fabric.js/src/util/lang_string.js

if (!String.prototype.trim) {
  String.prototype.trim = function () {
    return this.replace(/^\s+/, '').replace(/\s+$/, '');
  };
}

function camelize(string) {
  return string.replace(/-+(.)?/g, function(match, character) {
    return character ? character.toUpperCase() : '';
  });
}

function capitalize(string) {
  return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase();
}

fabric.util.string = {
  camelize: camelize,
  capitalize: capitalize
};