fix: incorrect resulting type when merging 3+ readonly tuples (#20)

RebeccaStevens · Nov 22, 2021 · 696a1b2 · 696a1b2
1 parent daa1d4e
commit 696a1b2
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diff --git a/src/types/defaults.ts b/src/types/defaults.ts
@@ -133,7 +133,7 @@ type DeepMergeArraysDefaultHKTHelper<
   ? Head extends ReadonlyArray<unknown>
     ? Rest extends readonly [
         ReadonlyArray<unknown>,
-        ...ReadonlyArray<unknown[]>
+        ...ReadonlyArray<ReadonlyArray<unknown>>
       ]
       ? DeepMergeArraysDefaultHKTHelper<Rest, MF, [...Acc, ...Head]>
       : [...Acc, ...Head]

diff --git a/tests/types/test.ts b/tests/types/test.ts
@@ -77,6 +77,9 @@ const f = {
 // $ExpectType { foo: [1, 2, 3, "a", "b", "c"]; }
 deepmerge(e, f);
 
+// $ExpectType { foo: [1, 2, 3, "a", "b", "c", "a", "b", "c"]; }
+deepmerge(e, f, f);
+
 // $ExpectType { foo: (string | number)[]; }
 deepmerge(e as E, f as F);