import type { BrandedPrimitiveDefinition } from '@digitaldefiance/branded-interface';
import type { Brand } from 'ts-brand';
export declare const BlockIdPrimitive: BrandedPrimitiveDefinition<string>;
/**
 * Branded type for block IDs (lowercase hex checksums).
 * Accepts 64-char (SHA-256) or 128-char (SHA3-512) hex strings.
 * Provides compile-time type safety to prevent mixing block IDs with other string types.
 */
export type BlockId = Brand<string, 'BlockId'>;
/**
 * Validate and cast a hex string to the BlockId branded type.
 * @param hex - The hex string to validate (64 or 128 lowercase hex chars)
 * @returns The validated BlockId
 * @throws Error if the string is not a valid block ID hex string
 */
export declare function asBlockId(hex: string): BlockId;
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