callback function for onSchemaLoadOrUpdate when upgrading from AS v3 to AS v4

[simpyparveen]

Issue Description

I have a gateway defined as follows:

 const gateway: GraphQLService = {
        load: async () => (await {
            schema: server.systemSchema,
            executor: (args) => execute({
                ...args,
                schema: server.systemSchema,
                contextValue: args.context,
                variableValues: args.request.variables
            })
        } as GraphQLServiceConfig),
        stop: async () => {},
        onSchemaChange: (callback: SchemaChangeCallback) => {
            server.updateSchema = callback;
            return () => {};
        }
    };

**What will be the equivalent gateway in AS v4 ??**

    I made an attempt to do:
    const gateway: GatewayInterface = {
        load: async () => (await {
            schema: server.systemSchema,
            executor: (args) => execute({
                ...args,
                schema: server.systemSchema,
                contextValue: args.context,
                variableValues: args.request.variables
            })
        } as GatewayLoadResult),
        stop: async () => {},
        onSchemaLoadOrUpdate (callback) {
            callback({ apiSchema: schema } as any);
            return () => {};
        }
    };
   

But i get an error thrown when i update the server.  Potentially because I remove the line `server.updateSchema = callback;`. How should I perform server.updateSchema in modified gateway ???

Need aa solution.

Link to Reproduction

https://www.apollographql.com/docs/apollo-server/migration/#executor

Reproduction Steps

No response

[trevor-scheer]

Can you provide more details on the error? As far as I can tell, schema is undefined in the onSchemaLoadOrUpdate function, but there is a fair amount of context missing from the code so I can't be sure of much.

I can really only be more helpful if you provide a reproduction with detailed instructions on how to trigger the error. Happy to reopen this with a reproduction.

[simpyparveen]

@trevor-scheer
https://codesandbox.io/p/devbox/happy-lalande-cyzdyz?file=%2Fsrc%2Findex.ts%3A74%2C26

I tried to add same gateway by forking changing gateway of https://codesandbox.io/p/devbox/inspiring-microservice-j9p56m?file=%2Fsrc%2Findex.ts%3A53%2C10-53%2C24 (open-source)

[github-actions]

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