@gospime/racer-backend/src/options.js

Create backend for Racer or Derby.js and add extensions

const shareDbMongo = require('sharedb-mongo');
const PubSub = require('sharedb-redis-pubsub');
const Redis = require('redis-url');

module.exports = settings => {
  const {
    uriMongo,
    uriRedis,
    uriRedisPubSub
  } = settings || {};

  return {
    db: shareDbMongo(uriMongo, {
      useUnifiedTopology: true
      // safe: true
      /**
       * Allow $while and $mapReduce queries. These queries let you run arbitrary JS on the server.
       * If users make these queries from the browser, there's security issues.
       */
      //, allowJSQueries: false
      // Aggregate queries are less dangerous, but you can use them to access any data in the mongo database.
      //, allowAggregateQueries: false
    }),
    pubsub: PubSub({
      client: Redis.connect(uriRedis),
      observer: Redis.connect(uriRedisPubSub)
    }),
    // DEPRECATED: "doc" middleware action. Use "readSnapshots" instead.
    // Pass `disableDocAction: true` option to ShareDB to disable the "doc" action and this warning.
    disableDocAction: true,
    // DEPRECATED: "after submit" middleware action. Use "afterSubmit" instead.
    // Pass `disableSpaceDelimitedActions: true` option to ShareDB to disable the "after submit" action and this warning.
    disableSpaceDelimitedActions: true
  };
};