toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (expireAfterMs != null) 'expireAfterMs': expireAfterMs!,
if (liftWhenExpired != null) 'liftWhenExpired': liftWhenExpired!,
if (remindAfterMs != null) 'remindAfterMs': remindAfterMs!,
};