fix(types): fix toUnion signature to correctly infer type

norskeld · Jan 14, 2023 · 4dca5e0 · 4dca5e0 · vercel · Jan 14, 2023
1 parent b1f48f1
commit 4dca5e0
Showing 1 changed file with 3 additions and 1 deletion.
diff --git 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