code: function camelcase(str) {
    if (!/[\s\W]/.test(str)) return str;
    if (str.length === 1) {
      return str.toLowerCase();
    }
    str = str.replace(/^[\W_]+|[\W_]+$/g, '').toLowerCase();
    return str.replace(/[\W_]+(\w|$)/g, function(_, ch) {
      return ch.toUpperCase();
    });
  }
docs: Used to camelcase the module if a variable is not defined.
  
  @param  {String} `str` String containing `_`, `.`, `-` or whitespace that will be camelcased.
  @return {String} camelcased string.