import { ConnectionMetrics } from "./types";
export interface ConnectionMetricsState extends ConnectionMetrics {
    connectionOpenCount: number;
    connectionCloseCount: number;
    connectedDurationMs: number;
    reconnectingDurationMs: number;
    disconnectedDurationMs: number;
    stateEnteredAt: number | null;
    connectionStateChangedAt: number | null;
    connectedSince: number | null;
    reconnectingSince: number | null;
    disconnectedSince: number | null;
}
export declare const createInitialConnectionMetrics: (supported: boolean) => ConnectionMetricsState;
export declare const updateConnectionMetrics: (state: ConnectionMetricsState, input: {
    now: number;
    connectionState?: ConnectionMetrics["connectionState"];
    websocketState?: ConnectionMetrics["websocketState"];
    browserOnline?: boolean | null;
    transportBufferedAmountBytes?: number | null;
    lastDisconnectCode?: number | null;
    lastDisconnectReason?: string | null;
    incrementOpen?: boolean;
    incrementClose?: boolean;
}) => ConnectionMetricsState;
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