import BigNumber from 'bignumber.js';
export declare function toBigNumber(amount?: any): BigNumber;
export declare function toUtf8(hex: any): string;
export declare function fromUtf8(string: any): string;
export declare function toAscii(hex: any): string;
export declare function fromAscii(string: any, padding: any): string;
export declare function toDecimal(value: any): number;
export declare function fromDecimal(value: any): string;
export declare function fromSun(sun: any): string | BigNumber;
export declare function toSun(trx: any): string | BigNumber;
export declare function isNotNullOrUndefined(val: any): boolean;