How to use the @aurelia/i18n.Signals.RT_SIGNAL function in @aurelia/i18n

public changeMyDate() {
    this.myDate.setFullYear(this.myDate.getFullYear() - 1);
    this.signaler.dispatchSignal(Signals.RT_SIGNAL);
  }
}

await ctx.scheduler.queueMacroTask(delta => {
        ctx.container.get(ISignaler).dispatchSignal(Signals.RT_SIGNAL);
        ctx.scheduler.getRenderTaskQueue().flush();
        assertTextContent(host, 'span', `${Math.round(delta / 1000)} seconds ago`);
      }, { delay: 3000 }).result;
    });

await ctx.scheduler.queueMacroTask(delta => {
        ctx.container.get(ISignaler).dispatchSignal(Signals.RT_SIGNAL);
        ctx.scheduler.getRenderTaskQueue().flush();
        assertTextContent(host, 'span', `${Math.round(delta / 1000)} seconds ago`);
      }, { delay: 3000 }).result;
    });