Add Effect.fn.Return to allow typing returns on Effect.fn (#5631)

Author: mikearnaldi

.changeset/full-sides-decide.md

@@ -0,0 +1,5 @@
+---
+"effect": minor
+---
+
+Add Effect.fn.Return to allow typing returns on Effect.fn

packages/effect/src/Effect.ts

@@ -13946,6 +13946,11 @@ export declare namespace Service {
  * @category Models
  */
 export namespace fn {
+  /**
+   * @since 3.19.0
+   * @category Models
+   */
+  export type Return<A, E = never, R = never> = Generator<YieldWrap<Effect<any, E, R>>, A, any>
   /**
    * @since 3.11.0
    * @category Models