fig-6.js

const defaultStatusCodes = new Set([400, 401, 403, 404, 422, 500, 502, 504]);

class CustomError extends Error {
  constructor(statusCode: number, { key, message, payload }) {
    super(message);
    if (!defaultStatusCodes.has(statusCode)) {
      throw new Error(`No integration response associated with statusCode ${statusCode}`);
    }
    ...
  }
}