src/app/services/message.service.ts

import { Injectable, EventEmitter } from '@angular/core';

export class MessageDefines {
    static MSG_LOG_IN_SUCCEEDED = 'LOG_IN_SUCCEEDED';
    static MSG_LOG_OFF = 'LOG_OFF';
}
  
@Injectable()
export class MessageService {

  public loginLogoff$: EventEmitter< string > = new EventEmitter< string >();

  public matrixFilterChanged$: EventEmitter<Number[]> = new EventEmitter< Number[] >();

  constructor() { }

}