systemjs/test/tests/advanced-plugin.js

exports.locate = function(load) {
  return {
    then: function(resolve, reject) {
      setTimeout(function() {
        resolve('custom fetch');
      }, 20);      
    }
  };
}

exports.fetch = function(load) {
  return {
    then: function(resolve, reject) {
      setTimeout(function() {
        resolve(load.address);
      }, 20);
    }
  }
}

exports.translate = function(load) {
  return 'q = "' + load.source + '!";';
}