Improve type infererence for Map

immutable-js · Jun 27, 2022 · 6b774e3 · 6b774e3
1 parent 7cf6f8e
commit 6b774e3
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/type-definitions/immutable.d.ts b/type-definitions/immutable.d.ts
@@ -759,9 +759,9 @@ declare namespace Immutable {
    * but since Immutable Map keys can be of any type the argument to `get()` is
    * not altered.
    */
-  function Map<K, V>(collection?: Iterable<[K, V]>): Map<K, V>;
-  function Map<V>(obj: { [key: string]: V }): Map<string, V>;
-  function Map<K extends string | symbol, V>(obj: { [P in K]?: V }): Map<K, V>;
+  function Map<V>(obj: V): (V extends Map<unknown, unknown>
+    ? V
+    : Map<keyof V, V[keyof V]>);
 
   interface Map<K, V> extends Collection.Keyed<K, V> {
     /**