From 2e3ae207c2b367cdadcfbf4178d372917bdbffc3 Mon Sep 17 00:00:00 2001
From: Josh Rosenstein <32781407+JoshRosenstein@users.noreply.github.com>
Date: Sun, 14 Apr 2019 21:23:43 -0400
Subject: [PATCH] feat: improve IntersectTuple

---
 src/types/tuples.ts | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/src/types/tuples.ts b/src/types/tuples.ts
index 7783a66..f25e80d 100644
--- a/src/types/tuples.ts
+++ b/src/types/tuples.ts
@@ -1,3 +1,5 @@
+import {UnionToIntersection} from './utils';
+
 export interface Vector<T> { readonly [x: number]: T; readonly length: number; }
 export type Length<T extends Vector<any>> = T['length'];
 
@@ -12,15 +14,4 @@ export type UnionizeTuple<T extends Vector<any>> = T[number];
  * @param T a tuple of items up to 10
  * @returns an intersection of all items in the tuple
  */
-export type IntersectTuple<T extends Vector<any>> =
-    Length<T> extends 1 ? T[0] :
-    Length<T> extends 2 ? T[0] & T[1] :
-    Length<T> extends 3 ? T[0] & T[1] & T[2] :
-    Length<T> extends 4 ? T[0] & T[1] & T[2] & T[3] :
-    Length<T> extends 5 ? T[0] & T[1] & T[2] & T[3] & T[4] :
-    Length<T> extends 6 ? T[0] & T[1] & T[2] & T[3] & T[4] & T[5] :
-    Length<T> extends 7 ? T[0] & T[1] & T[2] & T[3] & T[4] & T[5] & T[6] :
-    Length<T> extends 8 ? T[0] & T[1] & T[2] & T[3] & T[4] & T[5] & T[6] & T[7] :
-    Length<T> extends 9 ? T[0] & T[1] & T[2] & T[3] & T[4] & T[5] & T[6] & T[7] & T[8] :
-    Length<T> extends 10 ? T[0] & T[1] & T[2] & T[3] & T[4] & T[5] & T[6] & T[7] & T[8] & T[9] :
-        any;
+export type IntersectTuple<T extends Vector<any>>= UnionToIntersection<T[number]>;