How to use the event-kit.Emitter function in event-kit

constructor(delay) {
    this.events = []
    this.ranEvents = []
    this.delay = delay
    this.isRunning = false
    this.emitter = new Emitter()
  }

constructor(props) {
    super(props);
    this.emitter = new Emitter();
    this.title = 'PR #18705';
    this.hasTerminatedPendingState = false;
  }

constructor() {
    this.emitter = new Emitter();
    this.value = undefined;
  }

constructor() {
    this.emitter = new Emitter();
    this.listenerCounts = {};
    this.listenerCountChanges = {};
  }

constructor({ project, commands, stateStore }) {
    this.stateStore = stateStore;
    this.emitter = new Emitter();
    this.projects = [];
    this.disposables = new CompositeDisposable();
    this.disposables.add(
      commands.add(
        'atom-workspace',
        { 'application:clear-project-history': this.clearProjects.bind(this) },
        false
      )
    );
    this.disposables.add(
      project.onDidChangePaths(projectPaths => this.addProject(projectPaths))
    );
  }