schemaFiles
The schema files as either a ".json" introspection schema or a ".sdl|.graphqls" SDL schema. You might come across schemas named "schema.graphql", these are SDL schemas most of the time that need to be renamed to "schema.graphqls" to be recognized properly.
The compiler accepts multiple schema files in order to add extensions to specify key fields and other schema extensions.
By default, the plugin collects all "schema.json|sdl|graphqls" file in the source roots