/**
 * VeChain Unit Converter Utility
 *
 * VeChain uses the same unit system as Ethereum:
 * - 1 VET = 10^18 wei
 * - 1 VTHO = 10^18 wei
 *
 * Common units:
 * - wei: smallest unit
 * - kwei: 10^3 wei
 * - mwei: 10^6 wei
 * - gwei: 10^9 wei
 * - ether/VET/VTHO: 10^18 wei
 */
/**
 * Convert from one unit to another
 */
export declare function convertUnits(value: string | number | bigint, fromUnit: string, toUnit: string): string;
/**
 * Convert wei to VET
 */
export declare function weiToVet(wei: string | bigint): string;
/**
 * Convert VET to wei
 */
export declare function vetToWei(vet: string | number): string;
/**
 * Convert wei to VTHO
 */
export declare function weiToVtho(wei: string | bigint): string;
/**
 * Convert VTHO to wei
 */
export declare function vthoToWei(vtho: string | number): string;
/**
 * Format token amount with decimals
 */
export declare function formatTokenAmount(amount: string | bigint, decimals: number): string;
/**
 * Parse token amount with decimals
 */
export declare function parseTokenAmount(amount: string | number, decimals: number): string;
/**
 * Format VET amount for display
 */
export declare function formatVet(wei: string | bigint, precision?: number): string;
/**
 * Format VTHO amount for display
 */
export declare function formatVtho(wei: string | bigint, precision?: number): string;
/**
 * Add commas to large numbers for readability
 */
export declare function addCommas(value: string): string;
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