merge-schemas.js

import { mergeSchemas } from 'graphql-tools';  
  
const makeMergedSchema = async () => {

  const userSchema = await createRemoteExecutableSchema();
  const customResolver = makeCustomResolver(userSchema);

  // merge the two schemas
  const mergedSchema = mergeSchemas({
    schemas: [userSchema],
    resolvers: customResolver,
  });

  return mergedSchema;

};