shared types prototyping

metatables

src/shared/types/class.lua

@@ -0,0 +1,11 @@
+-- type AccountImpl = {
+--     __index: AccountImpl,
+--     new: (name: string, balance: number) -> Account,
+--     deposit: (self: Account, credit: number) -> (),
+--     withdraw: (self: Account, debit: number) -> (),
+-- }
+
+-- type Account = typeof(setmetatable({} :: { name: string, balance: number }, {} :: AccountImpl))
+
+type hself<T,U> = {__index: T} & U
+export type constructor<T,U> = typeof(setmetatable({} :: T & hself<T,U>, {} :: U))