/** Effective connection type from Network Information API */
export type EffectiveConnectionType = "slow-2g" | "2g" | "3g" | "4g";
/** Network connection type (e.g., wifi, cellular) */
export type ConnectionType = "bluetooth" | "cellular" | "ethernet" | "mixed" | "none" | "other" | "unknown" | "wifi";
export interface NetworkState {
    /** Whether the browser is online */
    online: boolean;
    /** Effective connection type (when supported) */
    effectiveType?: EffectiveConnectionType;
    /** Estimated downlink speed in Mbps (when supported) */
    downlink?: number;
    /** Estimated round-trip time in ms (when supported) */
    rtt?: number;
    /** Whether the user has requested reduced data usage (when supported) */
    saveData?: boolean;
    /** Connection type (when supported) */
    connectionType?: ConnectionType;
}
/**
 * A Preact hook that returns the current network state, including online/offline
 * status and (when supported) connection type, downlink, RTT, and save-data preference.
 * Updates reactively when the network state changes.
 *
 * @returns The current network state object
 *
 * @example
 * ```tsx
 * function NetworkStatus() {
 *   const { online, effectiveType, saveData } = useNetworkState();
 *   return (
 *     <div>
 *       Status: {online ? 'Online' : 'Offline'}
 *       {effectiveType && ` (${effectiveType})`}
 *       {saveData && ' - Reduced data mode'}
 *     </div>
 * );
 * }
 * ```
 */
export declare function useNetworkState(): NetworkState;