File Content: index.js 'use strict'; module.exports = (text, separator = '_') => { if (!(typeof text === 'string' && typeof separator === 'string')) { throw new TypeError('The `text` and `separator` arguments should be of type `string`'); } return text .replace(/([\p{Lowercase_Letter}\d])(\p{Uppercase_Letter})/gu, `$1${separator}$2`) .replace(/(\p{Uppercase_Letter}+)(\p{Uppercase_Letter}\p{Lowercase_Letter}+)/gu, `$1${separator}$2`) .toLowerCase(); }; Submit