Add Source<T> export

src/init.luau

@@ -13,10 +13,11 @@ local derive = require(script.derive)
 local indexes, values = require(script.maps)()
 local spring, update_springs = require(script.spring)()
 local action = require(script.action)()
-
 local throw = require(script.throw)
 local flags = require(script.flags)
 
+export type Source<T> = source.Source<T>
+
 local vide = {
     -- core
     create = create,

src/source.luau

@@ -6,7 +6,7 @@ local create = graph.create
 local set = graph.set
 
 
-type Source<T> = (() -> T) & ((T) -> T)
+export type Source<T> = (() -> T) & ((T) -> T)
 
 local function source<T>(value: T): Source<T>
     local node, get_value = create(value :: T)