south-african-id-validator/dist/index.d.cts

Validate South African ID numbers and extract date of birth, gender, and citizenship. TypeScript-native, zero dependencies, runs anywhere.

//#region src/types.d.ts
/**
 * The gender encoded in a South African ID number.
 */
type Gender = "male" | "female";
/**
 * The citizenship status encoded in a South African ID number.
 */
type Citizenship = "citizen" | "permanent_resident";
/**
 * The reason a South African ID number failed validation.
 *
 * - `INVALID_LENGTH` — the input is not exactly 13 characters.
 * - `INVALID_FORMAT` — the input contains non-digit characters, or the
 *   citizenship digit is neither `0` nor `1`.
 * - `INVALID_CHECKSUM` — the digits form a 13-character numeric string but the
 *   final digit does not match the Luhn checksum of the preceding 12.
 * - `INVALID_DATE` — the first six digits do not form a real calendar date
 *   (e.g. Feb 30, Feb 29 of a non-leap year).
 */
type ValidationErrorCode = "INVALID_LENGTH" | "INVALID_FORMAT" | "INVALID_CHECKSUM" | "INVALID_DATE";
/**
 * The result of validating a South African ID number.
 *
 * Discriminated on `valid`: narrow with `if (result.valid)` to access
 * `dateOfBirth`, `gender`, and `citizenship`; narrow with `if (!result.valid)`
 * to access `error`.
 */
type ValidationResult = {
  valid: true;
  dateOfBirth: Date;
  gender: Gender;
  citizenship: Citizenship;
} | {
  valid: false;
  error: ValidationErrorCode;
};
/**
 * Optional configuration for {@link validate}.
 */
type ValidateOptions = {
  /**
   * The date used as "today" when inferring the century of the encoded year.
   * Inject a fixed value for deterministic tests. Defaults to `new Date()`.
   */
  referenceDate?: Date;
};
//#endregion
//#region src/validate.d.ts
/**
 * Validate a South African ID number and, on success, extract the encoded
 * date of birth, gender, and citizenship.
 *
 * The result is a discriminated union — narrow with `result.valid` to access
 * the data fields, or with `!result.valid` to access the typed `error` code.
 *
 * The pipeline short-circuits on the first failure and reports the most
 * fundamental problem first: length, then character class, then Luhn
 * checksum, then date validity, then citizenship digit.
 *
 * @example
 * ```ts
 * const result = validate('7311190013080');
 * if (result.valid) {
 *   console.log(result.dateOfBirth, result.gender, result.citizenship);
 * } else {
 *   console.error(result.error);
 * }
 * ```
 *
 * @param idNumber The 13-digit ID number to validate.
 * @param options Optional overrides — see {@link ValidateOptions}.
 */
declare function validate(idNumber: string, options?: ValidateOptions): ValidationResult;
//#endregion
export { type Citizenship, type Gender, type ValidateOptions, type ValidationErrorCode, type ValidationResult, validate };
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