Change qty script

I use a script to change the qty in the product view page and in the shopping cart page but I have a problem. when I decrease the qty instead the latest value to be 0 is -1. How I can stop the decrease button to remain on the 0 value?

require([
    'jquery'
], function ($) {
    $(document).ready(function(){
        
         /********************* Qty Holder **************************/
        $(document).on("click", ".qtyplus", function(e) {
            // Stop acting like a button
            e.preventDefault();
            // Get its current value
            var currentVal = parseInt($(this).parents('.qty-changer').find('input.input-text.qty').val());

            // If is not undefined
            if (!isNaN(currentVal)) {
                // Increment
                $(this).parents('.qty-changer').find('input.input-text.qty').val(currentVal + 1);
                $(this).parents('.qty-changer').find('.update-cart-item').show();
            } else {
                // Otherwise put a 0 there
                $(this).parents('.qty-changer').find('input.input-text.qty').val(1);
            }
        });
        // This button will decrement the value till 0
        $(document).on("click", ".qtyminus", function(e) {
            // Stop acting like a button
            e.preventDefault();
            // Get the field name
            fieldName = $(this).attr('field');
            // Get its current value
            var currentVal = parseInt($(this).parents('.qty-changer').find('input.input-text.qty').val());

            // If it isn't undefined or its greater than 0

            if (!isNaN(currentVal) && currentVal >= 0) {
                // Decrement one
                $(this).parents('.qty-changer').find('input.input-text.qty').val(currentVal - 1);
                $(this).parents('.qty-changer').find('.update-cart-item').show();
            } else {
                // Otherwise put a 0 there
                $(this).parents('.qty-changer').find('input.input-text.qty').val(1);
            }
        }); 
        
        
        $(".qtyplus").unbind('click').click(function(){
            if($(this).parent().parent().children(".control").children("input.input-text.qty").is(':enabled')){
                $(this).parent().parent().children(".control").children("input.input-text.qty").val((+$(this).parent().parent().children(".control").children("input.input-text.qty").val() + 1) || 0);
                $(this).parent().parent().children(".control").children("input.input-text.qty").trigger('change');
                $(this).focus();
            }
        });
        $(".qtyminus").unbind('click').click(function(){
            if($(this).parent().parent().children(".control").children("input.input-text.qty").is(':enabled')){
                $(this).parent().parent().children(".control").children("input.input-text.qty").val(($(this).parent().parent().children(".control").children("input.input-text.qty").val() - 1 > 0) ? ($(this).parent().parent().children(".control").children("input.input-text.qty").val() - 1) : 0);
                $(this).parent().parent().children(".control").children("input.input-text.qty").trigger('change');
                $(this).focus();
            }
        });
    });
});

Thank you