bdde081050
Added test to ensure that release notes are parsed properly Updated to latest dependencies to fix security vulnerability Updated GH Actions Workflow to run test before updating tag Updated README.md to reflect proper whatsnew documentation.
94 lines
2.5 KiB
Markdown
94 lines
2.5 KiB
Markdown
# p-limit [](https://travis-ci.org/sindresorhus/p-limit)
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> Run multiple promise-returning & async functions with limited concurrency
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## Install
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```
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$ npm install p-limit
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```
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## Usage
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```js
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const pLimit = require('p-limit');
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const limit = pLimit(1);
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const input = [
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limit(() => fetchSomething('foo')),
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limit(() => fetchSomething('bar')),
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limit(() => doSomething())
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];
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(async () => {
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// Only one promise is run at once
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const result = await Promise.all(input);
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console.log(result);
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})();
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```
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## API
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### pLimit(concurrency)
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Returns a `limit` function.
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#### concurrency
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Type: `number`\
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Minimum: `1`\
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Default: `Infinity`
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Concurrency limit.
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### limit(fn, ...args)
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Returns the promise returned by calling `fn(...args)`.
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#### fn
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Type: `Function`
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Promise-returning/async function.
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#### args
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Any arguments to pass through to `fn`.
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Support for passing arguments on to the `fn` is provided in order to be able to avoid creating unnecessary closures. You probably don't need this optimization unless you're pushing a *lot* of functions.
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### limit.activeCount
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The number of promises that are currently running.
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### limit.pendingCount
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The number of promises that are waiting to run (i.e. their internal `fn` was not called yet).
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## FAQ
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### How is this different from the [`p-queue`](https://github.com/sindresorhus/p-queue) package?
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This package is only about limiting the number of concurrent executions, while `p-queue` is a fully featured queue implementation with lots of different options, introspection, and ability to pause the queue.
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## Related
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- [p-queue](https://github.com/sindresorhus/p-queue) - Promise queue with concurrency control
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- [p-throttle](https://github.com/sindresorhus/p-throttle) - Throttle promise-returning & async functions
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- [p-debounce](https://github.com/sindresorhus/p-debounce) - Debounce promise-returning & async functions
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- [p-all](https://github.com/sindresorhus/p-all) - Run promise-returning & async functions concurrently with optional limited concurrency
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- [More…](https://github.com/sindresorhus/promise-fun)
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---
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<div align="center">
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<b>
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<a href="https://tidelift.com/subscription/pkg/npm-p-limit?utm_source=npm-p-limit&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
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</b>
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<br>
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<sub>
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Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
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</sub>
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</div>
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