Apollo Gateway: Health Check: Schema Only

gateway-health-check-schema-only.js

import { ApolloGateway } from "@apollo/gateway";
import { ApolloServer } from "apollo-server";

(async function startApolloServer() {
  const gateway = new ApolloGateway({
    /* Options, maybe! */
  });

  const server: ApolloServer = new ApolloServer({
    gateway,
    subscriptions: false,
    onHealthCheck: () => server.executeOperation({ query: "{ __typename }" })
  });

  await server.listen();
})().catch(console.error);