Home-rolled apollo check

Apollo is awesome! But, why pay for apollo-checks? This repo is a PoC for home-rolling apollo-checks. It covers one use case: removing a field. It doesn't check changes field value changes (i.e., changes to the type of the value rather than just straight removal of the value), and it doesn't do any kind of sampling.

Up and running

To run the federated services and gateway, do the following:

• yarn to install the dependencies,
• yarn start-services to start the services,
• and, in a different terminal, yarn start-gateway to kick on the gateway

Demonstrating a breaking change

Querying the federated services

To demonstrate a breaking change, first you must make a query. Go to localhost:4000 and query the following:

query {
  topProducts {
    upc
    name
  }
}

You now have a query saved in a file that we'll use for checking schema changes.

Changing the schema

Make a breaking change! Go to products/schema.graphql.ts and remove the name field from the schema. If all goes well, you'll see Error: breaking schema change: field queryType actively used, but has been removed.