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ramda · Jun 29, 2023 · 5a099d1 · 5a099d1
1 parent 0f65159
commit 5a099d1
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/types/concat.d.ts b/types/concat.d.ts
@@ -11,4 +11,5 @@ export function concat<T2>(__: Placeholder, list2: readonly T2[]): <T1>(list1: (
 // concat(string, string)
 export function concat<S1 extends string, S2 extends string>(s1: S1, s2: S2): string extends (S1 | S2) ? string : `${S1}${S2}`;
 // concat(list, list)
+// if you don't do 2 types here the single T will collapse list1 and list2 when you have tuples of the same type, which is incorrect behavior
 export function concat<T1, T2 extends T1>(list1: readonly T1[], list2: readonly T2[]): T1[];