/**
 * Input validation helpers for IBGE MCP Server
 */
export declare const UF_CODES: Set<number>;
export declare const REGION_CODES: Set<number>;
export declare const UF_SIGLAS: Record<string, number>;
/**
 * Validates if a string is a valid IBGE code
 */
export declare function isValidIbgeCode(code: string): boolean;
/**
 * Normalizes a state input to its IBGE code, accepting sigla ("SP"), name
 * ("São Paulo", accent/case-insensitive) or code ("35") interchangeably.
 * Delegates to the single UF resolver in config.ts.
 */
export declare function normalizeUf(input: string): number | null;
/**
 * A user-supplied date broken into its components.
 */
export interface ParsedDate {
    day: number;
    month: number;
    year: number;
}
/**
 * Parses a user-supplied date into its components.
 *
 * The canonical, recommended format is Brazilian `DD/MM/AAAA`. For convenience
 * we also accept `DD-MM-AAAA` (same day-first order) and ISO `AAAA-MM-DD`.
 * Month-first ordering (the old `MM-DD-AAAA`) is intentionally NOT accepted — it
 * is ambiguous for Brazilian users and silently produced wrong results. Each
 * tool re-emits the parsed date in whatever its upstream API requires; see
 * `toIbgeApiDate` (MM-DD-AAAA).
 *
 * Returns null if the input does not match a supported format or is out of range.
 */
export declare function parseUserDate(input: string): ParsedDate | null;
/**
 * Formats a parsed date as `MM-DD-AAAA` — the (month-first) format the IBGE
 * notícias and calendário APIs expect. Confirmed empirically against the live API.
 */
export declare function toIbgeApiDate(d: ParsedDate): string;
/**
 * Validates period format for SIDRA
 */
export declare function isValidPeriod(period: string): boolean;
/**
 * Validates territorial level
 */
export declare function isValidTerritorialLevel(level: string): boolean;
/**
 * Parses and validates locality codes
 */
export declare function parseLocalidades(input: string): {
    valid: string[];
    invalid: string[];
};
/**
 * Validates CNAE code format
 */
export declare function isValidCnaeCode(code: string): boolean;
/**
 * Formats validation error message
 */
export declare function formatValidationError(field: string, value: string, expected: string): string;
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