/**
 * Generates a random, valid UK National Insurance number
 * https://www.gov.uk/hmrc-internal-manuals/national-insurance-manual/nim39110
 * @returns string
 */
declare const random: () => string;

/**
 * Returns a generator instance to allow you to call `next()`
 * to go through all valid ni numbers in sequence, starting at
 * AA000000A up to ZY999999D
 * @returns Generator<string>
 */
declare const incremental: () => Generator<string>;

/**
 * Normalises NINOs which have formatting in them
 * e.g. `AA 00 00 00 A` will be returned as `AA000000A`
 * @param nino
 * @returns string
 */
declare const normalise: (nino: string) => string;

interface ValidateResult {
    rules?: {
        type?: boolean;
        length?: boolean;
        prefix?: boolean;
        number?: boolean;
        suffix?: boolean;
    };
    outcome: boolean;
}
/**
 * Validates UK National Insurance numbers in accordance with https://www.gov.uk/hmrc-internal-manuals/national-insurance-manual/nim39110
 * @param nino
 * @returns ValidateResult
 */
declare const validate: (nino: string) => ValidateResult;

export { type ValidateResult, incremental, normalise, random, validate };