main function, watch, breakpoints, scope, and the call stack:

// Main function
function main() {
    // Initialize a variable in the global scope
    let globalVariable = 10;

    // Create a new thread to perform asynchronous tasks
    const asyncThread = new Worker('asyncWorker.js');

    // Set a watch on a variable for debugging purposes
    console.log('Watching globalVariable:', globalVariable);

    // Set a breakpoint for debugging
    debugger;

    // Modify the global variable
    globalVariable = 20;

    // Call a function that involves a local scope
    function localScopeFunction() {
        let localVariable = 5;

        // Use the local variable
        console.log('Local variable:', localVariable);
    }

    localScopeFunction();

    // Display the modified global variable
    console.log('Modified globalVariable:', globalVariable);

    // Access the call stack
    displayCallStack();
}

// Function to display the call stack
function displayCallStack() {
    const callStack = new Error().stack;
    console.log('Call Stack:', callStack);
}

// Execute the main function
main();