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To alter the HTTP response type within the handleError hook in SvelteKit, you can use the response parameter and set its headers property to include the desired Content-Type.

For example:

export function handleError({ error, request, resolve, response }) {
  // log the error
  console.error(error);

  // set the response content type to JSON
  response.headers["Content-Type"] = "application/json";

  // return the error as a JSON response
  return resolve({
    status: 500,
    body: { error: error.message }
  });
}

In this example, we set the Content-Type header to application/json to indicate that the response should be in JSON format. Then, we return a JSON response with the error message as the body.