tRPC

1. tRPC for fastify

1. install

   pnpm add @trpc/server zod
   pnpm add -D @trpc/server/adapters/fastify
   

2. create src/trpc.ts

   import { initTRPC } from '@trpc/server';
   import { z } from 'zod';
   
   const t = initTRPC.create();
   
   export const appRouter = t.router({
     hello: t.procedure
       .input(z.object({ name: z.string() }))
       .query(({ input }) => {
         return { greeting: `Hello, ${input.name}!` };
       }),
   });
   
   export type AppRouter = typeof appRouter;
   

3. in src/index.ts

   import { fastifyTRPCPlugin } from '@trpc/server/adapters/fastify';
   import { appRouter } from './trpc';
   
   await fastify.register(fastifyTRPCPlugin, {
     prefix: '/trpc',
     trpcOptions: { router: appRouter, createContext: () => ({}) },
   });
   

2. tRPC for package

1. package/trpc/router.ts

   import { initTRPC } from '@trpc/server';
   import { z } from 'zod';
   
   const t = initTRPC.create();
   
   export const appRouter = t.router({
     hello: t.procedure
       .input(z.object({ name: z.string() }))
       .query(({ input }) => {
         return { greeting: `Hello, ${input.name}!` };
       }),
   });
   
   // Export type definition
   export type AppRouter = typeof appRouter;
   

2. export approuter in index.ts

   export * from './router';
   

3. Usage in Fastify App (apps/api/src/index.ts)

   import Fastify from 'fastify';
   import { fastifyTRPCPlugin } from '@trpc/server/adapters/fastify';
   import { appRouter } from 'package/trpc';
   
   const fastify = Fastify({ logger: true });
   
   await fastify.register(fastifyTRPCPlugin, {
     prefix: '/trpc',
     trpcOptions: {
       router: appRouter,
       createContext: () => ({}),
     },
   });
   
   fastify.listen({ port: 3000 });
   

4. aliase path

   // tsconfig.json
   {
     "compilerOptions": {
       "baseUrl": ".",
       "paths": {
         "package/trpc": ["package/trpc/index.ts"]
       }
     }
   }
   

5. Use in each sub-project (apps/api/tsconfig.json)

   {
     "extends": "../../tsconfig.json",
     "compilerOptions": {
       "outDir": "dist",
       "rootDir": "src"
     },
     "include": ["src"]
   }