parent.insertBefore(element, firstChild)
        }
    }

    public static void addBefore(Node sibling, Closure cl) {
        DomBuilder builder = new DomBuilder(sibling.ownerDocument, null)
        cl.delegate = builder
        cl.call()
        def parent = sibling.parentNode
        builder.elements.each { element ->
            parent.insertBefore(element, sibling)
        }
    }

            }
            if (elementName.equals("th")) {
                if (header == null) {
                    header = document.createElement("thead");
                    currentTable.insertBefore(header, null);
                    header.appendChild(currentRow);
                }
                nodes.push(document.createElement("td"));
                return true;
            }

from client_grants import ClientGrantsCredentialProvider

boto3.set_stream_logger('boto3.resources', logging.DEBUG)

bc_session = get_session()
bc_session.get_component('credential_provider').insert_before(
    'env',
    ClientGrantsCredentialProvider('NZLOOFRSluw9RfIkuHGqfk1HFp4a',
                                   '0Z4VTG8uJBSekn42HE40DK9vQb4a'),
)

boto3_session = Session(botocore_session=bc_session)

pkg container/list, method (*List) Front() *Element
pkg container/list, method (*List) Init() *List
pkg container/list, method (*List) InsertAfter(interface{}, *Element) *Element
pkg container/list, method (*List) InsertBefore(interface{}, *Element) *Element
pkg container/list, method (*List) Len() int
pkg container/list, method (*List) MoveToBack(*Element)
pkg container/list, method (*List) MoveToFront(*Element)