only expose one entry (#22)

Author: shiyuhang0

tsup.config.ts

@@ -2,6 +2,6 @@ import { defineConfig } from "tsup"
 
 export default defineConfig({
   dts: true,
-  entry: ["src/**"],
+  entry: ["src/index.ts"],
   format: ["cjs", "esm"],
 })