Passing configs from parent to iframeAPI and using them inside external_api.js

Hello There…
I’m using ifram API as below.
const options = {
roomName: ‘JitsiMeetAPIExample123’,
width: ‘100%’,
height: ‘100%’,
parentNode: document.querySelector(’#conf-container’),
customNode: document.querySelector(’#my-container’)

};
apiObj = new JitsiMeetExternalAPI(domain, options);

}

When I’m trying to access customNode in JitsiMeetExternalAPI constructor which is located in
modules\API\external\external_api.js

I cannot retrieve it.
Changes made to external_api.js
in modules\API\external\external_api.js
are not loaded after make dev in loalhost:8080/external_api.js

Correct me if I’m missing something??