Add TS trick to use result as string

askirmas · Feb 6, 2021 · 3dd13a8 · 3dd13a8
1 parent bb57f7d
commit 3dd13a8
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Showing 2 changed files with 6 additions and 6 deletions.
diff --git a/src/index.spec.ts b/src/index.spec.ts
@@ -13,8 +13,7 @@ it("TypeScript manipulations", () => {
 
   React_createElement(
     {
-      //@ts-expect-error
-      "className": classNaming({"class1": undefined})
+      "className": classNaming<string>({"class1": undefined})
     }
   )
 

diff --git a/src/index.ts b/src/index.ts
@@ -21,13 +21,14 @@ export {
   classNaming
 }
 
-function classNaming(
+function classNaming<O>(
+  /** Comment */
   classNames: ClassNamesMap<string>
-): ClassName;
-function classNaming(
+): O extends string ? string : ClassName;
+function classNaming<O>(
   className: undefined|string,
   classNames: ClassNamesMap<string>
-): ClassName;
+): O extends string ? string : ClassName;
 function classNaming(...args: any[]) {
   return _classNaming(args.pop(), args.pop())
 }