teamNum: myGlobalVars.ranNums[3]
}
myGlobalVars.player4 = player4;
let player5 = {
  name: "E",
  teamNum: myGlobalVars.ranNums[4]
}
myGlobalVars.player5 = player5;
let player6 = {
  name: "F",
  teamNum: myGlobalVars.ranNums[5]
}
myGlobalVars.player6 = player6;
let player7 = {
  name: "G",
  teamNum: myGlobalVars.ranNums[6]
}
myGlobalVars.player7 = player7;
let player8 = {
  name: "H",
  teamNum: myGlobalVars.ranNums[7]
}
myGlobalVars.player8 = player8;
// sets up players array









function assignPlayers() {
  for (let i = 0; i < teams.length; i++) {
  for(let j = 0; j < players.length; j++) {
    if(players[j].teamNum === i) {
        teams[i].push(players[j].name)
      }
    }
  }
console.log(team1)
console.log(team2)
console.log(team3)
console.log(team4)
}
assignPlayers()

Если вы хотите поработать над этим на GitHub вот РЕПО с кодом:
РЕПО

Что я уже пробовал:

Я попытался перестроить код, чтобы избавиться от ошибок, но появлялись разные ошибки, связанные с областью действия.
Сначала я попытался создать объект, который будет содержать все объекты, которые я хотел бы использовать в любом месте кода, даже если переменная еще не была объявлена в глобальном пространстве, но это тоже не сработало. Объект, чтобы провести все глобальные переменные, называется myGlobalVars.

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