fix: correct the error message about the path not being a string in the router pass-through function

src/index.js

@@ -70,7 +70,7 @@ function svrouter() {
     if (typeof realCallback !== "function") {
       throw new Error("The passed callback must be a function.");
     } else if (callback && typeof path !== "string") {
-      throw new Error("The path must be a function");
+      throw new Error("The path must be a string.");
     }
     const realPath = callback ? path.replace(/\/+$/, "") : "";
 

tests/index.test.js

@@ -216,7 +216,7 @@ describe("SVRouter", () => {
   test("should throw an error if path is not a string in passRoute", () => {
     expect(() => {
       router.pass(123, () => {});
-    }).toThrow("The path must be a function");
+    }).toThrow("The path must be a string.");
   });
 
   test("should handle errors thrown in route callbacks gracefully", () => {