import type { Hex, HexConfig } from './hex.ts';
/**
 * Type guard that checks whether a value is a valid hex string.
 * @param value - The value to check
 * @param config - Optional configuration for prefix and bit length validation
 * @returns True if the value is a valid Hex string
 */
export declare const isHex: (value: unknown, config?: HexConfig) => value is Hex;
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