import { BigNumber } from '@0xproject/utils';
export declare const utils: {
    isBigNumber(value: any): boolean;
    convertHexToNumber(value: string): number;
    convertHexToNumberOrNull(hex: string | null): number | null;
    convertAmountToBigNumber(value: string | number | BigNumber): BigNumber;
    encodeAmountAsHexString(value: string | number | BigNumber): string;
    numberToHex(value: number): string;
    isHexStrict(hex: string | number): boolean;
};
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