/**
 * Monitor battery status
 */
export declare function useBattery(): BatteryRef;
/**
 * Get battery level as percentage
 */
export declare function getBatteryLevel(): Promise<number | null>;
/**
 * Check if device is charging
 */
export declare function isCharging(): Promise<boolean | null>;
/**
 * Check if Battery API is available
 */
export declare function hasBattery(): boolean;
/**
 * useBattery - Battery Status API wrapper
 *
 * Monitor device battery status reactively.
 *
 * @example
 * ```ts
 * const battery = useBattery()
 * battery.subscribe(state => {
 *   console.log('Battery level:', state.level * 100 + '%')
 *   console.log('Charging:', state.charging)
 *   console.log('Time to full:', state.chargingTime)
 *   console.log('Time to empty:', state.dischargingTime)
 * })
 * ```
 */
export declare interface BatteryState {
  charging: boolean
  chargingTime: number
  dischargingTime: number
  level: number
}
export declare interface BatteryRef {
  get: () => BatteryState
  subscribe: (fn: (state: BatteryState) => void) => () => void
  isSupported: () => boolean
  getPercentage: () => number
  isLow: (threshold?: number) => boolean
  isCritical: () => boolean
}
