/**
 * ID Utilities
 * Centralized ID normalization, validation, and format detection
 */
/**
 * Normalize a Notion ID by removing hyphens
 * Ensures consistent comparison regardless of input format
 */
export declare function normalizeId(id: string): string;
/**
 * Validate whether a string looks like a Notion UUID
 * Accepts: "a3802967-3621-4b04-b6af-bfef1b7687b3" or "a380296736214b04b6afbfef1b7687b3"
 */
export declare function isValidNotionId(id: string): boolean;
/**
 * Format a compact UUID into hyphenated form (8-4-4-4-12)
 * Returns original string if not a valid 32-char hex
 */
export declare function formatId(id: string): string;
/**
 * Check if a string is valid base64 encoding
 * Used to validate file_content before Buffer.from
 * Implements strict validation by checking character set, length, and canonicality
 */
export declare function isValidBase64(str: string): boolean;
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