index.js

/**
 * Case a string to slug case
 * @param {string} str the string 
 * @returns the slug string
 */
const slugcase = (str) => {
  str = str.trim();
  str = str.replace(/^\s+|\s+$/g, ''); // trim
  str = str.toLowerCase();

  // remove accents, swap ñ for n, etc
  const from = 'ãàáäâẽèéëêìíïîõòóöôùúüûñç·/_,:;';
  const to = 'aaaaaeeeeeiiiiooooouuuunc------';
  for (let i = 0, l = from.length; i < l; i++) {
    str = str.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
  }

  str = str
    .replace(/[^a-z0-9 -]/g, '') // remove invalid chars
    .replace(/\s+/g, '-') // collapse whitespace and replace by -
    .replace(/-+/g, '-') // collapse dashes
    .replace(/^-+/, '')  // Trim - from start of text
    .replace(/-+$/, ''); // Trim - from end of text
  return str;
};

module.exports.slugcase = slugcase;