AggregateError

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.

Constructor

AggregateError(): Creates a new AggregateError object.

Instance properties

AggregateError.prototype.message: Error message, defaults to "".
AggregateError.prototype.name: Error name, defaults to AggregateError.
AggregateError: errors: An array that essentially reflects the iterable with which the AggregateError was instantiated; for example, if the AggregateError was created using the AggregateError() constructor, an array produced from whatever iterable was passed to the constructor as its first argument.

Examples

Catching an AggregateError

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

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" ]
}

Specifications

Specification
ECMAScript Language Specification (ECMAScript) # sec-aggregate-error-objects

Browser compatibility

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