export declare const DEFAULT_LAMPORTS_PER_BYTE_YEAR = 3480;
export declare const DEFAULT_RENT_EXEMPTION_MULTIPLIER = 2;
export declare function calculateRentExemption(accountSize: number, lamportsPerByteYear?: number, exemptionMultiplier?: number): number;
export declare function isValidSolanaAddress(address: string): boolean;
export declare function formatSolanaAddress(address: string, startChars?: number, endChars?: number, ellipsis?: string): string;