import { DeviceState } from "../api/response";
import { Nullable } from "homebridge";
export declare class Cache {
    private value?;
    private validUntil;
    get valid(): boolean;
    set(data: DeviceState): void;
    renew(): void;
    merge(data: DeviceState): void;
    /**
     *
     * @param always - return the cache even if cache is not valid
     */
    get(always?: boolean): Nullable<DeviceState>;
    private static getCurrentEpoch;
}
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