diff --git a/src/shared/types/class.lua b/src/shared/types/class.lua
new file mode 100644
index 0000000..43c4e66
--- /dev/null
+++ b/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))
\ No newline at end of file