add vercel deployment for backend

Author: BetrixDev

backend/.env.example

@@ -0,0 +1 @@
+STANDALONE="true"

backend/.gitignore

@@ -41,4 +41,5 @@ yarn-error.log*
 **/*.log
 package-lock.json
 **/*.bun
-*.exe
+*.exe
+.env

backend/src/__tests__/routes/hc.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "bun:test";
-import { app } from "../..";
+import app from "../..";
 
 describe("/hc", () => {
   it("returns Server is healthy", async () => {

backend/src/index.ts

@@ -3,7 +3,7 @@ import { fetchRequestHandler } from "@trpc/server/adapters/fetch";
 import { Elysia } from "elysia";
 import { appRouter } from "./trpc/routers";
 
-export const app = new Elysia()
+const app = new Elysia()
   .use(cors())
   .get("/hc", () => {
     return {
@@ -19,11 +19,16 @@ export const app = new Elysia()
         return {};
       },
     });
-  })
-  .listen(process.env.PORT ?? 1337);
+  });
+
+if (process.env.STANDALONE === "true") {
+  app.listen(process.env.PORT ?? 1337);
 
-if (process.env.NODE_ENV === "test") {
-  console.log(`Backend is running at ${app.server?.hostname}:${app.server?.port}`);
+  if (process.env.NODE_ENV !== "test") {
+    console.log(`Backend is running at ${app.server?.hostname}:${app.server?.port}`);
+  }
 }
 
+export default app;
+
 export type AppRouter = typeof appRouter;

backend/vercel.json

@@ -0,0 +1,9 @@
+{
+    "$schema": "https://openapi.vercel.sh/vercel.json",
+    "rewrites": [
+		{
+			"source": "/(.*)",
+			"destination": "/src"
+		}
+    ]
+}