Interface WebSocket extends EventTarget { /**

Question

Interface WebSocket extends EventTarget { /**

* Returns a string that indicates how binary data from the WebSocket object is exposed to scripts:
*
* Can be set, to change how binary data is returned. The default is "blob".
*/
binaryType: BinaryType;
/**
* Returns the number of bytes of application data (UTF-8 text and binary data) that have been queued using send() but not yet been transmitted to the network.
*
* If the WebSocket connection is closed, this attribute's value will only increase with each call to the send() method. (The number does not reset to zero once the connection closes.)
*/
readonly bufferedAmount: number;
/**
* Returns the extensions selected by the server, if any.
*/
readonly extensions: string;
onclose: ((this: WebSocket, ev: CloseEvent) => any) | null;
onerror: ((this: WebSocket, ev: Event) => any) | null;
onmessage: ((this: WebSocket, ev: MessageEvent) => any) | null;
onopen: ((this: WebSocket, ev: Event) => any) | null;
/**
* Returns the subprotocol selected by the server, if any. It can be used in conjunction with the array form of the constructor's second argument to perform subprotocol negotiation.
*/
readonly protocol: string;
/**
* Returns the state of the WebSocket object's connection. It can have the values described below.
*/
readonly readyState: number;
/**
* Returns the URL that was used to establish the WebSocket connection.
*/
readonly url: string;
/**
* Closes the WebSocket connection, optionally using code as the the WebSocket connection close code and reason as the the WebSocket connection close reason.
*/
close(code?: number, reason?: string): void;
/**
* Transmits data using the WebSocket connection. data can be a string, a Blob, an ArrayBuffer, or an ArrayBufferView.
*/
send(data: string | ArrayBufferLike | Blob | ArrayBufferView): void;
readonly CLOSED: number;
readonly CLOSING: number;
readonly CONNECTING: number;
readonly OPEN: number;
addEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
removeEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
}