I would like to inherit  a javascript method to update some information on website page. I have tried all the ways I could but didn't work any. Most suprisingly I can't even access the object (probably itsn't considered object). If not considered object then what's the way to inherit such functions? link to the method

var delivery = require('website_sale_delivery.checkout'); // gives undefined why so? 
I am sure its not dependency issue. 
Dependencies are okay and nothing wrong on console

'use strict';
odoo.define('website_sale_delivery.checkout', function (require) {

    require('web.dom_ready');
    var ajax = require('web.ajax');

    /* Handle interactive carrier choice + cart update */
    var $pay_button = $('#o_payment_form_pay');

    var _onCarrierUpdateAnswer = function(result) {
        var $amount_delivery = $('#order_delivery span.oe_currency_value');
        var $amount_untaxed = $('#order_total_untaxed span.oe_currency_value');
        var $amount_tax = $('#order_total_taxes span.oe_currency_value');
        var $amount_total = $('#order_total span.oe_currency_value');
        var $carrier_badge = $('#delivery_carrier input[name="delivery_type"][value=' + result.carrier_id + '] ~ .badge.hidden');
        var $compute_badge = $('#delivery_carrier input[name="delivery_type"][value=' + result.carrier_id + '] ~ .o_delivery_compute');
        if (result.status === true) {
            $amount_delivery.text(result.new_amount_delivery);
            console.log("deliverystandard...........",$amount_delivery);
            $amount_untaxed.text(result.new_amount_untaxed);
            $amount_tax.text(result.new_amount_tax);
            $amount_total.text(result.new_amount_total);
            $carrier_badge.children('span').text(result.new_amount_delivery);
            $carrier_badge.removeClass('hidden');
            $compute_badge.addClass('hidden');
            $pay_button.prop('disabled', false);
        }
        else {
            console.error(result.error_message);
            $compute_badge.text(result.error_message);
        }
    };
});