AggregateError

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2020.

The AggregateError object represents an error when several errors need to be wrapped in a single error. It is thrown when multiple errors need to be reported by an operation, for example by Promise.any(), when all promises passed to it reject.

Compared to SuppressedError, AggregateError represents a list of unrelated errors, while SuppressedError represents an error that happened during the handling of another error.

AggregateError is a subclass of Error.

Constructor

AggregateError()

Creates a new AggregateError object.

Instance properties

Also inherits instance properties from its parent Error.

These properties are defined on AggregateError.prototype and shared by all AggregateError instances.

AggregateError.prototype.constructor

The constructor function that created the instance object. For AggregateError instances, the initial value is the AggregateError constructor.

AggregateError.prototype.name

Represents the name for the type of error. For AggregateError.prototype.name, the initial value is "AggregateError".

These properties are own properties of each AggregateError instance.

errors

An array representing the errors that were aggregated.

js
Promise.any([Promise.reject(new Error("some error"))]).catch((e) => {
  console.log(e instanceof AggregateError); // true
  console.log(e.message); // "All Promises rejected"
  console.log(e.name); // "AggregateError"
  console.log(e.errors); // [ Error: "some error" ]
});

Creating an AggregateError

js
try {
  throw new AggregateError([new Error("some error")], "Hello");
} catch (e) {
  console.log(e instanceof AggregateError); // true
  console.log(e.message); // "Hello"
  console.log(e.name); // "AggregateError"
  console.log(e.errors); // [ Error: "some error" ]
}