@elemental-design/expo-notifications/src/scheduleNotificationAsync.ts

Notifications module

import uuidv4 from 'uuid/v4';

import NotificationScheduler from './NotificationScheduler';
import { NotificationTriggerInput as NativeNotificationTriggerInput } from './NotificationScheduler.types';
import {
  NotificationRequestInput,
  NotificationTriggerInput,
  DailyTriggerInput,
  CalendarTriggerInput,
  TimeIntervalTriggerInput,
} from './Notifications.types';

export default async function scheduleNotificationAsync(
  request: NotificationRequestInput
): Promise<string> {
  return await NotificationScheduler.scheduleNotificationAsync(
    request.identifier ?? uuidv4(),
    request.content,
    parseTrigger(request.trigger)
  );
}

function parseTrigger(userFacingTrigger: NotificationTriggerInput): NativeNotificationTriggerInput {
  if (userFacingTrigger === null) {
    return null;
  }

  if (userFacingTrigger === undefined) {
    throw new TypeError(
      'Encountered an `undefined` notification trigger. If you want to trigger the notification immediately, pass in an explicit `null` value.'
    );
  }

  if (userFacingTrigger instanceof Date) {
    return { type: 'date', timestamp: userFacingTrigger.getTime() };
  } else if (typeof userFacingTrigger === 'number') {
    return { type: 'date', timestamp: userFacingTrigger };
  } else if (isDailyTriggerInput(userFacingTrigger)) {
    const hour = userFacingTrigger.hour;
    const minute = userFacingTrigger.minute;
    if (hour === undefined || hour == null || minute === undefined || minute == null) {
      throw new TypeError('Both hour and minute need to have valid values. Found undefined');
    }
    if (hour < 0 || hour > 23) {
      throw new RangeError(`The hour parameter needs to be between 0 and 23. Found: ${hour}`);
    }
    if (minute < 0 || minute > 59) {
      throw new RangeError(`The minute parameter needs to be between 0 and 59. Found: ${minute}`);
    }
    return {
      type: 'daily',
      hour,
      minute,
    };
  } else if (isSecondsPropertyMisusedInCalendarTriggerInput(userFacingTrigger)) {
    throw new TypeError(
      'Could not have inferred the notification trigger type: if you want to use a time interval trigger, pass in only `seconds` with or without `repeats` property; if you want to use calendar-based trigger, pass in `second`.'
    );
  } else if ('seconds' in userFacingTrigger) {
    return {
      type: 'timeInterval',
      seconds: userFacingTrigger.seconds,
      repeats: userFacingTrigger.repeats ?? false,
    };
  } else {
    const { repeats, ...calendarTrigger } = userFacingTrigger;
    return { type: 'calendar', value: calendarTrigger, repeats };
  }
}

function isDailyTriggerInput(
  trigger: DailyTriggerInput | CalendarTriggerInput | TimeIntervalTriggerInput
): trigger is DailyTriggerInput {
  return (
    Object.keys(trigger).length === 3 &&
    'hour' in trigger &&
    'minute' in trigger &&
    'repeats' in trigger &&
    trigger.repeats === true
  );
}

function isSecondsPropertyMisusedInCalendarTriggerInput(
  trigger: TimeIntervalTriggerInput | CalendarTriggerInput
) {
  return (
    // eg. { seconds: ..., repeats: ..., hour: ... }
    ('seconds' in trigger && 'repeats' in trigger && Object.keys(trigger).length > 2) ||
    // eg. { seconds: ..., hour: ... }
    ('seconds' in trigger && !('repeats' in trigger) && Object.keys(trigger).length > 1)
  );
}