Using stored queries in Apollo Server

apolloStoredQueries.js

import express from 'express';
import { apolloExpress, OperationStore } from 'apollo-server';
import Schema from './schema';

const PORT = 3000;
const store = new OperationStore(Schema);
store.put('query testquery{ testString }');
const app = express();

const options = {
  schema: Schema,
  formatParams(params) {
    params['query'] = store.get(params.operationName);
    if (!params['query']){
      throw new Error(`Only whitelisted queries are allowed. No query stored for ${params.operationName}`);
    }
    return params;
  }
};

app.use('/graphql', apolloExpress(options));

app.listen(PORT);