start backend work

projects/common/tsup.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from "tsup";
+
+export default defineConfig({
+  entry: ["src/index.ts"],
+  splitting: false,
+  sourcemap: true,
+  clean: true,
+  dts: true, // Generates type declarations
+  format: ["esm"], // Ensures output is in ESM format
+});