yiekheng
01eb5752ee
Also fix rrule default-import workaround so the shared package loads correctly under NodeNext ESM resolution (rrule@2.8.1 has no exports field).
43 lines
1.5 KiB
TypeScript
43 lines
1.5 KiB
TypeScript
// rrule@2.8.1 lacks a proper "exports" field, so named ESM imports fail at
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// runtime with NodeNext resolution. Use the default import and destructure.
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import rrulePkg from "rrule";
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import type { RRule as RRuleType } from "rrule";
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const { RRule, rrulestr } = rrulePkg as unknown as typeof import("rrule");
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import { DateTime } from "luxon";
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export const MIN_INTERVAL_MS = 5 * 60 * 1000;
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export function parseRRule(rule: string): RRuleType {
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const parsed = rrulestr(rule);
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if (!(parsed instanceof RRule)) {
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throw new Error("Compound RRULE/RRSET not supported");
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}
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return parsed;
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}
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export function nextOccurrence(rule: string, timezone: string, after: Date): Date | null {
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const parsed = parseRRule(rule);
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const afterInZone = DateTime.fromJSDate(after).setZone(timezone).toJSDate();
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const next = parsed.after(afterInZone, false);
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return next ?? null;
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}
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export type IntervalCheck = { ok: true } | { ok: false; reason: string };
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export function validateMinInterval(rule: string, timezone: string): IntervalCheck {
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const parsed = parseRRule(rule);
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const now = new Date();
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const first = parsed.after(now, false);
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if (!first) return { ok: true };
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const second = parsed.after(first, false);
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if (!second) return { ok: true };
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const gap = second.getTime() - first.getTime();
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if (gap < MIN_INTERVAL_MS) {
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return {
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ok: false,
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reason: `Recurrence fires every ${Math.round(gap / 1000)}s; minimum interval is ${MIN_INTERVAL_MS / 1000}s.`,
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};
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}
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return { ok: true };
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}
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