@perdieminc/time-slots

Generate time slots for scheduling—pickup, delivery, and curbside—with timezone-aware business hours, prep time, and optional pre-sale / catering rules.

Requirements

• Node.js ≥ 20
• TypeScript (consumers can use the package from source or your built output)

Install

npm install @perdieminc/time-slots

Overview

This library helps you:

• Build fulfillment schedules (days and time slots) for a given location and fulfillment type (pickup, delivery, curbside).
• Respect business hours and overrides (e.g. holidays, special hours).
• Apply prep time (per shift or per day) and slot gaps to compute the first available slot and generate slots.
• Support pre-sale windows (date range and optional custom hours) and weekly pre-sale (fixed pickup/ordering days).
• Support catering flows with cart-derived prep time (by minute, hour, or day).
• Filter slots by busy times and optional menu/category rules.

All date/time logic is timezone-aware (e.g. America/New_York). The package supports multiple platforms for timezone handling: web (default, uses @date-fns/tz) and ios/android (uses timezone-support).

Main API

getSchedules(params): GetSchedulesResult

Builds the schedule for the current location and fulfillment preference.

Parameters (GetSchedulesParams):

Field	Description
store	Store config: ASAP/same-day flags, max future days, business hour overrides, pre-sale and weekly pre-sale config.
locations	List of locations (with location_id, timezone, and business hours).
cartItems	Cart items (used for pre-sale, weekly pre-sale, catering prep time, and category-based filtering).
fulfillmentPreference	"PICKUP" | "DELIVERY" | "CURBSIDE".
prepTimeSettings	Prep time in minutes, per-weekday overrides, gap, busy times, fulfillAtBusinessDayStart (when true, prep is by day; when false, by minutes), and optional delivery buffer.
currentLocation	The location to generate the schedule for.
isCateringFlow	If true, prep time is derived from cart catering config.
platform	"web" | "ios" | "android" for timezone handling (default "web").

Returns: { schedule: FulfillmentSchedule, isWeeklyPreSaleAvailable: boolean }.

• schedule is an array of day schedules, each with date, openingTime, closingTime, firstAvailableSlot, and slots (array of Date).

Types and constants

• Fulfillment: FULFILLMENT_TYPES, FulfillmentType, FulfillmentSchedule, DaySchedule.
• Prep time: PrepTimeBehaviour (first shift / every shift / roll), DEFAULT_PREP_TIME_IN_MINUTES, DEFAULT_GAP_IN_MINUTES, MINUTES_PER_DAY, PrepTimeSettings, PrepTimeCadence (minute / hour / day).
• Store / cart: StoreConfig, PreSaleConfig, WeeklyPreSaleConfig, CartItem, PrepTimeSettings, CateringPrepTimeResult.
• Location / hours: LocationLike, BusinessHour, BusinessHoursOverrideInput / Output, getLocationsBusinessHoursOverrides, getOpeningClosingTime.
• Platform: PLATFORM (web, ios, android).

Utilities (exported)

• getCateringPrepTimeConfig(params) – Derives prep time cadence and frequency from cart items for catering.
• getPreSalePickupDates(pickupDays, orderingDays) – Dates when weekly pre-sale pickup is allowed.
• isTodayInTimeZone(date, timezone) / isTomorrowInTimeZone(date, timezone) – Date checks in a given timezone.
• overrideTimeZoneOnUTC(utcDate, timezone) – Interpret a UTC date in a store timezone.
• filterBusyTimesFromSchedule({ schedule, busyTimes, cartCategoryIds }) – Remove busy blocks from a schedule.
• filterMenusFromSchedule – Filter schedule by menu type.
• getOpeningClosingTime(params) – Opening/closing time for a given date and business hours.

Internal schedule generation uses getNextAvailableDates-style logic (timezone-aware “next N open days”) and slot generation with configurable prep time behaviour and gap.

Prep time (high level)

Prep time is either by minutes or by day (e.g. in dashboard, when prep is set to “day”, it is treated as day-based).

• By day: First slot is at business start (opening) on the next open day(s). Number of days is derived from prepTimeInMinutes (e.g. 1440 min = 1 day).
• By minutes: First slot = order time + prep minutes, within store hours.
• Per weekday: different prep minutes per day via weekDayPrepTimes (when not using day-based prep).
• Catering: when isCateringFlow is true, cadence and frequency are derived from cart items via getCateringPrepTimeConfig.
• Delivery: optional estimatedDeliveryMinutes added to weekday prep times for delivery.

QA-friendly test cases (Given / When / Expected) are in docs/TEST-CASES.md.

Scripts

npm run build        # Compile TypeScript
npm run test         # Run tests
npm run test:coverage
npm run lint         # Lint with Biome
npm run format       # Format with Biome

License

MIT © Per Diem Subscriptions Inc.

Repository

• Homepage: time-slots
• Issues: time-slots/issues