  We introduce the category of Heyting frames and show that it is equivalent to
the category of Heyting algebras and dually equivalent to the category of
Esakia spaces. This provides a frame-theoretic perspective on Esakia duality
for Heyting algebras. We also generalize these results to the setting of
Brouwerian algebras and Brouwerian semilattices by introducing the
corresponding categories of Brouwerian frames and extending the above
equivalences and dual equivalences. This provides a frame-theoretic perspective
on generalized Esakia duality for Brouwerian algebras and Brouwerian
semilattices.
