Ignore Field directive for Schema Stitching

[zawadzkip]

I'm new to making directives but I'm interested in trying to make one for ignoring certain fields from appearing in the Gateway stitched schema.

For example, a subschema may have a "ping" field on the Query type that I would want to ignore from stitching into the gateway schema. I understand I can use the rootFieldFilter to try and filterSchema but I was hoping to see if there is a way a subschema could define what fields they want the gateway to ignore.

Is this an idea worth exploring? What would be the best way to get started writing my own directive? I'm assuming the transformer and typedef for the directive would need to exist both on the gateway and the subschema