export declare function formatPhoneNumber(phoneNumber: string): string;
export declare function formatPhoneNumbers(phoneNumbers: string[]): string[];
export declare function calculateSMSSegments(message: string): number;
export declare function normalizePaginationParams(params: {
    page?: number;
    limit?: number;
    offset?: number;
}): Required<{
    page: number;
    limit: number;
    offset: number;
}>;
export declare function delay(ms: number): Promise<void>;
export declare function calculateBackoffDelay(attempt: number, baseDelay?: number, maxDelay?: number, factor?: number): number;
export declare function isRetryableError(error: any): boolean;
export declare function deepClone<T>(obj: T): T;
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