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@sebse-tools/ics-parser

v2.0.1

Published

Full RFC 5545 iCalendar implementation. Parse, prepare, expand, and query .ics data with complete RRULE support, DST-aware timezone resolution, and serialize/deserialize caching

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Links

Maintainers

sebsesebse

Keywords

Readme

@sebse-tools/ics-parser

version repo

Full RFC 5545 iCalendar implementation. Parse, prepare, expand, and query .ics data with complete RRULE support, DST-aware timezone resolution, and serialize/deserialize caching

This package is a complete TypeScript implementation of RFC 5545 for parsing, preparing, and querying iCalendar (.ics) data. It exposes a low-level, composable API that can be consumed by any application needing structured calendar event data.

Key Features

  • Two-Phase Processing: prepare() parses raw ICS strings into a structured PreparedIcs object (VEVENT components + timezone map). getEventsBetween() then expands that data for a given UTC time range — enabling efficient caching between the two steps.
  • Serialize / Deserialize: serialize() and deserialize() convert PreparedIcs to/from JSON, allowing prepared data to be stored and reloaded without re-parsing.
  • Full RFC 5545 RRULE Expansion: Recurring events are expanded via a generator-based engine with complete support for FREQ, INTERVAL, COUNT, UNTIL, BYDAY, BYMONTHDAY, BYMONTH, BYWEEKNO, BYYEARDAY, BYSETPOS, WKST, RDATE, and EXDATE.
  • DST-Aware Timezone Resolution: VTIMEZONE components are processed into transition tables. UTC offsets are resolved correctly across DST boundaries, including ambiguous (fall-back) and non-existent (spring-forward) local times.
  • Windows Timezone Support: Non-IANA timezone identifiers (e.g., Eastern Standard Time) are resolved to IANA equivalents via windows-iana.
  • Unexpanded Event Access: getUnexpandedEvents() returns parsed but non-expanded events — useful for search without generating all recurrence instances.
  • RFC 5545 Exception Handling: Recurring event overrides (RECURRENCE-ID) and exclusions (EXDATE) are correctly applied per UID group during full calendar expansion.

Recent Changes

Version 2.0.0

  • 6e9bfb2: rename monorepo and unscope n8n package

Version 1.0.2

  • 288bd1d: remove redundant .gitignore and format readme

Version 1.0.1

  • 942044b: update tests to pass random number generator

Authors

  • sebse

License

This project is licensed under the AGPL-3.0-only License. See the LICENSE file for details.