preResolve hook

The preResolve hook is called before the Operation gets resolved. As it's not a "mutating" hook, you cannot use it to modify the input of the Operation. Supported operations are queries, mutations and subscriptions.

The main purpose of this hook is e.g. logging.

Similar to all other hooks, the preResolve hook is called with the following parameters:

• user: The user object when the user is authenticated
• clientRequest: The original client request object, including Headers
• log: The logger object
• operations: The operations client, used to call other (internal) operations
• internalClient: The internal client object, deprecated
• input: The input object (only for Operation hooks)

With the internalClient, you're able to securely call into all defined Operations, e.g. to talk to a database or another service to enrich a response or manipulate the inputs of an Operation.

// wundergraph.server.ts
export default configureWunderGraphServer(() => ({
  hooks: {
    queries: {
      Dragons: {
        preResolve: async ({ input, user, log, operations, internalClient, clientRequest }) => {
          log.info(`Pre-resolve hook called for Dragons with ${input}`);
        },
      },
    },
  },
}));