declare interface WebSocketOpenInfo {
    readable: ReadableStream
    writable: WritableStream
    extensions: string
    protocol: string
}

declare interface WebSocketCloseInfo {
    closeCode: number
    reason: string
}

declare interface WebSocketStreamOptions {
    protocols?: string[]
    signal?: AbortSignal
}

declare class WebSocketStream {
    constructor(url: string, options?: WebSocketStreamOptions)
    readonly url: string
    readonly opened: Promise<WebSocketOpenInfo>
    readonly closed: Promise<WebSocketCloseInfo>
    close(closeInfo?: WebSocketCloseInfo): any
}