EnvironmentKey is class that can be used to match up a Relay Environment registered with
<RecoilRelayEnvironment> in your
<RecoilRoot> with a GraphQL selector or atom effect that uses it to query.
const myEnvironmentKey = new EnvironmentKey('My Environment');
EnvironmentKey to register Relay Environments instead of just specifying the Relay Environment direclty in the query can be useful if the environment is only known at render time.