old_contents: const EventEmitter = require('events').EventEmitter;
  const bindings = process.atomBinding('session');
  const PERSIST_PERFIX = 'persist:';
  
  // Returns the Session from |partition| string.
  exports.fromPartition = function(partition) {
    if (partition == null) {
      partition = '';
    }
    if (partition === '') {
      return exports.defaultSession;
    }
    if (partition.startsWith(PERSIST_PERFIX)) {
      return bindings.fromPartition(partition.substr(PERSIST_PERFIX.length), false);
    } else {
      return bindings.fromPartition(partition, true);
    }
  };
  
  // Returns the default session.
  Object.defineProperty(exports, 'defaultSession', {
    enumerable: true,
    get: function() {
      return bindings.fromPartition('', false);
    }
  });
  
  var wrapSession = function(session) {
    // session is an EventEmitter.
    return session.__proto__ = EventEmitter.prototype;
  };
  
  bindings._setWrapSession(wrapSession);
  
new_contents: const EventEmitter = require('events').EventEmitter;
  const bindings = process.atomBinding('session');
  const PERSIST_PREFIX = 'persist:';
  
  // Returns the Session from |partition| string.
  exports.fromPartition = function(partition) {
    if (partition == null) {
      partition = '';
    }
    if (partition === '') {
      return exports.defaultSession;
    }
    if (partition.startsWith(PERSIST_PREFIX)) {
      return bindings.fromPartition(partition.substr(PERSIST_PREFIX.length), false);
    } else {
      return bindings.fromPartition(partition, true);
    }
  };
  
  // Returns the default session.
  Object.defineProperty(exports, 'defaultSession', {
    enumerable: true,
    get: function() {
      return bindings.fromPartition('', false);
    }
  });
  
  var wrapSession = function(session) {
    // session is an EventEmitter.
    return session.__proto__ = EventEmitter.prototype;
  };
  
  bindings._setWrapSession(wrapSession);
  
subject: Rename constant `PERSIST_PERFIX` to `PERSIST_PREFIX` in `session.js`.