Where in this bundle is the actual call to "v1/swagger.json" made?

[Suamere]

Swagger UI resolves to something like this in the browser:

        window.onload = function () {
            var configObject = JSON.parse('{"urls":[{"url":"v1/swagger.json","name":"Test.API v1"}] /* etc */ }');

            configObject.urls.forEach(function (item) {
                if (item.url.startsWith("http") || item.url.startsWith("/")) return;
                item.url = window.location.href.replace("index.html", item.url).split('#')[0];
            });

            // ... etc            

            const ui = SwaggerUIBundle(configObject);

            ui.initOAuth(oauthConfigObject);

            window.ui = ui
        }

I'm finding it difficult tracking down in the SwaggerUIBundle where the HTTP call is made to that url (v1/swagger.json). Any pointers on where to find it?