What are the default/base values for the sizes property of the theme spec?

[JakeMetz8]

If the sizes property is not declared in theme what are the default sizes?

I cannot find this anywhere in the documentation nor does it look like the property is set in the base preset here

[lachlanjc]

There aren't any :) The default theme only defines space & fontSizes—check that out here—& the idea is you add your own sizes as a user.