commerce/lib/sfcc/type-guards.ts

export interface SFCCErrorLike {
  _v?: string;
  fault?: {
    arguments?: unknown;
    type?: string;
    message?: string;
  };
}

export const isObject = (object: unknown): object is Record<string, unknown> => {
  return typeof object === 'object' && object !== null && !Array.isArray(object);
};

export const isSFCCError = (error: unknown): error is SFCCErrorLike => {
  console.log({ error });
  if (!isObject(error)) return false;

  if (error instanceof Error) return true;

  return findError(error);
};

function findError<T extends object>(error: T): boolean {
  if (Object.prototype.toString.call(error) === '[object Error]') {
    return true;
  }

  const prototype = Object.getPrototypeOf(error) as T | null;

  return prototype === null ? false : findError(prototype);
}