Commits on Jul 23, 2021

1. Support gateways without executors …

   Previously gateways could express their executor in two ways: as the
   executor method (required to exist!) and as part of the return value
   from load (which was ignored!).
   
   Now we just return it from load, and allow it to be null.
   
   This supports a mocking use case. Fixes #5518. It lets you do something
   like:
   
       import { addMocksToSchema } from '@graphql-tools/mock';
       const realGateway = new ApolloGateway();
       const gateway: GatewayInterface = {
         async load(options) {
           const { schema } = await realGateway.load(options);
           return {
             schema: addMocksToSchema({ schema }),
             executor: null,
           };
         }
         stop() {
           return realGateway.stop();
         }
         onSchemaLoadOrUpdate(callback) {
           return realGateway.onSchemaLoadOrUpdate(callback);
         }
       };
       const server = new ApolloServer({ gateway });
   
   to define a server that follows a managed federation graph but executes
   queries using mocking.

   

   glasser committed Jul 23, 2021
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