Name of the exported interface describing the generated client, and the factory's return type. Defaults to 'Api'.

The factory needs a written-out return type or JSR rejects the generated file as a slow type, which blocks .d.ts generation — so a consumer could not publish a package containing it. Naming the interface is also the only way a consumer can name the client's type at all.

Configure it when a component schema in the document is already called Api: every emitted type name is claimed from one registry, so the clash throws rather than emitting two declarations of one name.