@lacussoft/cpf-gen/build/index.mjs

Utility function to generate valid CPF (Brazilian ID document).

import cpfFmt from '@lacussoft/cpf-fmt';
import numOnly from 'num-only';
import mergeDeep from 'deepmerge';

const defaultOptions = {
  format: false,
  prefix: ""
};
function mergeOptions(customOptions = {}) {
  return mergeDeep(defaultOptions, customOptions);
}

function numberGenerator(length) {
  const numericSequence = [];
  while (numericSequence.length < length) {
    const random = Math.random() * 10;
    const integer = Math.floor(random);
    numericSequence.push(integer);
  }
  return numericSequence;
}

function cpfGen(options) {
  const userOptions = mergeOptions(options);
  const baseSequence = numOnly(userOptions.prefix);
  const prefixLength = baseSequence.length;
  if (prefixLength < 0 || prefixLength > 9) {
    throw new Error('Option "prefix" must be a string containing between 1 and 9 digits.');
  }
  const cpfSequence = baseSequence.split("").map(Number).concat(numberGenerator(9 - prefixLength));
  [9, 10].forEach((nextNumIndex) => {
    let factor = nextNumIndex + 1;
    let sum = 0;
    for (let n = 0; n < nextNumIndex; n++, factor--) {
      sum += cpfSequence[n] * factor;
    }
    const remainder = 11 - sum % 11;
    cpfSequence.push(remainder > 9 ? 0 : remainder);
  });
  return userOptions.format ? cpfFmt(cpfSequence.join("")) : cpfSequence.join("");
}

export { cpfGen as default };
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