How do I include a loop to allow the user to continue using JavaScript calculator until they choose to exit?

I have created a JavaScript simple calculator using the ‘readline-sync’ library for Node.js to handle terminal input/output. The calculator asks the user which operation they would like to perform (+, -, *, /). After they have selected an operation, it asks for two numbers. It performs the calculation and displays the result e.g. 45+9 = 54. After it displays the result, it should ask if the user wants to perform another calculation. How do I add a loop to allow the user to continue using the calculator until they choose to exit?

Here’s my code so far:

const calculator = require('readline-sync');

let operations = ['+', '-', '*', '/'];
let index = null;
let operator = null;
let firstNumber = 0;
let secondNumber = 0;

// Gets the operation question and the options
function operationQuestion(){
    operator = calculator.question("What operation would you like to perform?" 
        +'nOptions:'
        +'nAddition ('+ operations[0]+')'
         +'nSubtraction ('+ operations[1]+')'
          +'nMultiplication ('+ operations[2]+')'
           +'nDivision ('+ operations[3]+')n'
    );

    if (!operations.includes(operator)) {
        console.log("That is not a valid operation");
        operationQuestion();
    }

    // Gets the first and second number
    firstNumber = calculator.questionInt("Type the first number: ");
    secondNumber = calculator.questionInt("Type the second number: ");

    // 4 of the operations
    switch(operator) {
        case '+':
            console.log("The result of "+firstNumber + operator +secondNumber+" = "+ (firstNumber + secondNumber));
            break;
            case '-':
                console.log("The result of "+firstNumber + operator +secondNumber+" = "+ (firstNumber - secondNumber));
                break; 
                case '*':
                    console.log("The result of "+firstNumber + operator +secondNumber+" = "+ (firstNumber * secondNumber));
                    break;   
                    case '/':
                        console.log("The result of "+firstNumber + operator +secondNumber+" = "+ (firstNumber / secondNumber));
                        break;
                        default:
                            console.log("Something went wrong :(");
    }
}

// Logic
operationQuestion();

input = calculator.question("Do you want to perform another calculation?")