Prisma requires a replicaset for mongo in order to function even in development. This enforces transactional updates in development environments to avoid introducing unexpected behavior when moving to a production environment
mongod --port=27017 --dbpath=./data/db --replSet=rs0
mongo
rs.initiate( { _id : "rs0", members: [ { _id: 0, host: "localhost:27017" } ] })
mongodb://localhost:27017