AsyncFunction
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2017.
The AsyncFunction object provides methods for async functions. In JavaScript, every async function is actually an AsyncFunction object.
Note that AsyncFunction is not a global object. It can be obtained with the following code:
const AsyncFunction = async function () {}.constructor;
AsyncFunction is a subclass of Function.
Constructor
AsyncFunction()-
Creates a new
AsyncFunctionobject.
Instance properties
Also inherits instance properties from its parent Function.
These properties are defined on AsyncFunction.prototype and shared by all AsyncFunction instances.
AsyncFunction.prototype.constructor-
The constructor function that created the instance object. For
AsyncFunctioninstances, the initial value is theAsyncFunctionconstructor. AsyncFunction.prototype[Symbol.toStringTag]-
The initial value of the
[Symbol.toStringTag]property is the string"AsyncFunction". This property is used inObject.prototype.toString().
Note:
AsyncFunction instances do not have the prototype property.
Instance methods
Inherits instance methods from its parent Function.
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-async-function-objects |
Browser compatibility
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