not to return the style property when dinamic is not specified

Author: msaktype

src/__tests__/windctrl.test.ts

@@ -8,19 +8,19 @@ describe("windCtrl", () => {
         base: "rounded px-4 py-2",
       });
 
-      const result = button({});
+      const result = button();
       expect(result.className).toContain("rounded");
       expect(result.className).toContain("px-4");
       expect(result.className).toContain("py-2");
-      expect(result.style).toEqual({});
+      expect(result.style).toEqual(undefined);
     });
 
     it("should work without base classes", () => {
       const button = windCtrl({});
 
       const result = button({});
       expect(result.className).toBe("");
-      expect(result.style).toEqual({});
+      expect(result.style).toEqual(undefined);
     });
   });
 
@@ -232,7 +232,7 @@ describe("windCtrl", () => {
 
       const result = button({ w: "full" });
       expect(result.className).toContain("w-full");
-      expect(result.style).toEqual({});
+      expect(result.style).toEqual(undefined);
     });
 
     it("should apply style when dynamic resolver returns object with style", () => {
@@ -295,7 +295,7 @@ describe("windCtrl", () => {
 
       const stringResult = button({ w: "full" });
       expect(stringResult.className).toContain("w-full");
-      expect(stringResult.style).toEqual({});
+      expect(stringResult.style).toEqual(undefined);
 
       const numberResult = button({ w: 300 });
       expect(numberResult.style).toEqual({ width: "300px" });
@@ -439,7 +439,7 @@ describe("windCtrl", () => {
       const button = windCtrl({});
       const result = button({});
       expect(result.className).toBe("");
-      expect(result.style).toEqual({});
+      expect(result.style).toEqual(undefined);
     });
 
     it("should handle undefined props gracefully", () => {

src/index.ts

@@ -45,7 +45,7 @@ type Props<
 
 type Result = {
   className: string;
-  style: CSSProperties;
+  style?: CSSProperties;
 };
 
 function mergeStyles(
@@ -183,9 +183,11 @@ export function windCtrl<
 
     const finalClassName = twMerge(clsx(classNameParts));
 
+    const hasStyle = Object.keys(mergedStyle).length > 0;
+    
     return {
       className: finalClassName,
-      style: mergedStyle,
+      ...(hasStyle && { style: mergedStyle }),
     };
   };
 }