From 4dca5e0f7adb876ef0aa8bc7378a5bdca1affdcd Mon Sep 17 00:00:00 2001
From: Danil Tarasov <thefedaikin@gmail.com>
Date: Sat, 14 Jan 2023 10:20:47 +0300
Subject: [PATCH] fix(types): fix toUnion signature to correctly infer type

---
 src/types.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/types.ts b/src/types.ts
index e366f97..d60d5ec 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -54,7 +54,9 @@ export type ToTuple<T> = T extends [Parser<infer Head>, ...infer Tail]
  * type R = ToUnion<U> // type R = string | number | boolean
  * ```
  */
-export type ToUnion<T> = T extends [Parser<infer Head>, ...infer Tail]
+export type ToUnion<T> = T extends Array<Parser<infer Inner>>
+  ? Inner
+  : T extends [Parser<infer Head>, ...infer Tail]
   ? Head | ToUnion<Tail>
   : never