@reactivex/rxjs/src/util/UnsubscriptionError.ts

Reactive Extensions for modern JavaScript

/**
 * An error thrown when one or more errors have occurred during the
 * `unsubscribe` of a {@link Subscription}.
 */
export class UnsubscriptionError extends Error {
  constructor(public errors: any[]) {
    super();
    this.name = 'UnsubscriptionError';
    this.message = errors ? `${errors.length} errors occurred during unsubscription:
${errors.map((err, i) => `${i + 1}) ${err.toString()}`).join('\n')}` : '';
  }
}