api: Initialize express API with tRPC

apps/api/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "api",
+  "version": "1.0.0",
+  "description": "",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "scripts": {
+    "dev": "tsx watch ./src/index.ts",
+    "build": "tsc",
+    "start": "tsx ./src/index.ts",
+    "lint": "eslint --ext .ts src",
+    "format": "prettier --write src/**/*.ts"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@trpc/server": "^10.45.2",
+    "express": "^4.19.2",
+    "zod": "^3.23.8"
+  },
+  "devDependencies": {
+    "@repo/eslint-config": "workspace:^",
+    "@repo/typescript-config": "workspace:^",
+    "@types/express": "^4.17.21",
+    "@types/node": "^20.11.24",
+    "eslint": "^8.57.0",
+    "tsx": "^4.10.5",
+    "typescript": "^5.3.3"
+  }
+}

apps/api/src/config.ts

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+export const SPOTIFY_SCOPES = [
+  "user-read-currently-playing",
+  "user-read-playback-state",
+  "user-modify-playback-state",
+  "user-read-playback-position",
+  "user-read-recently-played",
+  "user-top-read",
+  "user-library-read",
+  "user-library-modify",
+  "streaming",
+];

apps/api/src/context.ts

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+import type { CreateFastifyContextOptions } from "@trpc/server/adapters/fastify";
+
+export async function createContextInner() {
+  return {};
+}
+
+export async function createContext({ req, res }: CreateFastifyContextOptions) {
+  const server = req.server;
+
+  return {
+    server,
+    req,
+    res,
+  };
+}
+
+export type Context = Awaited<ReturnType<typeof createContext>>;

apps/api/src/index.ts

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+import express from "express";
+import * as trpcExpress from "@trpc/server/adapters/express";
+import { appRouter } from "./router";
+import { createContext } from "./context";
+
+const app = express();
+
+app.get("/", (req, res) => {
+  res.send("Hello World!");
+});
+
+app.use(
+  "/trpc",
+  trpcExpress.createExpressMiddleware({
+    router: appRouter,
+    createContext,
+  })
+);
+
+app.set("trust proxy", true);
+app.listen(4000, () => {
+  console.log(`NowPlaying API listening on port 4000`);
+});

apps/api/src/router.ts

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+import { initTRPC } from "@trpc/server";
+import type { Context } from "./context";
+
+const t = initTRPC.context<Context>().create();
+
+export const appRouter = t.router({
+  hello: t.procedure.query(({ ctx }) => {
+    return ctx.server.info;
+  }),
+});
+export type AppRouter = typeof appRouter;