validations-br/lib/validations/validateCNPJ.js

A validator to BR informations

import { isRepeated } from "./utils.js";

//#region src/validations/validateCNPJ.ts
/**
* The function `validateCNPJ` validates a Brazilian CNPJ number.
* @param {string} value - The `value` parameter is a string that represents the CNPJ (Cadastro
* Nacional da Pessoa Jurídica) number to be validated. It can be formatted with or without punctuation,
* like '00.000.000/0000-00' or '00000000000000'.
* @returns The function `validateCNPJ` returns a boolean value. It returns `true` if the CNPJ is
* valid, and `false` otherwise.
*/
function validateCNPJ(value) {
	const cnpj = String(value).replace(/[^\d]+/g, "");
	if (cnpj === "" || cnpj.length !== 14 || isRepeated(cnpj)) return false;
	const calculateDigit = (numbers, weights) => {
		let sum = 0;
		for (let i = 0; i < numbers.length; i++) sum += parseInt(numbers.charAt(i), 10) * weights[i];
		const remainder = sum % 11;
		return remainder < 2 ? 0 : 11 - remainder;
	};
	const weights1 = [
		5,
		4,
		3,
		2,
		9,
		8,
		7,
		6,
		5,
		4,
		3,
		2
	];
	const first12 = cnpj.substring(0, 12);
	if (calculateDigit(first12, weights1) !== parseInt(cnpj.charAt(12), 10)) return false;
	const weights2 = [
		6,
		5,
		4,
		3,
		2,
		9,
		8,
		7,
		6,
		5,
		4,
		3,
		2
	];
	const first13 = cnpj.substring(0, 13);
	return calculateDigit(first13, weights2) === parseInt(cnpj.charAt(13), 10);
}

//#endregion
export { validateCNPJ };