old_contents: const SubscriberAggregator = require("./SubscriberAggregator");
  const Emittery = require("emittery");
  
  class EventManager {
    constructor(eventManagerOptions) {
      const { logger, muteReporters, globalConfig } = eventManagerOptions;
  
      // Keep a reference to these so it can be cloned
      // if necessary in truffle-config
      this.initializationOptions = eventManagerOptions;
      this.emitter = new Emittery();
  
      const initializationOptions = {
        emitter: this.emitter,
        globalConfig,
        logger,
        muteReporters
      };
      this.initializeSubscribers(initializationOptions);
    }
  
    emit(event, data) {
      this.emitter.emit(event, data);
    }
  
    initializeSubscribers(initializationOptions) {
      new SubscriberAggregator(initializationOptions);
    }
  }
  
  module.exports = EventManager;
  
new_contents: const SubscriberAggregator = require("./SubscriberAggregator");
  const Emittery = require("emittery");
  
  class EventManager {
    constructor(eventManagerOptions) {
      const { logger, muteReporters, globalConfig } = eventManagerOptions;
  
      // Keep a reference to these so it can be cloned
      // if necessary in truffle-config
      this.initializationOptions = eventManagerOptions;
      this.emitter = new Emittery();
  
      const initializationOptions = {
        emitter: this.emitter,
        globalConfig,
        logger,
        muteReporters
      };
      this.initializeSubscribers(initializationOptions);
    }
  
    emit(event, data) {
      return this.emitter.emit(event, data);
    }
  
    initializeSubscribers(initializationOptions) {
      new SubscriberAggregator(initializationOptions);
    }
  }
  
  module.exports = EventManager;
  
subject: Return the result of calling emit on emittery