fix: add cjs format support

tsup.config.ts

@@ -0,0 +1,23 @@
+import { defineConfig, Options } from "tsup";
+
+const commonConfig: Options = {
+  clean: true,
+  dts: true,
+  splitting: false,
+  tsconfig: "tsconfig.prod.json",
+};
+
+export default defineConfig([
+  {
+    ...commonConfig,
+    entry: ["src/**/*"],
+    outDir: "dist/cjs",
+    format: ["cjs"],
+  },
+  {
+    ...commonConfig,
+    entry: ["src/**/*"],
+    outDir: "dist/esm",
+    format: ["esm"],
+  },
+]);