async | Async utilities for node and the browser | Reactive Programming library

 by   caolan JavaScript Version: 3.2.5 License: MIT

kandi X-RAY | async Summary

kandi X-RAY | async Summary

async is a JavaScript library typically used in Programming Style, Reactive Programming, React, Webpack, Nodejs applications. async has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub, Maven.

Async is a utility module which provides straight-forward, powerful functions for working with asynchronous JavaScript. Although originally designed for use with Node.js and installable via npm i async, it can also be used directly in the browser. A ESM/MJS version is included in the main async package that should automatically be used with compatible bundlers such as Webpack and Rollup. A pure ESM version of Async is available as async-es. For Documentation, visit

            kandi-support Support

              async has a medium active ecosystem.
              It has 27877 star(s) with 2454 fork(s). There are 670 watchers for this library.
              There were 1 major release(s) in the last 6 months.
              There are 12 open issues and 1101 have been closed. On average issues are closed in 74 days. There are 12 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of async is 3.2.5

            kandi-Quality Quality

              async has 0 bugs and 0 code smells.

            kandi-Security Security

              async has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              async code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              async is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              async releases are available to install and integrate.
              Deployable package is available in Maven.
              Installation instructions are not available. Examples and code snippets are available.
              async saves you 346 person hours of effort in developing the same functionality from scratch.
              It has 829 lines of code, 0 functions and 170 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed async and discovered the below as its top functions. This is intended to give you an instant insight into async implemented functionality, and help decide if they suit your requirements.
            • Executes a set of tasks in parallel
            • Queue task queue
            • Creates a new benchmark object
            • Async iterator function .
            • Retry a task
            • loop for each element
            • Pushes task queue
            • Injects the passed functions into an array of functions that are passed to the callback function .
            • build member navigation
            • Insert new data into the queue
            Get all kandi verified functions for this library.

            async Key Features

            No Key Features are available at this moment for async.

            async Examples and Code Snippets

            Clear async errors .
            pythondot img1Lines of Code : 21dot img1License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def async_clear_error():
              """Clear pending operations and error statuses in async execution.
              In async execution mode, an error in op/function execution can lead to errors
              in subsequent ops/functions that are scheduled but not yet executed. Call  
            Synchronously wait for async execution .
            pythondot img2Lines of Code : 14dot img2License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def async_wait():
              """Sync all async operations and raise any errors during execution.
              In async execution mode, an op/function call can return before finishing the
              actual execution. Calling this method creates a synchronization barrier for
            Check if the context is async .
            pythondot img3Lines of Code : 3dot img3License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def is_async():
              """Returns true if current thread is in async mode."""
              return context().is_async()  

            Community Discussions


            Cannot read properties of undefined (reading 'transformFile') at Bundler.transformFile
            Asked 2022-Mar-29 at 12:36

            I have updated node today and I'm getting this error:



            Answered 2021-Oct-27 at 17:19

            Ran into the same issue with Node.js 17.0.0. To solve it, I downgraded to version 14.18.1, deleted node_modules and reinstalled.



            Failed to load next.config.js
            Asked 2022-Mar-11 at 12:03

            After cloning the repository I created and set my .env.local file, ran npm i then ran npm run dev. The server starts, env is loaded from .env.local however it immediately fails prompting me with the following:



            Answered 2021-Oct-30 at 20:21

            I solved this by upgrading to the latest version of nodeJS



            Error when trying to run my React Native app on Android
            Asked 2022-Mar-06 at 07:58

            I've built my React Native app and tested and troubleshooted with my iOS devices for months. Now I'm trying to built and test the app on Android for the first time. The thing is, that I keep getting errors trying to run the Android-version of my app. After hours of debugging and troubleshooting, I tried to create a new RN project and see if that could run on my emulator and device. I got that part working and then I wanted to copy/paste the files of my existing app project into the new project.

            I pasted my existing assets, styles, the source JS-files and the package.json file into the new project, ran npm install and then I ended up with the exact same error message as I had in the original project when I run react-native run-android.

            The full error message is here:



            Answered 2021-Aug-21 at 13:43

            I've hit this same issue and have temporarily resolved it by uninstalling react-native-video (npm uninstall --save react-native-video). That's not a great answer as I need that component, but I don't have a full solution yet. I think somehow com.yqritc:android-scalablevideoview:1.0.4. is required by react-native-video but has gotten lost or removed. Other thoughts are welcome.

            UPDATE: Resolved! In your build.gradle in your Android folder you need to add the repository "jcenter()" in allprojects (not in build dependencies) like this...



            What is the built-in `#[main]` attribute?
            Asked 2022-Feb-15 at 23:57

            I have been using the #[tokio::main] macro in one of my programs. After importing main and using it unqualified, I encountered an unexpected error.



            Answered 2022-Feb-15 at 23:57

            #[main] is an old, unstable attribute that was mostly removed from the language in 1.53.0. However, the removal missed one line, with the result you see: the attribute had no effect, but it could be used on stable Rust without an error, and conflicted with imported attributes named main. This was a bug, not intended behaviour. It has been fixed as of nightly-2022-02-10 and 1.59.0-beta.8. Your example with use tokio::main; and #[main] can now run without error.

            Before it was removed, the unstable #[main] was used to specify the entry point of a program. Alex Crichton described the behaviour of it and related attributes in a 2016 comment on GitHub:

            Ah yes, we've got three entry points. I.. think this is how they work:

            • First, #[start], the receiver of int argc and char **argv. This is literally the symbol main (or what is called by that symbol generated in the compiler).
            • Next, there's #[lang = "start"]. If no #[start] exists in the crate graph then the compiler generates a main function that calls this. This functions receives argc/argv along with a third argument that is a function pointer to the #[main] function (defined below). Importantly, #[lang = "start"] can be located in a library. For example it's located in the standard library (libstd).
            • Finally, #[main], the main function for an executable. This is passed no arguments and is called by #[lang = "start"] (if it decides to). The standard library uses this to initialize itself and then call the Rust program. This, if not specified, defaults to fn main at the top.

            So to answer your question, this isn't the same as #[start]. To answer your other (possibly not yet asked) question, yes we have too many entry points.



            Error [ERR_REQUIRE_ESM]: require() of ES Module not supported
            Asked 2022-Feb-03 at 22:08

            I'm trying to make a Discord bot that just says if someone is online on the game.

            However I keep getting this message:

            [ERR_REQUIRE_ESM]: require() of ES Module from not supported. Instead change the require of index.js in... to a dynamic import() which is available in all CommonJS modules.

            This is my code:



            Answered 2021-Sep-07 at 06:38

            node-fetch v3 recently stopped support for the require way of importing it in favor of ES Modules. You'll need to use ESM imports now, like:



            How to prevent actor reentrancy resulting in duplicative requests?
            Asked 2022-Jan-21 at 06:56

            In WWDC 2021 video, Protect mutable state with Swift actors, they provide the following code snippet:



            Answered 2022-Jan-05 at 00:30

            The key is to keep a reference to the Task, and if found, await its value.




            Why does the thread sanitizer complain about acquire/release thread fences?
            Asked 2022-Jan-04 at 16:06

            I'm learning about different memory orders.

            I have this code, which works and passes GCC's and Clang's thread sanitizers:



            Answered 2022-Jan-04 at 16:06

            The thread sanitizer currently doesn't support std::atomic_thread_fence. (GCC and Clang use the same thread sanitizer, so it applies to both.)

            GCC 12 (currently trunk) warns about it:



            FirebaseOptions cannot be null when creating the default app
            Asked 2021-Dec-25 at 09:13

            I am trying to try a sample project in Flutter integration email and google based login, and planning to use firebase initialisation for doing it while I have followed all the steps as mentioned in tutorials I am getting this error as soon as firebase is attempted to be initialised.



            Answered 2021-Dec-25 at 09:13


            For your firebase_core version is seems to be sufficient to pass the FirebaseOptions once you initialize firebase in your flutter code (and you don't need any script tags in your index.html):



            How can I get values from input components (study purposes)?
            Asked 2021-Dec-16 at 00:53

            My problem is that I'm trying to handle the value of my inputs, which the user defines which input he wants, by an API call.

            Here is where I get the values :



            Answered 2021-Dec-10 at 13:32

            It was a bit hacky so I simplified it, I think you should understand the logic behind it.



            Ping Tasks will not complete
            Asked 2021-Nov-30 at 13:11

            I am working on a "heartbeat" application that pings hundreds of IP addresses every minute via a loop. The IP addresses are stored in a list of a class Machines. I have a loop that creates a Task (where MachinePingResults is basically a Tuple of an IP and online status) for each IP and calls a ping function using System.Net.NetworkInformation.

            The issue I'm having is that after hours (or days) of running, one of the loops of the main program fails to finish the Tasks which is leading to a memory leak. I cannot determine why my Tasks are not finishing (if I look in the Task list during runtime after a few days of running, there are hundreds of tasks that appear as "awaiting"). Most of the time all the tasks finish and are disposed; it is just randomly that they don't finish. For example, the past 24 hours had one issue at about 12 hours in with 148 awaiting tasks that never finished. Due to the nature of not being able to see why the Ping is hanging (since it's internal to .NET), I haven't been able to replicate the issue to debug.

            (It appears that the Ping call in .NET can hang and the built-in timeout fail if there is a DNS issue, which is why I built an additional timeout in)

            I have a way to cancel the main loop if the pings don't return within 15 seconds using Task.Delay and a CancellationToken. Then in each Ping function I have a Delay in case the Ping call itself hangs that forces the function to complete. Also note I am only pinging IPv4; there is no IPv6 or URL.

            Main Loop



            Answered 2021-Nov-26 at 08:37

            There are quite a few gaps in the code posted, but I attempted to replicate and in doing so ended up refactoring a bit.

            This version seems pretty robust, with the actual call to SendAsync wrapped in an adapter class.

            I accept this doesn't necessarily answer the question directly, but in the absence of being able to replicate your problem exactly, offers an alternative way of structuring the code that may eliminate the problem.


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install async

            You can download it from GitHub, Maven.


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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