declare namespace org {
    namespace eclipse {
        namespace jetty {
            namespace websocket {
                namespace client {
                    namespace io {
                        class UpgradeConnection extends org.eclipse.jetty.io.AbstractConnection implements org.eclipse.jetty.io.Connection$UpgradeFrom {
                            public constructor(arg0: org.eclipse.jetty.io.EndPoint, arg1: java.util.concurrent.Executor | java.util.concurrent.Executor$$Lambda, arg2: org.eclipse.jetty.websocket.client.io.ConnectPromise)
                            public disconnect(arg0: boolean): void
                            public onUpgradeFrom(): java.nio.ByteBuffer
                            public onFillable(): void
                            public onOpen(): void
                            public onClose(): void
                            protected onReadTimeout(): boolean
                            public static class: java.lang.Class<any>
                        }
                    }
                }
            }
        }
    }
}