Function writeResponse

src/utils.ts:171–216

(
  writeable: Duplex | ServerResponse,
  httpCode: keyof typeof codes,
  message: string | Error,
  contentType: contentTypes = contentTypes.text,
)

  isHTTP(connection) ? !!connection.socket?.writable : !!connection.writable;

export const writeResponse = (
  writeable: Duplex | ServerResponse,
  httpCode: keyof typeof codes,
  message: string | Error,
  contentType: contentTypes = contentTypes.text,
): void => {
  if (!isConnected(writeable)) {
    return;
  }

  const isJSON = contentType.includes(contentTypes.json);
  const isError = httpCode >= 400;
  const httpMessage = codes[httpCode];
  const CTTHeader = contentType.toLowerCase().includes('charset=')
    ? contentType
    : `${contentType}; charset=${encodings.utf8}`;
  const body =
    isJSON && isError
      ? JSON.stringify({
          error: message instanceof Error ? message.message : message,
        })
      : message;

  if (isHTTP(writeable)) {
    const response = writeable;
    if (!response.headersSent) {
      response.writeHead(httpMessage.code, { 'Content-Type': CTTHeader });
      response.end(body + '\n');
    }
    return;
  }

  const httpResponse = [
    httpMessage.message,
    `Content-Type: ${CTTHeader}`,
    'Content-Encoding: UTF-8',
    'Accept-Ranges: bytes',
    'Connection: keep-alive',
    '\r\n',
    body,
  ].join('\r\n');

  writeable.write(httpResponse);
  writeable.end();
  return;
};

export const jsonResponse = (
  response: ServerResponse,