[chore] convert remaining type aliases#2018

Merged

benmccann merged 4 commits intosveltejs:masterfrom ignatiusmb:interfaces

Jul 28, 2021

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