es6/util/UnsubscriptionError.js

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