(method) CreateFlightComponent.handleSave({ currentValue, stepIndex }: {
    currentValue: Partial<Flight>;
    stepIndex: number;
}): void

handleSave({
    currentValue,
    stepIndex
  }: {
    currentValue: Partial<Flight>;
    stepIndex: number;
  }) {
// some code here
}

{ currentValue, stepIndex }: {
        currentValue: Partial<Flight>;
        stepIndex: number;
    }