Magento 2 - How to get quote shipping method in knockout js?

In Magento 2 I try to get shipping method in this js file : vendor/magento/module-checkout/view/frontend/web/template/billing-address.html

I try this :

quote.shippingMethod()['method_code'];

And I have this error :

Uncaught TypeError: Cannot read property 'method_code' of null

But when I console.log(quote); I can see shippingMethod method code exist:

Do you have any idea how can I get shipping method attributes here ?

Thank you

EDIT

My goal is to change data-bind in this file : /vendor/magento/module-checkout/view/frontend/web/template/billing-address.html

<fieldset class="fieldset" data-bind="visible: !isAddressDetailsVisible()">

In order that isAddressDetailsVisible() method return false if current shipping method is "colissimo pickup".

quote.shippingMethod().method_code

if (quote.shippingMethod() != undefined) {
    quote.shippingMethod().method_code
}

quote.shippingMethod.subscribe(function (method) {
    if (method.method_code == 'your_method_code') {
        this.isAddressDetailsVisible(true);
    }
}, this);