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set-delayed-interval

v1.0.0

Published

An asynchronous setInterval that is properly delayed using promises and can be delayed on boot

Downloads

10,785

Readme

set-delayed-interval

Build Status dependencies Status JavaScript Style Guide

An asynchronous setInterval that is properly delayed using promises and can be delayed on boot

Motivation

The native implementation of setInterval expects synchronous functions to be executed. When asynchronous functions are provided, some unexpected behaviors might appear. This module mimics the setInterval native functionality with support for promises in a way that the interval timer is delayed by the execution of that promise. This results in equal stop times for each run, as soon as the promise is resolved.

For some scenarios, it is useful to add a start delay before running a recurrent task. This module also supports a custom delay before the interval starts. The clearDelayedInterval can stop both the initial delay and the interval.

Install

npm i set-delayed-interval

Usage

const { setDelayedInterval, clearDelayedInterval } = require('set-delayed-interval')

const task = async () => {
  /// ....
}

// After 100ms, run the task recurrently with 50ms intervals
const id = setDelayedInterval(task, 50, 100)

// ...
clearDelayedInterval(id)

API

setDelayedInterval

Parameters

| Name | Type | Description | |--------|------|-------------| | task | () => Promise | recurrent task to run | | interval | number | interval between each task (in ms) | | [delay] | number | delay before first run (in ms). Defaults to interval. |

Returns

| Type | Description | |------|-------------| | string | interval id |

clearDelayedInterval

Parameters

| Name | Type | Description | |--------|------|-------------| | id | string | interval id to clear |

Error Handling

This module throws task errors on the global context. For handling your tasks errors, it is recommended to wrap the task async code with a try catch block, or your can catch the global errors with process.once('uncaughtException', (err) => {}) in Node.js or window.onerror = (err) => {} in the browser.

Contribute

Feel free to dive in! Open an issue or submit PRs.

License

MIT © Vasco Santos