import BN from 'bn.js';
export declare type BigNumberish = string | number | BN;
export declare function isHex(hex: string): boolean;
export declare function toBN(number: BigNumberish, base?: number | 'hex'): BN;
export declare function toHex(number: BN): string;
export declare function assertInRange(input: BigNumberish, lowerBound: BigNumberish, upperBound: BigNumberish, inputName?: string): void;