import std.meta : AliasSeq;
interface I1 { }
interface I2 { }
interface I12 : I1, I2 { }
static assert(is(BaseTypeTuple!I12 == AliasSeq!(I1, I2)));
interface I3 : I1 { }
interface I123 : I1, I2, I3 { }
static assert(is(BaseTypeTuple!I123 == AliasSeq!(I1, I2, I3)));
Get a AliasSeq of the base class and base interfaces of this class or interface. BaseTypeTuple!Object returns the empty type tuple.