Merge pull request #54 from wobsoriano/with-client

Bringing back tRPC Client

client.d.ts

@@ -0,0 +1 @@
+export * from './dist/client/index'

docs/content/1.get-started/1.installation.md

@@ -21,6 +21,14 @@ yarn add @trpc/server @trpc/client trpc-nuxt zod
 
 ::
 
+```ts [nuxt.config.ts]
+export default defineNuxtConfig({
+  build: {
+    transpile: ['trpc-nuxt/client']
+  }
+})
+```
+
 #### Why @trpc/server?
 
 For implementing tRPC endpoints and routers.

docs/content/1.get-started/2.usage/1.simple.md

@@ -0,0 +1,118 @@
+---
+title: Simple
+description: tRPC-Nuxt provides first class integration with tRPC.
+---
+
+# Simple Usage
+
+## 1. Create a tRPC router
+
+Initialize your tRPC backend using the `initTRPC` function and create your first router.
+
+::code-group
+
+```ts [server/trpc/trpc.ts]
+/**
+ * This is your entry point to setup the root configuration for tRPC on the server.
+ * - `initTRPC` should only be used once per app.
+ * - We export only the functionality that we use so we can enforce which base procedures should be used
+ *
+ * Learn how to create protected base procedures and other things below:
+ * @see https://trpc.io/docs/v10/router
+ * @see https://trpc.io/docs/v10/procedures
+ */
+import { initTRPC } from '@trpc/server'
+
+const t = initTRPC.create()
+
+/**
+ * Unprotected procedure
+ **/
+export const publicProcedure = t.procedure;
+
+export const router = t.router;
+export const middleware = t.middleware;
+```
+
+```ts [server/api/trpc/[trpc].ts]
+/**
+ * This is the API-handler of your app that contains all your API routes.
+ * On a bigger app, you will probably want to split this file up into multiple files.
+ */
+import { createNuxtApiHandler } from 'trpc-nuxt'
+import { publicProcedure, router } from '~/server/trpc/trpc'
+import { z } from 'zod'
+
+export const appRouter = router({
+  hello: publicProcedure
+    // This is the input schema of your procedure
+    .input(
+      z.object({
+        text: z.string().nullish(),
+      }),
+    )
+    .query(({ input }) => {
+      // This is what you're returning to your client
+      return {
+        greeting: `hello ${input?.text ?? 'world'}`,
+      }
+    }),
+})
+
+// export only the type definition of the API
+// None of the actual implementation is exposed to the client
+export type AppRouter = typeof appRouter;
+
+// export API handler
+export default createNuxtApiHandler({
+  router: appRouter,
+  createContext: () => ({}),
+})
+```
+
+::
+
+## 2. Create tRPC client plugin
+
+Create a strongly-typed plugin using your API's type signature.
+
+```ts [plugins/client.ts]
+import { createTRPCNuxtClient, httpBatchLink } from 'trpc-nuxt/client'
+import type { AppRouter } from '~/server/trpc/routers'
+
+export default defineNuxtPlugin(() => {
+  /**
+   * createTRPCNuxtClient adds a `useQuery` composable
+   * built on top of `useAsyncData`.
+   */
+  const client = createTRPCNuxtClient<AppRouter>({
+    links: [
+      httpBatchLink({
+        url: '/api/trpc',
+      }),
+    ],
+  })
+
+  return {
+    provide: {
+      client,
+    },
+  }
+})
+```
+
+## 3. Make an API request
+
+```vue [pages/index.vue]
+<script setup lang="ts">
+const { $client } = useNuxtApp()
+
+const hello = await $client.hello.useQuery({ text: 'client' })
+</script>
+
+<template>
+  <div>
+    <p>{{ hello.data?.greeting }}</p>
+  </div>
+</template>
+```

docs/content/1.get-started/2.usage/2.recommended.md

@@ -1,13 +1,11 @@
 ---
-title: Usage
+title: Recommended
 description: tRPC-Nuxt provides first class integration with tRPC.
 ---
 
-# Usage
+# Recommended Usage
 
-## Recommended file structure
-
-Recommended but not enforced file structure. This is what you get when starting from [the examples](../main/example-apps.md).
+Recommended but not enforced file structure.
 
 ```graphql
 .
@@ -24,7 +22,7 @@ Recommended but not enforced file structure. This is what you get when starting
 │   │   ├── context.ts   # <-- create app context
 │   │   └── trpc.ts      # <-- procedure helpers
 ├── plugins
-│   ├── client.ts  # <-- tRPC Client as a plugin
+│   ├── client.ts  # <-- tRPC client plugin
 └── [..]
 ```
 
@@ -35,17 +33,26 @@ Initialize your tRPC backend using the `initTRPC` function and create your first
 ::code-group
 
 ```ts [server/trpc/trpc.ts]
+/**
+ * This is your entry point to setup the root configuration for tRPC on the server.
+ * - `initTRPC` should only be used once per app.
+ * - We export only the functionality that we use so we can enforce which base procedures should be used
+ *
+ * Learn how to create protected base procedures and other things below:
+ * @see https://trpc.io/docs/v10/router
+ * @see https://trpc.io/docs/v10/procedures
+ */
 import { initTRPC } from '@trpc/server'
-import { Context } from '@/server/trpc/context'
+import { Context } from '~/server/trpc/context'
 
-// Avoid exporting the entire t-object since it's not very
-// descriptive and can be confusing to newcomers used to t
-// meaning translation in i18n libraries.
 const t = initTRPC.context<Context>().create()
 
-// Base router and procedure helpers
-export const router = t.router
-export const publicProcedure = t.procedure
+/**
+ * Unprotected procedure
+ **/
+export const publicProcedure = t.procedure;
+export const router = t.router;
+export const middleware = t.middleware;
 ```
 
 ```ts [server/trpc/routers/index.ts]
@@ -72,8 +79,8 @@ export type AppRouter = typeof appRouter
 
 ```ts [server/api/trpc/[trpc].ts]
 import { createNuxtApiHandler } from 'trpc-nuxt'
-import { appRouter } from '@/server/trpc/routers'
-import { createContext } from '@/server/trpc/context'
+import { appRouter } from '~/server/trpc/routers'
+import { createContext } from '~/server/trpc/context'
 
 // export API handler
 export default createNuxtApiHandler({
@@ -105,39 +112,18 @@ If you need to split your router into several subrouters, you can implement them
 Create a strongly-typed plugin using your API's type signature.
 
 ```ts [plugins/client.ts]
-import { httpBatchLink, createTRPCProxyClient } from '@trpc/client'
-import type { AppRouter } from '@/server/trpc/routers'
-import { FetchError } from 'ofetch'
+import { createTRPCNuxtClient, httpBatchLink } from 'trpc-nuxt/client'
+import type { AppRouter } from '~/server/trpc/routers'
 
 export default defineNuxtPlugin(() => {
-  const client = createTRPCProxyClient<AppRouter>({
+  /**
+   * createTRPCNuxtClient adds a `useQuery` composable
+   * built on top of `useAsyncData`.
+   */
+  const client = createTRPCNuxtClient<AppRouter>({
     links: [
       httpBatchLink({
         url: '/api/trpc',
-        
-        
-        /**
-         * Replace regular `fetch` with a `$fetch` from nuxt
-         *
-         * During server-side rendering, calling $fetch to fetch your internal API routes
-         * will directly call the relevant function (emulating the request),
-         * saving an additional API call.
-         *
-         * @see https://nuxt.com/docs/api/utils/dollarfetch
-         */
-        fetch: (input, options) =>
-          globalThis.$fetch.raw(input.toString(), options)
-            .catch((e) => {
-              if (e instanceof FetchError && e.response)
-                return e.response
-
-              throw e
-            })
-            .then(response => ({
-              ...response,
-              json: () => Promise.resolve(response._data),
-            })),
-            
       }),
     ],
   })
@@ -150,16 +136,18 @@ export default defineNuxtPlugin(() => {
 })
 ```
 
-## 3. Make API requests
+## 3. Make an API request
 
 ```vue [pages/index.vue]
 <script setup lang="ts">
 const { $client } = useNuxtApp()
 
-const data = await $client.hello.query({ text: 'client' })
+const hello = await $client.hello.useQuery({ text: 'client' })
 </script>
 
 <template>
-  <p>{{data?.greeting }}</p>
+  <div>
+    <p>{{ hello.data?.greeting }}</p>
+  </div>
 </template>
 ```

docs/content/1.get-started/3.client.md

@@ -0,0 +1,53 @@
+---
+title: Client
+description: tRPC-Nuxt provides first class integration with tRPC.
+---
+
+# Nuxt client
+
+The magic of tRPC is making strongly typed API calls without relying on code generation. With full-stack TypeScript projects, you can directly import types from the server into the client! This is a vital part of how tRPC works.
+
+## Initialize a tRPC client
+
+Create a typesafe client via a Nuxt [plugin](https://nuxt.com/docs/guide/directory-structure/plugins) with the `createTRPCNuxtClient` method from `trpc-nuxt/client`, and add a `links` array with a [terminating link](https://trpc.io/docs/links#the-terminating-link). If you want to learn more about tRPC links, check out the docs [here](https://trpc.io/docs/links):
+
+::alert{type="info"}
+`createTRPCNuxtClient` extends [createTRPCProxyClient](https://trpc.io/docs/vanilla#initialize-a-trpc-client) and adds a `useQuery` method built on top of [useAsyncData](https://nuxt.com/docs/api/composables/use-async-data).
+::
+
+```ts [plugins/client.ts]
+import { createTRPCNuxtClient, httpBatchLink } from 'trpc-nuxt/client'
+import type { AppRouter } from '~/server/trpc/routers'
+
+export default defineNuxtPlugin(() => {
+  const client = createTRPCNuxtClient<AppRouter>({
+    links: [
+      httpBatchLink({
+        url: '/api/trpc',
+      }),
+    ],
+  })
+
+  return {
+    provide: {
+      client,
+    },
+  }
+})
+```
+
+As you can see, we passed `AppRouter` as a type argument of `createTRPCNuxtClient`. This returns a strongly typed `client` instance, a proxy that mirrors the structure of your `AppRouter` on the client:
+
+```vue [pages/index.vue]
+<script setup lang="ts">
+const { $client } = useNuxtApp()
+
+const getUser = await $client.getUser.useQuery('id_bilbo');
+// => { data: { id: 'id_bilbo', name: 'Bilbo' }, pending: false, error: false };
+
+const bilbo = await $client.getUser.query('id_bilbo');
+// => { id: 'id_bilbo', name: 'Bilbo' };
+const frodo = await $client.createUser.mutate({ name: 'Frodo' });
+// => { id: 'id_frodo', name: 'Frodo' };
+</script>
+```

docs/content/1.get-started/4.links/1.httpLink.md

@@ -0,0 +1,58 @@
+---
+title: HTTP Link
+description: httpLink is a terminating link that sends a tRPC operation to a tRPC procedure over HTTP.
+---
+
+# HTTP Link
+
+`httpLink` is a [terminating link](https://trpc.io/docs/links#the-terminating-link) that sends a tRPC operation to a tRPC procedure over HTTP.
+
+`httpLink` supports both POST and GET requests.
+
+::alert{type="info"}
+`httpLink` imported from `trpc-nuxt/client` is a convenience wrapper around the original `httpLink` that replaces regular `fetch` with a [`$fetch`](https://nuxt.com/docs/api/utils/dollarfetch) from Nuxt. It also sets the default headers using [`useRequestHeaders`](https://nuxt.com/docs/api/composables/use-request-headers#userequestheaders).
+::
+
+## Usage
+
+You can import and add the `httpLink` to the `links` array as such:
+
+```ts
+import { createTRPCNuxtClient, httpLink } from 'trpc-nuxt/client'
+import type { AppRouter } from '~/server/trpc/routers'
+
+const client = createTRPCNuxtClient<AppRouter>({
+  links: [
+    httpLink({
+      url: '/api/trpc',
+    }),
+  ],
+})
+```
+
+## `httpLink` Options
+
+The `httpLink` function takes an options object that has the `HTTPLinkOptions` shape.
+
+```ts
+export interface HTTPLinkOptions {
+  url: string;
+  /**
+   * Select headers to pass to `useRequestHeaders`.
+   */
+  pickHeaders?: string[];
+  /**
+   * Add ponyfill for fetch.
+   */
+  fetch?: typeof fetch;
+  /**
+   * Add ponyfill for AbortController
+   */
+  AbortController?: typeof AbortController | null;
+  /**
+   * Headers to be set on outgoing requests or a callback that of said headers
+   * @link http://trpc.io/docs/v10/header
+   */
+  headers?: HTTPHeaders | (() => HTTPHeaders | Promise<HTTPHeaders>);
+}
+```

docs/content/1.get-started/4.links/2.httpBatchLink.md

@@ -0,0 +1,88 @@
+---
+title: HTTP Batch Link
+description: httpBatchLink is a terminating link that batches an array of individual tRPC operations into a single HTTP request that's sent to a single tRPC procedure.
+---
+
+# HTTP Batch Link
+
+`httpBatchLink` is a [terminating link](https://trpc.io/docs/links#the-terminating-link) that batches an array of individual tRPC operations into a single HTTP request that's sent to a single tRPC procedure.
+
+::alert{type="info"}
+`httpBatchLink` imported from `trpc-nuxt/client` is a convenience wrapper around the original `httpBatchLink` that replaces regular `fetch` with a [`$fetch`](https://nuxt.com/docs/api/utils/dollarfetch) from Nuxt. It also sets the default headers using [`useRequestHeaders`](https://nuxt.com/docs/api/composables/use-request-headers#userequestheaders).
+::
+
+## Usage
+
+You can import and add the `httpBatchLink` to the `links` array as such:
+
+```ts
+import { createTRPCNuxtClient, httpBatchLink } from 'trpc-nuxt/client'
+import type { AppRouter } from '~/server/trpc/routers'
+
+const client = createTRPCNuxtClient<AppRouter>({
+  links: [
+    httpBatchLink({
+      url: '/api/trpc',
+    }),
+  ],
+})
+```
+
+After that, you can make use of batching by setting all your procedures in a `Promise.all`. The code below will produce exactly one HTTP request and on the server exactly `one` database query:
+
+```ts
+const somePosts = await Promise.all([
+  $client.post.byId.query(1);
+  $client.post.byId.query(2);
+  $client.post.byId.query(3);
+])
+```
+
+## `httpBatchLink` Options
+
+The `httpBatchLink` function takes an options object that has the `HTTPBatchLinkOptions` shape.
+
+```ts
+export interface HttpBatchLinkOptions extends HTTPLinkOptions {
+  maxURLLength?: number;
+}
+
+export interface HTTPLinkOptions {
+  url: string;
+  /**
+   * Select headers to pass to `useRequestHeaders`.
+   */
+  pickHeaders?: string[];
+  /**
+   * Add ponyfill for fetch.
+   */
+  fetch?: typeof fetch;
+  /**
+   * Add ponyfill for AbortController
+   */
+  AbortController?: typeof AbortController | null;
+  /**
+   * Headers to be set on outgoing requests or a callback that of said headers
+   * @link http://trpc.io/docs/v10/header
+   */
+  headers?: HTTPHeaders | (() => HTTPHeaders | Promise<HTTPHeaders>);
+}
+```
+
+## Setting a maximum URL length
+
+When sending batch requests, sometimes the URL can become too large causing HTTP errors like [413 Payload Too Large](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/413), [414 URI Too Long](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/414), and [404 Not Found](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/404). The `maxURLLength` option will limit the number of requests that can be sent together in a batch.
+
+```ts
+import { createTRPCNuxtClient, httpBatchLink } from 'trpc-nuxt/client';
+import type { AppRouter } from '~/server/trpc/routers'
+
+const client = createTRPCNuxtClient<AppRouter>({
+  links: [
+    httpBatchLink({
+      url: '/api/trpc',
+      maxURLLength: 2083, // a suitable size
+    }),
+  ],
+});
+```

docs/content/1.get-started/5.tips/1.composables.md

@@ -6,6 +6,10 @@ title: Composables
 
 It is often useful to wrap functionality of your `@trpc/client` api within other functions. For this purpose, it's necessary to be able to infer input types and output types generated by your `@trpc/server` router.
 
+::alert{type="info"}
+[createTRPCNuxtClient](/get-started/client/create) adds a `useQuery` method built on top of [useAsyncData](https://nuxt.com/docs/api/composables/use-async-data/).
+::
+
 ## Inference Helpers
 
 `@trpc/server` exports the following helper types to assist with inferring these types from the `AppRouter` exported by your `@trpc/server` router:

docs/content/1.get-started/5.tips/2.headers.md

@@ -6,6 +6,10 @@ title: Headers
 
 We can use the built-in [useRequestHeaders](https://v3.nuxtjs.org/api/composables/use-request-headers/) to set outgoing request headers:
 
+::alert{type="info"}
+[createTRPCNuxtClient](/get-started/client/create) has this feature by default.
+::
+
 ```ts [plugins/client.ts]
 export default defineNuxtPlugin(() => {
   const headers = useRequestHeaders()

docs/package.json

@@ -11,7 +11,7 @@
     "nuxt": "^3.0.0"
   },
   "devDependencies": {
-    "@nuxt-themes/docus": "^0.3.1",
-    "@nuxtlabs/github-module": "^1.5.3"
+    "@nuxt-themes/docus": "^1.1.10",
+    "@nuxtlabs/github-module": "^1.5.4"
   }
 }

package.json

@@ -2,6 +2,7 @@
   "name": "trpc-nuxt",
   "description": "End-to-end typesafe APIs in Nuxt applications.",
   "type": "module",
+  "packageManager": "pnpm@7.18.2",
   "version": "0.4.3",
   "license": "MIT",
   "sideEffects": false,
@@ -9,13 +10,19 @@
     ".": {
       "require": "./dist/index.cjs",
       "import": "./dist/index.mjs"
+    },
+    "./client": {
+      "types": "./dist/client/index.d.ts",
+      "require": "./dist/client/index.cjs",
+      "import": "./dist/client/index.mjs"
     }
   },
   "main": "./dist/index.mjs",
   "module": "./dist/index.mjs",
   "types": "./dist/index.d.ts",
   "files": [
-    "dist"
+    "dist",
+    "client.d.ts"
   ],
   "scripts": {
     "dev": "concurrently \"pnpm build -- --watch\" \"pnpm --filter playground dev\"",
@@ -31,15 +38,15 @@
     "@trpc/server": "^10.0.0"
   },
   "dependencies": {
-    "h3": "^1.0.1",
-    "nanoid": "^4.0.0",
+    "h3": "^1.0.2",
+    "ofetch": "^1.0.0",
     "ohash": "^1.0.0",
     "ufo": "^1.0.0"
   },
   "devDependencies": {
-    "@nuxtjs/eslint-config-typescript": "^11.0.0",
-    "@trpc/client": "^10.1.0",
-    "@trpc/server": "^10.1.0",
+    "@nuxt/eslint-config": "^0.1.1",
+    "@trpc/client": "^10.5.0",
+    "@trpc/server": "^10.5.0",
     "bumpp": "^8.2.1",
     "concurrently": "^7.5.0",
     "eslint": "^8.25.0",
@@ -48,7 +55,7 @@
   },
   "eslintConfig": {
     "extends": [
-      "@nuxtjs/eslint-config-typescript"
+      "@nuxt/eslint-config"
     ],
     "rules": {
       "@typescript-eslint/no-unused-vars": [
@@ -64,5 +71,13 @@
     "*.md",
     "dist",
     ".output"
-  ]
+  ],
+  "pnpm": {
+    "overrides": {
+      "nuxt": "3.0.0"
+    }
+  },
+  "engines": {
+    "node": "^16.13.0 || ^18.12.0"
+  }
 }

playground/nuxt.config.ts

@@ -1,3 +1,6 @@
 // https://v3.nuxtjs.org/api/configuration/nuxt.config
 export default defineNuxtConfig({
+  build: {
+    transpile: ['trpc-nuxt/client']
+  }
 })

playground/package.json

@@ -9,8 +9,8 @@
     "postinstall": "nuxt prepare"
   },
   "dependencies": {
-    "@trpc/client": "^10.1.0",
-    "@trpc/server": "^10.1.0",
+    "@trpc/client": "^10.5.0",
+    "@trpc/server": "^10.5.0",
     "superjson": "^1.11.0",
     "trpc-nuxt": "workspace:*",
     "zod": "^3.19.1"

playground/pages/index.vue

@@ -1,8 +1,4 @@
 <script setup lang="ts">
-import { TRPCClientError } from '@trpc/client';
-import type { inferRouterOutputs } from '@trpc/server';
-import type { AppRouter } from '~~/server/trpc/routers';
-
 const { $client } = useNuxtApp()
 
 const addTodo = async () => {
@@ -21,10 +17,7 @@ const addTodo = async () => {
   }
 }
 
-type RouterOutput = inferRouterOutputs<AppRouter>;
-type ErrorOutput = TRPCClientError<AppRouter>
-
-const { data: todos, pending, error, refresh } = await useAsyncData<RouterOutput['todo']['getTodos'], ErrorOutput>(() => $client.todo.getTodos.query())
+const { data: todos, pending, error, refresh } = await $client.todo.getTodos.useQuery()
 </script>
 
 <template>
@@ -37,8 +30,14 @@ const { data: todos, pending, error, refresh } = await useAsyncData<RouterOutput
     </div>
     <div v-else>
       <ul>
-        <li v-for="t in todos?.slice(0, 10)" :key="t.id">
-          <NuxtLink :class="{ completed: t.completed }" :to="`/todo/${t.id}`">
+        <li
+          v-for="t in todos?.slice(0, 10)"
+          :key="t.id"
+        >
+          <NuxtLink
+            :class="{ completed: t.completed }"
+            :to="`/todo/${t.id}`"
+          >
             Title: {{ t.title }}
           </NuxtLink>
         </li>

playground/plugins/trpc-client.ts

@@ -1,10 +1,10 @@
-import { createTRPCProxyClient, httpBatchLink, loggerLink } from '@trpc/client'
+import { loggerLink } from '@trpc/client'
 import superjson from 'superjson'
+import { createTRPCNuxtClient, httpBatchLink } from 'trpc-nuxt/client'
 import type { AppRouter } from '~~/server/trpc/routers'
 
 export default defineNuxtPlugin(() => {
-  const headers = useRequestHeaders()
-  const client = createTRPCProxyClient<AppRouter>({
+  const client = createTRPCNuxtClient<AppRouter>({
     transformer: superjson,
     links: [
       // adds pretty logs to your console in development and logs errors in production
@@ -13,12 +13,7 @@ export default defineNuxtPlugin(() => {
           process.env.NODE_ENV === 'development' ||
           (opts.direction === 'down' && opts.result instanceof Error)
       }),
-      httpBatchLink({
-        url: 'http://localhost:3000/api/trpc',
-        headers () {
-          return headers
-        }
-      })
+      httpBatchLink()
     ]
   })
 

src/client/index.ts

@@ -0,0 +1,71 @@
+import { type CreateTRPCClientOptions, type inferRouterProxyClient, createTRPCProxyClient } from '@trpc/client'
+import { type AnyRouter } from '@trpc/server'
+import { createFlatProxy, createRecursiveProxy } from '@trpc/server/shared'
+import { hash } from 'ohash'
+import { type DecoratedProcedureRecord } from './types'
+// @ts-expect-error: Nuxt auto-imports
+import { getCurrentInstance, onScopeDispose, useAsyncData } from '#imports'
+
+/**
+ * Calculates the key used for `useAsyncData` call
+ */
+export function getQueryKey (
+  path: string,
+  input: unknown
+): string {
+  return input === undefined ? path : `${path}-${hash(input || '')}`
+}
+
+export function createNuxtProxyDecoration<TRouter extends AnyRouter> (name: string, client: inferRouterProxyClient<TRouter>) {
+  return createRecursiveProxy((opts) => {
+    const args = opts.args
+
+    const pathCopy = [name, ...opts.path]
+
+    // The last arg is for instance `.useMutation` or `.useQuery()`
+    const lastArg = pathCopy.pop()!
+
+    // The `path` ends up being something like `post.byId`
+    const path = pathCopy.join('.')
+
+    const [input, otherOptions] = args
+
+    if (lastArg === 'useQuery') {
+      const { trpc, ...asyncDataOptions } = otherOptions || {} as any
+
+      let controller: AbortController
+
+      if (trpc?.abortOnUnmount) {
+        if (getCurrentInstance()) {
+          onScopeDispose(() => {
+            controller?.abort?.()
+          })
+        }
+        controller = typeof AbortController !== 'undefined' ? new AbortController() : {} as AbortController
+      }
+
+      const queryKey = getQueryKey(path, input)
+      return useAsyncData(queryKey, () => (client as any)[path].query(input, {
+        signal: controller?.signal,
+        ...trpc
+      }), asyncDataOptions)
+    }
+
+    return (client as any)[path][lastArg](input)
+  })
+}
+
+export function createTRPCNuxtClient<TRouter extends AnyRouter> (opts: CreateTRPCClientOptions<TRouter>) {
+  const client = createTRPCProxyClient<TRouter>(opts)
+
+  const decoratedClient = createFlatProxy((key) => {
+    return createNuxtProxyDecoration(key, client)
+  }) as DecoratedProcedureRecord<TRouter['_def']['record'], TRouter>
+
+  return decoratedClient
+}
+
+export {
+  httpBatchLink,
+  httpLink
+} from './links'

src/client/links.ts

@@ -0,0 +1,78 @@
+import { httpLink as _httpLink, httpBatchLink as _httpBatchLink } from '@trpc/client'
+import { type AnyRouter } from '@trpc/server'
+import { FetchError } from 'ofetch'
+// @ts-expect-error: Nuxt auto-imports
+import { useRequestHeaders } from '#imports'
+import { type HTTPLinkOptions as _HTTPLinkOptions } from '@trpc/client/dist/links/internals/httpUtils'
+
+function customFetch(input: RequestInfo | URL, init?: RequestInit) {
+  return globalThis.$fetch.raw(input.toString(), init)
+    .catch((e) => {
+      if (e instanceof FetchError && e.response) { return e.response }
+      throw e
+    })
+    .then(response => ({
+      ...response,
+      json: () => Promise.resolve(response._data)
+    }))
+}
+
+export interface HTTPLinkOptions extends _HTTPLinkOptions {
+  /**
+   * Select headers to pass to `useRequestHeaders`.
+   */
+  pickHeaders?: string[] 
+}
+
+/**
+ * This is a convenience wrapper around the original httpLink
+ * that replaces regular `fetch` with a `$fetch` from Nuxt. It
+ * also sets the default headers based on `useRequestHeaders` values.
+ *
+ * During server-side rendering, calling $fetch to fetch your internal API routes
+ * will directly call the relevant function (emulating the request),
+ * saving an additional API call.
+ *
+ * @see https://nuxt.com/docs/api/utils/dollarfetch
+ */
+export function httpLink<TRouter extends AnyRouter>(opts?: HTTPLinkOptions) {
+  const headers = useRequestHeaders(opts?.pickHeaders)
+
+  return _httpLink<TRouter>({
+    url: '/api/trpc',
+    headers () {
+      return headers
+    },
+    fetch: customFetch,
+    ...opts,
+  })
+}
+
+export interface HttpBatchLinkOptions extends HTTPLinkOptions {
+  maxURLLength?: number;
+}
+
+
+/**
+ * This is a convenience wrapper around the original httpBatchLink
+ * that replaces regular `fetch` with a `$fetch` from Nuxt. It
+ * also sets the default headers based on `useRequestHeaders` values.
+ *
+ * During server-side rendering, calling $fetch to fetch your internal API routes
+ * will directly call the relevant function (emulating the request),
+ * saving an additional API call.
+ *
+ * @see https://nuxt.com/docs/api/utils/dollarfetch
+ */
+export function httpBatchLink<TRouter extends AnyRouter>(opts?: HttpBatchLinkOptions) {
+  const headers = useRequestHeaders(opts?.pickHeaders)
+
+  return _httpBatchLink<TRouter>({
+    url: '/api/trpc',
+    headers () {
+      return headers
+    },
+    fetch: customFetch,
+    ...opts,
+  })
+}

src/client/types.ts

@@ -0,0 +1,80 @@
+import type { TRPCClientErrorLike, TRPCRequestOptions as _TRPCRequestOptions } from '@trpc/client'
+import { type TRPCSubscriptionObserver } from '@trpc/client/dist/internals/TRPCClient'
+import type {
+  AnyMutationProcedure,
+  AnyProcedure,
+  AnyQueryProcedure,
+  AnyRouter,
+  ProcedureRouterRecord,
+  inferProcedureInput,
+  inferProcedureOutput,
+  ProcedureArgs,
+  AnySubscriptionProcedure
+} from '@trpc/server'
+import { type inferObservableValue, type Unsubscribable } from '@trpc/server/observable'
+import { inferTransformedProcedureOutput } from '@trpc/server/shared'
+import type {
+  AsyncData,
+  AsyncDataOptions,
+  KeyOfRes,
+  PickFrom,
+  _Transform
+} from 'nuxt/dist/app/composables/asyncData'
+
+interface TRPCRequestOptions extends _TRPCRequestOptions {
+  abortOnUnmount?: boolean
+}
+
+type Resolver<TProcedure extends AnyProcedure> = (
+  ...args: ProcedureArgs<TProcedure['_def']>
+) => Promise<inferTransformedProcedureOutput<TProcedure>>;
+
+type SubscriptionResolver<
+  TProcedure extends AnyProcedure,
+  TRouter extends AnyRouter,
+> = (
+  ...args: [
+    input: ProcedureArgs<TProcedure['_def']>[0],
+    opts: ProcedureArgs<TProcedure['_def']>[1] &
+    Partial<
+        TRPCSubscriptionObserver<
+          inferObservableValue<inferProcedureOutput<TProcedure>>,
+          TRPCClientErrorLike<TRouter>
+        >
+      >,
+  ]
+) => Unsubscribable
+
+type DecorateProcedure<
+  TProcedure extends AnyProcedure,
+  TRouter extends AnyRouter,
+> = TProcedure extends AnyQueryProcedure
+  ? {
+      useQuery: <
+      TData = inferTransformedProcedureOutput<TProcedure>,
+      Transform extends _Transform<TData> = _Transform<TData, TData>,
+      PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>,
+     >(
+        input: inferProcedureInput<TProcedure>,
+        opts?: AsyncDataOptions<TData, Transform, PickKeys> & { trpc?: TRPCRequestOptions },
+      ) => AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, TRPCClientErrorLike<TProcedure>>,
+      query: Resolver<TProcedure>
+    } : TProcedure extends AnyMutationProcedure ? {
+      mutate: Resolver<TProcedure>
+    } : TProcedure extends AnySubscriptionProcedure ? {
+      subscribe: SubscriptionResolver<TProcedure, TRouter>
+    } : never
+
+/**
+* @internal
+*/
+export type DecoratedProcedureRecord<
+  TProcedures extends ProcedureRouterRecord,
+  TRouter extends AnyRouter,
+> = {
+  [TKey in keyof TProcedures]: TProcedures[TKey] extends AnyRouter
+    ? DecoratedProcedureRecord<TProcedures[TKey]['_def']['record'], TRouter>
+    : TProcedures[TKey] extends AnyProcedure
+      ? DecorateProcedure<TProcedures[TKey], TRouter>
+      : never;
+}

tsup.config.ts

@@ -1,11 +1,11 @@
 import { defineConfig } from 'tsup'
 
 export default defineConfig({
-  entry: ['src/index.ts'],
+  entry: ['src/index.ts', 'src/client/index.ts'],
   format: ['cjs', 'esm'],
   splitting: false,
   clean: true,
-  external: ['#app', '#imports'],
+  external: ['#app', '#imports', /@trpc\/client/, /@trpc\/server/],
   dts: true,
   outExtension ({ format }) {
     return {