import type { Device, DeviceChannel, DeviceHealth } from "./types.js";
/**
 * Assess the health of a device based on its state and channel data.
 *
 * Checks for stale readings, low battery, and offline status, returning
 * a summary with the worst severity as the overall health level.
 *
 * @param device - The device to assess.
 * @param channels - The device's channel readings (used for timestamp comparison).
 * @param now - Optional current time for testability (defaults to `new Date()`).
 */
export declare function assessDeviceHealth(device: Device, channels: DeviceChannel[], now?: Date): DeviceHealth;
/**
 * Check whether a channel reading is considered stale.
 *
 * @param channel - The channel to check.
 * @param now - Optional current time for testability.
 * @returns `true` if the channel's last reading is older than 5 minutes.
 */
export declare function isChannelStale(channel: DeviceChannel, now?: Date): boolean;
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