@stomp/stompjs/esm6/augment-websocket.js

/**
 * @internal
 */
export function augmentWebsocket(webSocket, debug) {
    webSocket.terminate = function () {
        const noOp = () => { };
        // set all callbacks to no op
        this.onerror = noOp;
        this.onmessage = noOp;
        this.onopen = noOp;
        const ts = new Date();
        const id = Math.random().toString().substring(2, 8); // A simulated id
        const origOnClose = this.onclose;
        // Track delay in actual closure of the socket
        this.onclose = closeEvent => {
            const delay = new Date().getTime() - ts.getTime();
            debug(`Discarded socket (#${id})  closed after ${delay}ms, with code/reason: ${closeEvent.code}/${closeEvent.reason}`);
        };
        this.close();
        origOnClose?.call(webSocket, {
            code: 4001,
            reason: `Quick discarding socket (#${id}) without waiting for the shutdown sequence.`,
            wasClean: false,
        });
    };
}
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