//#region src/is-valid-cei/is-valid-cei.d.ts
/**
 * Validates a CEI (Cadastro Específico do INSS) number.
 *
 * The CEI identifies an employer that has no CNPJ, such as a construction work or a rural
 * producer. It has 12 digits printed as "00.000.00000/00": 11 base digits and one check digit.
 * The check digit weights the base by 7, 4, 1, 8, 5, 2, 1, 6, 3, 7 and 4, adds the tens part of
 * that sum to its units part and takes the complement of the units digit of the result to 10,
 * mapping 10 back to 0. The CEI was replaced by the CNO for construction works and by the CAEPF
 * for individuals, but numbers already issued keep their meaning and their check digit.
 *
 * The value has to be written as the 12 digits, optionally split into the printed groups of 2,
 * 3, 5 and 2 by whitespace or the usual mask characters, a run of them between two groups
 * included; anything else, a letter among the digits included, is rejected instead of being
 * read past.
 *
 * The Receita Federal does not publish the check digit rule of the CEI/CNO numbering, so the
 * calculation follows the reference implementations cited below, cross-checked against the CNO
 * open data of the Receita Federal.
 *
 * @param {string|number} value - The CEI value to be validated.
 * @returns {boolean} True if the CEI is valid, false otherwise.
 *
 * @example
 * ```typescript
 * isValidCei("11.583.00249/85"); // true
 * isValidCei("277297118187"); // true
 * isValidCei(249859674386); // true
 * isValidCei("24.985.96743/68"); // false (invalid check digit)
 * isValidCei("000000000000"); // false (repeated digits)
 * ```
 *
 * @see Official: https://www.gov.br/receitafederal/pt-br/assuntos/orientacao-tributaria/cadastros/cno
 * The registry's own page at the Receita Federal, which describes the cadastro but publishes
 * neither the mask nor the check digit rule.
 * @see Official: https://dados.gov.br/dados/conjuntos-dados/cadastro-nacional-de-obras-cno
 * Cadastro Nacional de Obras (CNO), dados abertos da Receita Federal: the catalogue entry for the
 * dataset this rule was cross-checked against and where the test vectors come from. The check was
 * run over the Minas Gerais extract of the downloaded dataset, which every registered work passed;
 * the catalogue page itself publishes only the dataset's description and download links (and
 * currently flags it "Desatualizado"), not that result.
 * @see Based on: https://github.com/yiibr/yii2-br-validator/blob/master/src/CeiValidator.php
 * PHP reference implementation of the CEI check digit.
 * @see Based on: https://github.com/marcos-cruz/Documento/blob/master/src/Bigai.Documentos.Brasil/Cei/Cei.cs
 * Second, independent reference implementation agreeing with the first.
 */
export declare const isValidCei: (value: string | number) => boolean;
//#endregion