/**
 * Normalize a Dutch postcode to the canonical `1234AB` form.
 * Returns `null` when the input does not match the expected pattern
 * or uses a forbidden letter pair.
 */
export declare function normalizePostcode(input: unknown): string | null;
/** Cheap synchronous format check. Does not verify the postcode exists. */
export declare function isValidPostcodeFormat(input: unknown): boolean;
/**
 * Parse a huisnummer input into a positive integer. Accepts numbers or
 * numeric strings (trimmed). Returns `null` for anything else.
 */
export declare function parseHuisnummer(input: unknown): number | null;
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