@klyftig/alarm-kit

Expo native module (iOS only): a thin bridge over Apple's AlarmKit (iOS 26+) — OS-owned alarms that fire even when the app is killed and break through silent mode / Focus. Extracted from Sleepwise's modules/sleepwise-alarm-kit (2026-09-15); the Swift identifier is still SleepwiseAlarmKit.

import { alarmKit, isAlarmKitAvailable, getAlarmKitAuthorization, requestAlarmKitAuthorization } from '@klyftig/alarm-kit';

if (isAlarmKitAvailable() && (await requestAlarmKitAuthorization()) === 'authorized') {
  await alarmKit.schedule(id, fireAtMs, label);   // the alert's Open button deep-links into the app
  alarmKit.stop(id);                              // after the mission is cleared
}
alarmKit.getAlerting();                           // ids currently ringing (fire-handler polling)
alarmKit.listScheduled();                         // { id, fireAt }[]

• Weak-linked and #available-guarded: on iOS < 26 (and on Android / jest) isAlarmKitAvailable() is false and every call is a no-op.
• @klyftig/alarm-core's iosCoordinator picks one path per alarm (AlarmKit when available + authorized, otherwise a time-sensitive notification), so the two never double-fire.
• Requires NSAlarmKitUsageDescription in Info.plist — @klyftig/alarm-core's config plugin adds it.

Never run on a physical iPhone yet (simulator build only). Validation items live in @klyftig/alarm-core/TEST_PROTOCOL.md. Known follow-ups: bundled alarm tone for the AlarmKit alert, Live Activity widget extension.