[chore] convert remaining type aliases#2018

Merged

benmccann merged 4 commits intosveltejs:masterfrom ignatiusmb:interfaces

Jul 28, 2021

+61-57

Commits on Jul 26, 2021

convert remaining public type aliases to interface
ignatiusmb
committed

Commits on Jul 27, 2021

Commits on Jul 28, 2021

rename Index to Rec
ignatiusmb
committed