BetaOptional BetaaliasOptional Betastrictstrict: false allows unknown properties in the schema.
Use this when adding customizations to the schema that are not part of sanity core.
If you want to extend the Sanity Schema types with your own properties or options to make them typesafe, you can use TypeScript declaration merging.
See defineType for more.
Should be provided when type is a non-intrinsic type, ie type is a type alias