initial commit

src/server/api/root.ts

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+import { postRouter } from "~/server/api/routers/post";
+import { createCallerFactory, createTRPCRouter } from "~/server/api/trpc";
+
+/**
+ * This is the primary router for your server.
+ *
+ * All routers added in /api/routers should be manually added here.
+ */
+export const appRouter = createTRPCRouter({
+  post: postRouter,
+});
+
+// export type definition of API
+export type AppRouter = typeof appRouter;
+
+/**
+ * Create a server-side caller for the tRPC API.
+ * @example
+ * const trpc = createCaller(createContext);
+ * const res = await trpc.post.all();
+ *       ^? Post[]
+ */
+export const createCaller = createCallerFactory(appRouter);

src/server/api/routers/post.ts

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+import { z } from "zod";
+
+import { createTRPCRouter, publicProcedure } from "~/server/api/trpc";
+
+// Mocked DB
+interface Post {
+  id: number;
+  name: string;
+}
+const posts: Post[] = [
+  {
+    id: 1,
+    name: "Hello World",
+  },
+];
+
+export const postRouter = createTRPCRouter({
+  hello: publicProcedure
+    .input(z.object({ text: z.string() }))
+    .query(({ input }) => {
+      return {
+        greeting: `Hello ${input.text}`,
+      };
+    }),
+
+  create: publicProcedure
+    .input(z.object({ name: z.string().min(1) }))
+    .mutation(async ({ input }) => {
+      const post: Post = {
+        id: posts.length + 1,
+        name: input.name,
+      };
+      posts.push(post);
+      return post;
+    }),
+
+  getLatest: publicProcedure.query(() => {
+    return posts.at(-1) ?? null;
+  }),
+});

src/server/api/trpc.ts

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+/**
+ * YOU PROBABLY DON'T NEED TO EDIT THIS FILE, UNLESS:
+ * 1. You want to modify request context (see Part 1).
+ * 2. You want to create a new middleware or type of procedure (see Part 3).
+ *
+ * TL;DR - This is where all the tRPC server stuff is created and plugged in. The pieces you will
+ * need to use are documented accordingly near the end.
+ */
+import { initTRPC } from "@trpc/server";
+import superjson from "superjson";
+import { ZodError } from "zod";
+
+/**
+ * 1. CONTEXT
+ *
+ * This section defines the "contexts" that are available in the backend API.
+ *
+ * These allow you to access things when processing a request, like the database, the session, etc.
+ *
+ * This helper generates the "internals" for a tRPC context. The API handler and RSC clients each
+ * wrap this and provides the required context.
+ *
+ * @see https://trpc.io/docs/server/context
+ */
+export const createTRPCContext = async (opts: { headers: Headers }) => {
+  return {
+    ...opts,
+  };
+};
+
+/**
+ * 2. INITIALIZATION
+ *
+ * This is where the tRPC API is initialized, connecting the context and transformer. We also parse
+ * ZodErrors so that you get typesafety on the frontend if your procedure fails due to validation
+ * errors on the backend.
+ */
+const t = initTRPC.context<typeof createTRPCContext>().create({
+  transformer: superjson,
+  errorFormatter({ shape, error }) {
+    return {
+      ...shape,
+      data: {
+        ...shape.data,
+        zodError:
+          error.cause instanceof ZodError ? error.cause.flatten() : null,
+      },
+    };
+  },
+});
+
+/**
+ * Create a server-side caller.
+ *
+ * @see https://trpc.io/docs/server/server-side-calls
+ */
+export const createCallerFactory = t.createCallerFactory;
+
+/**
+ * 3. ROUTER & PROCEDURE (THE IMPORTANT BIT)
+ *
+ * These are the pieces you use to build your tRPC API. You should import these a lot in the
+ * "/src/server/api/routers" directory.
+ */
+
+/**
+ * This is how you create new routers and sub-routers in your tRPC API.
+ *
+ * @see https://trpc.io/docs/router
+ */
+export const createTRPCRouter = t.router;
+
+/**
+ * Middleware for timing procedure execution and adding an artificial delay in development.
+ *
+ * You can remove this if you don't like it, but it can help catch unwanted waterfalls by simulating
+ * network latency that would occur in production but not in local development.
+ */
+const timingMiddleware = t.middleware(async ({ next, path }) => {
+  const start = Date.now();
+
+  if (t._config.isDev) {
+    // artificial delay in dev
+    const waitMs = Math.floor(Math.random() * 400) + 100;
+    await new Promise((resolve) => setTimeout(resolve, waitMs));
+  }
+
+  const result = await next();
+
+  const end = Date.now();
+  console.log(`[TRPC] ${path} took ${end - start}ms to execute`);
+
+  return result;
+});
+
+/**
+ * Public (unauthenticated) procedure
+ *
+ * This is the base piece you use to build new queries and mutations on your tRPC API. It does not
+ * guarantee that a user querying is authorized, but you can still access user session data if they
+ * are logged in.
+ */
+export const publicProcedure = t.procedure.use(timingMiddleware);