@lacspace/ics
Small, correct iCalendar (RFC 5545) + iTIP (RFC 5546) parser and builder for webmail meeting invites. parseIcs() reads Google Calendar, Outlook/Exchange and Apple invites: line unfolding (byte-level, so folds that split UTF-8 characters survive), quoted parameters, text escaping, DATE vs DATE-TIME, UTC/floating/TZID times converted to UTC via Intl (IANA names, 60+ Windows zone names like "Nepal Standard Time", custom VTIMEZONE rules), DST gaps/overlaps per RFC 5545, DURATION, attendees, organizer, VALARM, RRULE/EXDATE/RDATE passthrough, RECURRENCE-ID overrides, Google Meet/Teams links. buildIcs() writes CRLF calendars folded at 75 octets (never splitting a multibyte character) with optional TZID + VTIMEZONE. buildReplyIcs() / replyEmail() produce RFC 5546 METHOD:REPLY RSVPs (Accept/Decline/Tentative); buildCancelIcs() cancels. Never throws on malformed input. Zero dependencies; Node 18+, edge runtimes and browsers.
npm i @lacspace/icsUsage
import { parseIcsEvent, replyEmail, buildIcs } from "@lacspace/ics";
const ev = parseIcsEvent(icsText);
// { uid: "040000008200E…", sequence: 2, summary: "Sprint review",
// start: "2026-10-20T08:15:00Z", end: "2026-10-20T09:15:00Z", allDay: false,
// startTzid: "Nepal Standard Time", organizer: { name: "Shrestha, Anil", address: "anil@contoso.com" },
// attendees: [{ name: "Sita Rai", address: "sita@contoso.com", role: "REQ-PARTICIPANT", partstat: "NEEDS-ACTION", rsvp: true }],
// conference: "https://teams.microsoft.com/l/meetup-join/…", alarms: [{ action: "DISPLAY", trigger: "-PT15M" }], … }
const rsvp = replyEmail(ev!, { address: "sita@contoso.com" }, "ACCEPTED");
// { subject: "Accepted: Sprint review", to: "anil@contoso.com", text, ics,
// contentType: "text/calendar; method=REPLY; charset=UTF-8", filename: "invite.ics" }Exports 17
DEFAULT_PRODIDWINDOWS_TIMEZONESbuildCancelIcsbuildIcsbuildReplyIcsbuildVTimezoneescapeTextfoldparseContentLineparseDateTimeparseDurationparseIcsparseIcsEventreplyEmailresolveZoneunescapeTextunfoldKeywords
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