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Recron is a simple, intuitive and readable cron implementaiton written in TypeScript and suitable for Node.js and browser usage.
import { Cron } from 'recron';
const cron = new Cron();
// Start cron scheduler.
cron.start();
// Use interval syntax.
cron.schedule('@every 1s', () => {
console.log('every second', new Date());
});
// Use crontab syntax.
cron.schedule('*/5 * * * * *', () => {
console.log('at 5th second', new Date());
});
// Stop cron after 10 seconds.
cron.schedule(
'@every 10s',
() => {
cron.stop();
console.log('done', new Date());
},
{ oneshot: true }
);
The constructor of Cron
has an optional parameter to let you set time zone.
If the timezone
parameter is unspecified, the default time zone will be detected from Intl.DateTimeFormat
, it will be your local time zone in general.
Also, the last parameter of schedule()
method options
has an optional timezone
property,
which can be used to override the default time zone for individual schedule.
Note: time zone only affects crontab, it does not affect the interval usage.
Unlike other cron implementations,
reentrant is not allowd in recron
by default for both safety and convenient.
Therefore, if the scheduled callback function takes a lot of time to process, it will underrun.
For example, given following piece of code:
const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
cron.schedule('@every 1s', async () => {
console.log('overslept', new Date());
await sleep(3000);
});
the output will be:
overslept 2019-10-31T05:05:27.251Z
overslept 2019-10-31T05:05:30.253Z
overslept 2019-10-31T05:05:34.254Z
overslept 2019-10-31T05:05:37.263Z
overslept 2019-10-31T05:05:40.275Z
To disable this feature, set reentrant
to true
in options.
But be careful, if the providered callback function keeps underrun,
due to the unresolved promises,
the memory consumption will be increasing,
and eventually you program will run out-of-memory.
recron
has following crontab aliases:
Alias | Crontab |
---|---|
@hourly | 0 * * * * |
@daily | 0 0 * * * |
@weekly | 0 0 * * 1 |
@monthly | 0 0 1 * * |
Note: we regard Monday as the first day of the week according to international standard ISO 8601. So @weekly
means "at 00:00 on Monday", not Sunday.
Interval syntax has following specifiers:
Order | Specifier | Unit |
---|---|---|
1 | h | hour |
2 | m | minute |
3 | s | second |
4 | ms | Millisecond |
One ore more specifiers can be used, as long as they are arranged in ascending order:
@every 10s
@every 30m
@every 1h30m
FAQs
Simple, intuitive and readable cron implementaiton
The npm package recron receives a total of 10 weekly downloads. As such, recron popularity was classified as not popular.
We found that recron demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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