@jsonjoy.com/reactive-rpc/lib/common/channel/types.d.ts

Reactive-RPC is a library for building reactive APIs over WebSocket, HTTP, and other RPCs.

export type WebSocketBase = Pick<WebSocket, 'binaryType' | 'readyState' | 'bufferedAmount' | 'onopen' | 'onclose' | 'onerror' | 'onmessage' | 'close' | 'send'>;
export interface CloseEventBase {
    readonly code: number;
    readonly reason: string;
    readonly wasClean: boolean;
}