Types

Chain has its own runtime type system. In certain cases, notably with call definitions and defining parameters, you can supply optional types by appending a ?, but the Luau nil type is otherwise not allowed.

Type	Functionality
string	Any string (from Luau)
boolean	Any bool (from Luau)
number	Any number (from Luau)
thunk	An unevaluated call (Luau function)