class MessagesService {
 base = {
    flowEditor: {
      generatingStarted: {
        summary: 'Generating!',
        detail: 'App started generating.',
        severity: 'info'
      }
    }
  }

  send(get: (any) => any) {
    const message = get(this.base);
    this.messages.push({severity: message.severity, summary: message.heading, detail: message.details});
    this.removeAfterFewSeconds(this.messages, this.messages.indexOf({
      severity: message.severity,
      summary: message.summary,
      detail: message.detail
    }));
  }
}
// -------------------USAGE--------------------------------------
  this.messageService.send(get => get.flowEditor.generatingStarted);