How to use the apollo-server-koa.gql function in apollo-server-koa

// Build schema.
    const schema = makeExecutableSchema({
      typeDefs,
      resolvers,
    });

    if (!strapi.config.currentEnvironment.server.production) {
      // Write schema.
      this.writeGenerateSchema(graphql.printSchema(schema));
    }

    // Remove custom scaler (like Upload);
    typeDefs = Types.removeCustomScalar(typeDefs, resolvers);

    return {
      typeDefs: gql(typeDefs),
      resolvers,
    };
  },

// // Build schema.
    if (!strapi.config.currentEnvironment.server.production) {
      // Write schema.
      const schema = makeExecutableSchema({
        typeDefs,
        resolvers,
      });

      this.writeGenerateSchema(graphql.printSchema(schema));
    }

    // Remove custom scalar (like Upload);
    typeDefs = Types.removeCustomScalar(typeDefs, resolvers);

    return {
      typeDefs: gql(typeDefs),
      resolvers,
    };
  },

// Build schema.
    const schema = makeExecutableSchema({
      typeDefs,
      resolvers,
    });

    if (!strapi.config.currentEnvironment.server.production) {
      // Write schema.
      this.writeGenerateSchema(graphql.printSchema(schema));
    }

    // Remove custom scaler (like Upload);
    typeDefs = Types.removeCustomScalar(typeDefs, resolvers);

    return {
      typeDefs: gql(typeDefs),
      resolvers,
    };
  },