@w.dental/date-mask/dist/index.js

Lib for using as maks for date input

/*!
 * @w.dental/date-mask v0.0.2
 * (c) W-Dental
 * Released under the MIT License.
 */
'use strict';

var LETTERS_REGEX = /[a-z]/gi;
var ONLY_NUMBERS_REGEX = /\D/gi;

function dateMask(num) {
  if (num === void 0) {
    num = '';
  }

  if (typeof num !== 'string' || LETTERS_REGEX.test(num)) {
    throw new Error('You must to pass a digits as string with pattern DD/MM/YYYY or MM/DD/YYYY');
  }

  var numString = num.replace(ONLY_NUMBERS_REGEX, '');
  if (numString.length === 3) return numString.replace(/(\d{2})/, '$1/');
  if (numString.length > 3 && numString.length < 5) return numString.replace(/(\d{2})(\d+)/, '$1/$2');
  if (numString.length >= 5 && numString.length <= 8) return numString.replace(/(\d{2})(\d{2})(\d+)/, '$1/$2/$3');else return numString.substring(0, 10);
}

module.exports = dateMask;