/**
 * Push device token persistence — file-based storage only, no network.
 */
export interface DeviceToken {
    deviceId: string;
    pushToken: string;
    platform: "ios" | "android";
    sandbox?: boolean;
    sendKey?: string;
    registeredAt: string;
}
export declare function loadTokens(): DeviceToken[];
export declare function saveTokens(tokens: DeviceToken[]): void;
export declare function registerToken(token: DeviceToken): void;
export declare function unregisterToken(deviceId: string): boolean;