Produced by fields.optional(...) -- recognized only during buildData's schema-authoring walk; the resolved runtime default is always undefined.
fields.optional(...)
buildData
undefined
Readonly
Internal marker discriminant -- see the module doc comment.
The declared inner default, kept only so the underlying type can be inferred -- never the resolved runtime value.
Produced by
fields.optional(...)-- recognized only duringbuildData's schema-authoring walk; the resolved runtime default is alwaysundefined.