is-async-function
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Package description
The is-async-function npm package is designed to help developers determine if a given function is an asynchronous function. This can be particularly useful in scenarios where the behavior of code needs to be altered based on whether a function is asynchronous or not, such as in dynamic function execution, middleware handling, or in libraries that need to support both synchronous and asynchronous operations.
Checking if a function is asynchronous
This feature allows you to check if a given function is an async function. The package exports a single function that takes one argument (the function to check) and returns a boolean indicating whether the function is asynchronous. This is useful for dynamically handling functions based on their nature.
const isAsyncFunction = require('is-async-function');
async function foo() {};
console.log(isAsyncFunction(foo)); // true
function bar() {};
console.log(isAsyncFunction(bar)); // falseThe is-promise package checks if a value is a Promise, which is a related but different check compared to is-async-function. While is-async-function checks the nature of the function itself, is-promise checks the return value of a function to determine if it's a Promise. This distinction is crucial in understanding and handling asynchronous operations in JavaScript.
kind-of is a more general utility for checking the type of a value in JavaScript, which includes support for identifying functions and promises among many other types. Compared to is-async-function, kind-of offers a broader range of type checks but does not specifically focus on distinguishing between synchronous and asynchronous functions. It's more versatile but less specialized.
Changelog
Readme
Is this a native async function?
var isAsyncFunction = require('is-async-function');
assert(!isAsyncFunction(function () {}));
assert(!isAsyncFunction(null));
assert(!isAsyncFunction(function* () { yield 42; return Infinity; }));
assert(isAsyncFunction(async function () {}));
Simply clone the repo, npm install, and run npm test
FAQs
Determine if a function is a native async function.
The npm package is-async-function receives a total of 9,428,728 weekly downloads. As such, is-async-function popularity was classified as popular.
We found that is-async-function demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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