How to fix undefined variable in javascript

For some reason my function is not returning a 1 or 2 even though it's specifically setup to do so. What am I doing wrong? I'm looking at the chrome dev tools and it's telling me that var processed is undefined.

I'm quite stumped on this. I've been reading if it's because a variable could be used as a parameter but I'm not sure if this is the case

var processChoices = function (player, computer){
    switch (player) {
        case player == 'rock':
            if (computer == 'paper'){
                var winner = 2; 
            } else if (computer == 'scissors'){
                var winner = 1; 
            }
            break;
        case player == 'paper':
            if (computer == 'scissors'){
                var winner = 2;
            } else if (computer == 'rock'){
                var winner = 1;
            }
            break;
        case player == 'scissors':
            if (computer == 'rock'){
                var winner = 2;
            } else if (computer == 'paper'){
                var winner = 1;
            }
            break;
        default:
            if (computer == player){
        var winner = console.log('We have a tie, go again!');
            } 
            break;
    }
    return winner
}

var determineWinner = function (){
    var computer = computerPlay();
    var player = playerChoice();
    var processed = processChoices(player, computer);

    if (processed == 1){
        playerCount += 1;
    } else {
        computerCount += 1;
    }
    var message = (processed == 2) ? `The computer wins! ${computer} beats ${player}!` : `The player wins! ${player} beats ${computer}!`;
    console.log(message);

}

I'm expecting the output of var processed to be 1 or 2. It's coming back as undefined.