47 lines
1.6 KiB
TypeScript
47 lines
1.6 KiB
TypeScript
import { Cron } from "croner";
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import type { CronSchedule } from "./types.js";
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import { parseAbsoluteTimeMs } from "./parse.js";
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export function computeNextRunAtMs(schedule: CronSchedule, nowMs: number): number | undefined {
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if (schedule.kind === "at") {
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// Handle both canonical `at` (string) and legacy `atMs` (number) fields.
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// The store migration should convert atMs→at, but be defensive in case
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// the migration hasn't run yet or was bypassed.
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const sched = schedule as { at?: string; atMs?: number | string };
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const atMs =
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typeof sched.atMs === "number" && Number.isFinite(sched.atMs) && sched.atMs > 0
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? sched.atMs
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: typeof sched.atMs === "string"
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? parseAbsoluteTimeMs(sched.atMs)
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: typeof sched.at === "string"
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? parseAbsoluteTimeMs(sched.at)
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: null;
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if (atMs === null) {
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return undefined;
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}
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return atMs > nowMs ? atMs : undefined;
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}
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if (schedule.kind === "every") {
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const everyMs = Math.max(1, Math.floor(schedule.everyMs));
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const anchor = Math.max(0, Math.floor(schedule.anchorMs ?? nowMs));
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if (nowMs < anchor) {
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return anchor;
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}
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const elapsed = nowMs - anchor;
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const steps = Math.max(1, Math.floor((elapsed + everyMs - 1) / everyMs));
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return anchor + steps * everyMs;
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}
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const expr = schedule.expr.trim();
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if (!expr) {
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return undefined;
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}
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const cron = new Cron(expr, {
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timezone: schedule.tz?.trim() || undefined,
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catch: false,
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});
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const next = cron.nextRun(new Date(nowMs));
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return next ? next.getTime() : undefined;
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}
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