p-limit
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Run multiple promise-returning & async functions with limited concurrency
$ npm install p-limit
import pLimit from 'p-limit';
const limit = pLimit(1);
const input = [
limit(() => fetchSomething('foo')),
limit(() => fetchSomething('bar')),
limit(() => doSomething())
];
// Only one promise is run at once
const result = await Promise.all(input);
console.log(result);
Returns a limit
function.
Type: number
Minimum: 1
Default: Infinity
Concurrency limit.
Returns the promise returned by calling fn(...args)
.
Type: Function
Promise-returning/async function.
Any arguments to pass through to fn
.
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.
The number of promises that are currently running.
The number of promises that are waiting to run (i.e. their internal fn
was not called yet).
Discard pending promises that are waiting to run.
This might be useful if you want to teardown the queue at the end of your program's lifecycle or discard any function calls referencing an intermediary state of your app.
Note: This does not cancel promises that are already running.
p-queue
package?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.
FAQs
Run multiple promise-returning & async functions with limited concurrency
The npm package p-limit receives a total of 82,554,544 weekly downloads. As such, p-limit popularity was classified as popular.
We found that p-limit demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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