...Use .get or .post (or both) rather than .use to configure your route handler. If you want to show GraphiQL in the browser, set graphiql, true on your .get handler. An optional function for adding additional metadata to the GraphQL response as a key-value object is provided. The result will be added to the "extensions" field in the resulting JSON. This is often a useful place to add development time metadata such as the runtime of a query or the amount of resources consumed. This may be an async function. The function is given one object as an argument: { document, variables, operationName, result, context }.