import { Hex } from '@cfxdevkit/cdk';
/** Bytes -> 0x-prefixed hex. */
export declare function toHex(bytes: Uint8Array): Hex;
/** 0x-prefixed hex -> bytes. Throws on malformed input. */
export declare function fromHex(hex: Hex): Uint8Array;
/** Bytes -> URL-safe base64 (RFC 4648 section 5, no padding). */
export declare function toBase64Url(bytes: Uint8Array): string;
/** URL-safe base64 -> bytes. */
export declare function fromBase64Url(text: string): Uint8Array;
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