Javascript APIError class based on RFC7807

APIError.ts

import type { Problem } from './Problem'

/**
 * Javascript error class based on RFC7807.
 * @link https://www.rfc-editor.org/rfc/rfc7807
 */
export class APIError extends Error implements Problem {
  type: string;
  title?: string;
  status?: number;
  detail?: string;
  instance?: string;

  constructor(details: Problem) {
    super([details.title, details.detail].join('\n'));

    this.type = details.type ?? 'about:blank';
    this.title = details.title;
    this.status = details.status;
    this.detail = details.detail;
    this.instance = details.instance;
  }
}

Problem.ts

/**
 * Interface for a RFC7807 Problem Details Object.
 * @see https://www.rfc-editor.org/rfc/rfc7807
 */
export interface Problem {
  /**
   * A URI reference [RFC3986] that identifies the problem type. This specification encourages that, when dereferenced, it provide human-readable documentation for the problem type (e.g., using HTML [W3C.REC-html5-20141028]). When this member is not present, its value is assumed to be "about:blank".
   */
  type?: string;

  /**
   * A short, human-readable summary of the problem type. It SHOULD NOT change from occurrence to occurrence of the problem, except for purposes of localization (e.g., using proactive content negotiation; see [RFC7231, Section 3.4]).
   */
  title?: string;

  /**
   * The HTTP status code ([RFC7231], Section 6) generated by the origin server for this occurrence of the problem.
   */
  status?: number;

  /**
   * A human-readable explanation specific to this occurrence of the problem.
   */
  detail?: string;

  /**
   * A URI reference that identifies the specific occurrence of the problem. It may or may not yield further information if dereferenced.
   */
  instance?: string;
}