feat(api): added the Prepend type

thi-ng · Jan 5, 2020 · 7bfe7a8 · 7bfe7a8
1 parent fa59ff3
commit 7bfe7a8
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/packages/api/src/tuple.ts b/packages/api/src/tuple.ts
@@ -16,3 +16,10 @@ export type Tail<T extends unknown[]> = ((...a: T) => void) extends (
 ) => void
     ? R
     : never;
+
+/**
+ * Add an element at the start of an tuple.
+ */
+export type Prepend<T, U extends unknown[]> = Parameters<
+    (v: T, ...args: U) => void
+>;