release v0.1.20

README.md

@@ -4,6 +4,17 @@
 
 End-to-end typesafe APIs with [tRPC.io](https://trpc.io/) in Nuxt applications.
 
+<p align="center">
+  <figure>
+    <img src="https://i.imgur.com/AjmNUxj.gif" alt="Demo" />
+    <figcaption>
+      <p align="center">
+        The client above is <strong>not</strong> importing any code from the server, only its type declarations.
+      </p>
+    </figcaption>
+  </figure>
+</p>
+
 ## Install
 
 ```bash
@@ -63,11 +74,9 @@ const client = useClient() // auto-imported
 
 const users = await client.query('getUsers')
 
-const addUser = async () => {
-  const newUser = await client.mutation('createUser', {
-    name: 'wagmi'
-  })
-}
+const newUser = await client.mutation('createUser', {
+  name: 'wagmi'
+})
 ```
 
 ## useAsyncQuery
@@ -86,13 +95,28 @@ const {
   refresh
 } = await useAsyncQuery(['getUser', { id: 69 }], {
   // pass useAsyncData options here
-  server: true
+  lazy: false
 })
 ```
 
+## useClientHeaders
+
+A composable that lets you add additional properties to pass to the tRPC Client. It uses `useStorage` from [@vueuse/core](https://vueuse.org/core/usestorage).
+
+```ts
+const headers = useClientHeaders()
+
+const { data: token } = await useAsyncQuery(['auth.login', { username, password }])
+
+headers.value.Authorization = `Bearer ${token}`
+
+// All client calls will now include the Authorization header.
+// For SSR, please follow this until I found a solution https://github.com/trpc/trpc/discussions/1686
+```
+
 ## Options
 
-trpc-nuxt accepts the following options exposed under `~/server/trpc.index.ts`:
+trpc-nuxt accepts the following options exposed under `~/server/trpc/index.ts`:
 
 ```ts
 import * as trpc from '@trpc/server'
@@ -131,11 +155,17 @@ export const onError = (payload: OnErrorPayload<typeof router>) => {
 
 - [Validation](/recipes/validation.md)
 - [Authorization](/recipes/authorization.md)
+- [Merging Routers](/recipes/merging-routers.md)
 - [Error Handling](/recipes/error-handling.md)
 - [Error Formatting](/recipes/error-formatting.md)
+- [Inference Helpers](/recipes/inference-helpers.md)
 
 Learn more about tRPC.io [here](https://trpc.io/docs).
 
+## Recommended IDE Setup
+
+- [VS Code](https://code.visualstudio.com/) + [Volar](https://marketplace.visualstudio.com/items?itemName=Vue.volar)
+
 ## License
 
 MIT

package.json

@@ -1,10 +1,11 @@
 {
   "name": "trpc-nuxt",
   "type": "module",
-  "version": "0.1.1",
-  "packageManager": "pnpm@7.1.0",
+  "version": "0.1.20",
+  "packageManager": "pnpm@7.1.1",
   "license": "MIT",
   "main": "./dist/module.cjs",
+  "module": "./dist/module.mjs",
   "types": "./dist/types.d.ts",
   "exports": {
     "./package.json": "./package.json",
@@ -25,6 +26,7 @@
     "prepublishOnly": "nr build",
     "build": "nuxt-module-build",
     "play": "nr build && nuxi dev playground",
+    "build:playground": "nuxi build playground",
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "release": "bumpp --commit --push --tag && pnpm publish",
@@ -34,8 +36,9 @@
     "@nuxt/kit": "^3.0.0-rc.3",
     "@trpc/client": "^9.23.3",
     "@trpc/server": "^9.23.2",
+    "@vueuse/core": "^8.5.0",
+    "@vueuse/nuxt": "^8.5.0",
     "defu": "^6.0.0",
-    "fs-extra": "^10.1.0",
     "h3": "^0.7.8",
     "pathe": "^0.3.0",
     "ufo": "^0.8.4"
@@ -44,12 +47,11 @@
     "@antfu/eslint-config": "^0.23.1",
     "@antfu/ni": "^0.16.2",
     "@nuxt/module-builder": "latest",
-    "@types/fs-extra": "^9.0.13",
     "bumpp": "^7.1.1",
     "eslint": "^8.14.0",
     "nuxt": "^3.0.0-rc.3",
     "ohash": "^0.1.0",
-    "pnpm": "^7.1.0",
+    "pnpm": "^7.1.1",
     "superjson": "^1.9.1",
     "trpc-nuxt": "workspace:*",
     "zod": "^3.16.0"

playground/app.vue

@@ -1,18 +1,5 @@
-<script setup lang="ts">
-const { data, pending, error } = await useAsyncQuery(['getUser', { username: 'jcena' }], {
-  lazy: false,
-  transform: data => data || null,
-})
-</script>
-
 <template>
-  <div v-if="pending">
-    Loading...
-  </div>
-  <div v-else-if="error">
-    Error: {{ JSON.stringify(error, null, 2) }}
-  </div>
-  <div v-else>
-    User {{ JSON.stringify(data, null, 2) }}
+  <div>
+    <NuxtPage />
   </div>
 </template>

playground/nuxt.config.ts

@@ -1,5 +1,5 @@
 import { defineNuxtConfig } from 'nuxt'
-import Module from '..'
+import Module from '../src/module'
 
 // https://v3.nuxtjs.org/api/configuration/nuxt.config
 export default defineNuxtConfig({

playground/pages/cookie.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+const counter = useCookie('counter')
+counter.value = counter.value || Math.round(Math.random() * 1000)
+</script>
+
+<template>
+  <div>
+    <h1> Counter: {{ counter || '-' }}</h1>
+    <button @click="counter = null">
+      reset
+    </button>
+    <button @click="counter--">
+      -
+    </button>
+    <button @click="counter++">
+      +
+    </button>
+  </div>
+</template>

playground/pages/index.vue

@@ -0,0 +1,64 @@
+<script setup lang="ts">
+const client = useClient()
+const headers = useClientHeaders()
+const { data: todos, pending, error, refresh } = await useAsyncQuery(['getTodos'])
+
+const addHeader = () => {
+  // headers.value.cookie = 'counter=69'
+  console.log(headers.value)
+}
+
+const addTodo = async () => {
+  const title = Math.random().toString(36).slice(2, 7)
+
+  try {
+    const result = await client.mutation('addTodo', {
+      id: Date.now(),
+      userId: 69,
+      title,
+      completed: false,
+    })
+    console.log('Todo: ', result)
+  }
+  catch (e) {
+    console.log(e)
+  }
+}
+</script>
+
+<template>
+  <div v-if="pending">
+    Loading...
+  </div>
+  <div v-else-if="error?.data?.code">
+    Error: {{ error.data.code }}
+  </div>
+  <div v-else-if="todos">
+    <ul>
+      <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>
+    </ul>
+    <button @click="addTodo">
+      Add Todo
+    </button>
+    <button @click="() => refresh()">
+      Refresh
+    </button>
+    <button @click="addHeader">
+      Add header
+    </button>
+  </div>
+</template>
+
+<style>
+a {
+  text-decoration: none;
+}
+
+.completed {
+  text-decoration: line-through;
+}
+</style>

playground/pages/todo/[id].vue

@@ -0,0 +1,18 @@
+<script setup lang="ts">
+const route = useRoute()
+const { data: todo, pending, error } = await useAsyncQuery(['getTodo', Number(route.params.id)])
+</script>
+
+<template>
+  <div v-if="pending">
+    Loading...
+  </div>
+  <div v-else-if="error?.data?.code">
+    {{ error.data.code }}
+  </div>
+  <div v-else>
+    ID: {{ todo.id }} <br>
+    Title: {{ todo.title }} <br>
+    Completed: {{ todo.completed }}
+  </div>
+</template>

playground/server/trpc/index.ts

@@ -1,82 +1,53 @@
-// ~/server/trpc/index.ts
-import { ZodError, z } from 'zod'
 import * as trpc from '@trpc/server'
 import type { inferAsyncReturnType } from '@trpc/server'
+import { z } from 'zod'
 import type { CompatibilityEvent } from 'h3'
-import type { ResponseMetaFnPayload } from 'trpc-nuxt/api'
-// import superjson from 'superjson'
+import { useCookies } from 'h3'
 
-const fakeUsers = [
-  { id: 1, username: 'jcena' },
-  { id: 2, username: 'dbatista' },
-  { id: 3, username: 'jbiden' },
-]
+const baseURL = 'https://jsonplaceholder.typicode.com'
 
-export const router = trpc
-  .router<inferAsyncReturnType<typeof createContext>>()
-  .formatError(({ shape, error }) => {
-    return {
-      ...shape,
-      data: {
-        ...shape.data,
-        zodError:
-          error.code === 'BAD_REQUEST'
-          && error.cause instanceof ZodError
-            ? error.cause.flatten()
-            : null,
-      },
-    }
-  })
-  .query('getUsers', {
-    resolve() {
-      return fakeUsers
+const TodoShape = z.object({
+  userId: z.number(),
+  id: z.number(),
+  title: z.string(),
+  completed: z.boolean(),
+})
+
+export type Todo = z.infer<typeof TodoShape>
+
+export const router = trpc.router<Context>()
+  .query('getTodos', {
+    async resolve() {
+      return await $fetch<Todo[]>(`${baseURL}/todos`)
     },
   })
-  .query('getUser', {
-    // validate input with Zod
-    input: z.object({
-      username: z.string().min(5),
-    }),
-    resolve(req) {
-      return fakeUsers.find(i => i.username === req.input.username) ?? null
+  .query('getTodo', {
+    input: z.number(),
+    async resolve(req) {
+      return await $fetch<Todo>(`${baseURL}/todos/${req.input}`)
     },
   })
-  .mutation('createUser', {
-    input: z.object({ username: z.string().min(5) }),
-    resolve(req) {
-      const newUser = {
-        id: fakeUsers.length + 1,
-        username: req.input.username,
-      }
-      fakeUsers.push(newUser)
-      return newUser
+  .mutation('addTodo', {
+    input: TodoShape,
+    async resolve(req) {
+      return await $fetch<Todo>(`${baseURL}/todos`, {
+        method: 'POST',
+        body: req.input,
+      })
     },
   })
 
-export const createContext = (event: CompatibilityEvent) => {
-  event.res.setHeader('x-ssr', 1)
-  return {}
+export async function createContext(event: CompatibilityEvent) {
+  // Create your context based on the request object
+  // Will be available as `ctx` in all your resolvers
+
+  // This is just an example of something you'd might want to do in your ctx fn
+  // const x = useCookies(event)
+  console.log(event.req.headers)
+
+  return {
+
+  }
 }
 
-export const responseMeta = (opts: ResponseMetaFnPayload<any>) => {
-  // const nuxtApp = useNuxtApp()
-  // const client = useClient()
-  // console.log(opts)
-
-  // if (nuxtApp.nuxtState) {
-  //   nuxtApp.nuxtState.trpc = client.runtime.transformer.serialize({
-  //     ctx: opts.ctx,
-  //     errors: opts.errors,
-  //   })
-  // }
-  // else {
-  //   nuxtApp.nuxtState = {
-  //     trpc: client.runtime.transformer.serialize({
-  //       ctx: opts.ctx,
-  //       errors: opts.errors,
-  //     }),
-  //   }
-  // }
-
-  return {}
-}
+  type Context = inferAsyncReturnType<typeof createContext>

pnpm-lock.yaml

@@ -10,16 +10,16 @@ importers:
       '@nuxt/module-builder': latest
       '@trpc/client': ^9.23.3
       '@trpc/server': ^9.23.2
-      '@types/fs-extra': ^9.0.13
+      '@vueuse/core': ^8.5.0
+      '@vueuse/nuxt': ^8.5.0
       bumpp: ^7.1.1
       defu: ^6.0.0
       eslint: ^8.14.0
-      fs-extra: ^10.1.0
       h3: ^0.7.8
       nuxt: ^3.0.0-rc.3
       ohash: ^0.1.0
       pathe: ^0.3.0
-      pnpm: ^7.1.0
+      pnpm: ^7.1.1
       superjson: ^1.9.1
       trpc-nuxt: workspace:*
       ufo: ^0.8.4
@@ -28,8 +28,9 @@ importers:
       '@nuxt/kit': 3.0.0-rc.3
       '@trpc/client': 9.23.4_@trpc+server@9.23.4
       '@trpc/server': 9.23.4
+      '@vueuse/core': 8.5.0
+      '@vueuse/nuxt': 8.5.0
       defu: 6.0.0
-      fs-extra: 10.1.0
       h3: 0.7.8
       pathe: 0.3.0
       ufo: 0.8.4
@@ -37,7 +38,6 @@ importers:
       '@antfu/eslint-config': 0.23.1_eslint@8.15.0
       '@antfu/ni': 0.16.2
       '@nuxt/module-builder': 0.1.7
-      '@types/fs-extra': 9.0.13
       bumpp: 7.1.1
       eslint: 8.15.0
       nuxt: 3.0.0-rc.3
@@ -945,12 +945,6 @@ packages:
     resolution: {integrity: sha512-CuPgU6f3eT/XgKKPqKd/gLZV1Xmvf1a2R5POBOGQa6uv82xpls89HU5zKeVoyR8XzHd1RGNOlQlvUe3CFkjWNQ==}
     dev: true
 
-  /@types/fs-extra/9.0.13:
-    resolution: {integrity: sha512-nEnwB++1u5lVDM2UI4c1+5R+FYaKfaAzS4OococimjVm3nQw3TuzH5UNsocrcTBbhnerblyHj4A49qXbIiZdpA==}
-    dependencies:
-      '@types/node': 17.0.34
-    dev: true
-
   /@types/jsdom/16.2.14:
     resolution: {integrity: sha512-6BAy1xXEmMuHeAJ4Fv4yXKwBDTGTOseExKE3OaHiNycdHdZw59KfYzrt0DkDluvwmik1HRt6QS7bImxUmpSy+w==}
     dependencies:
@@ -1274,6 +1268,22 @@ packages:
     resolution: {integrity: sha512-UBc1Pg1T3yZ97vsA2ueER0F6GbJebLHYlEi4ou1H5YL4KWvMOOWwpYo9/QpWq93wxKG6Wo13IY74Hcn/f7c7Bg==}
     dev: true
 
+  /@vueuse/core/8.5.0:
+    resolution: {integrity: sha512-VEJ6sGNsPlUp0o9BGda2YISvDZbhWJSOJu5zlp2TufRGVrLcYUKr31jyFEOj6RXzG3k/H4aCYeZyjpItfU8glw==}
+    peerDependencies:
+      '@vue/composition-api': ^1.1.0
+      vue: ^2.6.0 || ^3.2.0
+    peerDependenciesMeta:
+      '@vue/composition-api':
+        optional: true
+      vue:
+        optional: true
+    dependencies:
+      '@vueuse/metadata': 8.5.0
+      '@vueuse/shared': 8.5.0
+      vue-demi: 0.12.5
+    dev: false
+
   /@vueuse/head/0.7.6_vue@3.2.33:
     resolution: {integrity: sha512-cOWqCkT3WiF5oEpw+VVEWUJd9RLD5rc7DmnFp3cePsejp+t7686uKD9Z9ZU7Twb7R/BI8iexKTmXo9D/F3v6UA==}
     peerDependencies:
@@ -1282,6 +1292,42 @@ packages:
       vue: 3.2.33
     dev: true
 
+  /@vueuse/metadata/8.5.0:
+    resolution: {integrity: sha512-WxsD+Cd+bn+HcjpY6Dl9FJ8ywTRTT9pTwk3bCQpzEhXVYAyNczKDSahk50fCfIJKeWHhyI4B2+/ZEOxQAkUr0g==}
+    dev: false
+
+  /@vueuse/nuxt/8.5.0:
+    resolution: {integrity: sha512-riGrDwlTQbjSDxyw46oc1catXpZwzzRrEk+PTy8NQZG6uevgJ8wNuAhPVx/5oG0jYG/t2orIFfc9xGEA6uytSg==}
+    dependencies:
+      '@nuxt/kit': 3.0.0-rc.3
+      '@vueuse/core': 8.5.0
+      '@vueuse/metadata': 8.5.0
+      local-pkg: 0.4.1
+      vue-demi: 0.12.5
+    transitivePeerDependencies:
+      - '@vue/composition-api'
+      - esbuild
+      - rollup
+      - supports-color
+      - vite
+      - vue
+      - webpack
+    dev: false
+
+  /@vueuse/shared/8.5.0:
+    resolution: {integrity: sha512-qKG+SZb44VvGD4dU5cQ63z4JE2Yk39hQUecR0a9sEdJA01cx+XrxAvFKJfPooxwoiqalAVw/ktWK6xbyc/jS3g==}
+    peerDependencies:
+      '@vue/composition-api': ^1.1.0
+      vue: ^2.6.0 || ^3.2.0
+    peerDependenciesMeta:
+      '@vue/composition-api':
+        optional: true
+      vue:
+        optional: true
+    dependencies:
+      vue-demi: 0.12.5
+    dev: false
+
   /abbrev/1.1.1:
     resolution: {integrity: sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==}
     dev: true
@@ -3216,6 +3262,7 @@ packages:
       graceful-fs: 4.2.10
       jsonfile: 6.1.0
       universalify: 2.0.0
+    dev: true
 
   /fs-memo/1.2.0:
     resolution: {integrity: sha512-YEexkCpL4j03jn5SxaMHqcO6IuWuqm8JFUYhyCep7Ao89JIYmB8xoKhK7zXXJ9cCaNXpyNH5L3QtAmoxjoHW2w==}
@@ -3930,6 +3977,7 @@ packages:
       universalify: 2.0.0
     optionalDependencies:
       graceful-fs: 4.2.10
+    dev: true
 
   /jsx-ast-utils/3.3.0:
     resolution: {integrity: sha512-XzO9luP6L0xkxwhIJMTJQpZo/eeN60K08jHdexfD569AGxeNug6UketeHXEhROoM8aR7EcUoOQmIhcJQjcuq8Q==}
@@ -6333,6 +6381,7 @@ packages:
   /universalify/2.0.0:
     resolution: {integrity: sha512-hAZsKq7Yy11Zu1DE0OzWjw7nnLZmJZYTDZZyEFHZdUhV8FkH5MCfoU1XMaxXovpyW5nq5scPqq0ZDP9Zyl04oQ==}
     engines: {node: '>= 10.0.0'}
+    dev: true
 
   /unplugin/0.6.3:
     resolution: {integrity: sha512-CoW88FQfCW/yabVc4bLrjikN9HC8dEvMU4O7B6K2jsYMPK0l6iAnd9dpJwqGcmXJKRCU9vwSsy653qg+RK0G6A==}
@@ -6568,6 +6617,19 @@ packages:
       bundle-runner: 0.0.1
     dev: true
 
+  /vue-demi/0.12.5:
+    resolution: {integrity: sha512-BREuTgTYlUr0zw0EZn3hnhC3I6gPWv+Kwh4MCih6QcAeaTlaIX0DwOVN0wHej7hSvDPecz4jygy/idsgKfW58Q==}
+    engines: {node: '>=12'}
+    hasBin: true
+    requiresBuild: true
+    peerDependencies:
+      '@vue/composition-api': ^1.0.0-rc.1
+      vue: ^3.0.0-0 || ^2.6.0
+    peerDependenciesMeta:
+      '@vue/composition-api':
+        optional: true
+    dev: false
+
   /vue-eslint-parser/8.3.0_eslint@8.15.0:
     resolution: {integrity: sha512-dzHGG3+sYwSf6zFBa0Gi9ZDshD7+ad14DGOdTLjruRVgZXe2J+DcZ9iUhyR48z5g1PqRa20yt3Njna/veLJL/g==}
     engines: {node: ^12.22.0 || ^14.17.0 || >=16.0.0}

recipes/inference-helpers.md

@@ -0,0 +1,80 @@
+## Inference Helpers
+
+`@trpc/server` exports the following helper types to assist with inferring these types from the `router` exported in `~/server/trpc/index.ts`:
+
+- `inferProcedureOutput<TProcedure>`
+- `inferProcedureInput<TProcedure>`
+- `inferSubscriptionOutput<TRouter, TPath>`
+
+```ts
+// ~/utils/trpc.ts
+import type { router } from '~/server/trpc/index.ts'
+
+type AppRouter = typeof router
+
+/**
+ * Enum containing all api query paths
+ */
+export type TQuery = keyof AppRouter['_def']['queries']
+
+/**
+ * Enum containing all api mutation paths
+ */
+export type TMutation = keyof AppRouter['_def']['mutations']
+
+/**
+ * Enum containing all api subscription paths
+ */
+export type TSubscription = keyof AppRouter['_def']['subscriptions']
+
+/**
+ * This is a helper method to infer the output of a query resolver
+ * @example type HelloOutput = InferQueryOutput<'hello'>
+ */
+export type InferQueryOutput<TRouteKey extends TQuery> = inferProcedureOutput<
+  AppRouter['_def']['queries'][TRouteKey]
+>
+
+/**
+ * This is a helper method to infer the input of a query resolver
+ * @example type HelloInput = InferQueryInput<'hello'>
+ */
+export type InferQueryInput<TRouteKey extends TQuery> = inferProcedureInput<
+  AppRouter['_def']['queries'][TRouteKey]
+>
+
+/**
+ * This is a helper method to infer the output of a mutation resolver
+ * @example type HelloOutput = InferMutationOutput<'hello'>
+ */
+export type InferMutationOutput<TRouteKey extends TMutation> =
+  inferProcedureOutput<AppRouter['_def']['mutations'][TRouteKey]>
+
+/**
+ * This is a helper method to infer the input of a mutation resolver
+ * @example type HelloInput = InferMutationInput<'hello'>
+ */
+export type InferMutationInput<TRouteKey extends TMutation> =
+  inferProcedureInput<AppRouter['_def']['mutations'][TRouteKey]>
+
+/**
+ * This is a helper method to infer the output of a subscription resolver
+ * @example type HelloOutput = InferSubscriptionOutput<'hello'>
+ */
+export type InferSubscriptionOutput<TRouteKey extends TSubscription> =
+  inferProcedureOutput<AppRouter['_def']['subscriptions'][TRouteKey]>
+
+/**
+ * This is a helper method to infer the asynchronous output of a subscription resolver
+ * @example type HelloAsyncOutput = InferAsyncSubscriptionOutput<'hello'>
+ */
+export type InferAsyncSubscriptionOutput<TRouteKey extends TSubscription> =
+  inferSubscriptionOutput<AppRouter, TRouteKey>
+
+/**
+ * This is a helper method to infer the input of a subscription resolver
+ * @example type HelloInput = InferSubscriptionInput<'hello'>
+ */
+export type InferSubscriptionInput<TRouteKey extends TSubscription> =
+  inferProcedureInput<AppRouter['_def']['subscriptions'][TRouteKey]>
+```

recipes/merging-routers.md

@@ -0,0 +1,46 @@
+# Merging Routers
+
+Writing all API-code in your code in the same file is not a great idea. It's easy to merge routers with other routers.
+
+Define your routes:
+
+```ts
+// ~/server/trpc/routes/posts.ts
+export const posts = trpc.router()
+  .query('list', {
+    resolve() {
+      // ..
+      return []
+    }
+  })
+```
+
+```ts
+// ~/server/trpc/routes/users.ts
+export const users = trpc.router()
+  .query('list', {
+    resolve() {
+      // ..
+      return []
+    }
+  })
+```
+
+```ts
+// ~/server/trpc/index.ts
+import { users } from './routes/users'
+import { posts } from './routes/posts'
+
+export const router = trpc.router()
+  .merge('user.', users) // prefix user procedures with "user."
+  .merge('post.', posts) // prefix post procedures with "post."
+```
+
+and use it like this:
+
+```html
+<script setup lang="ts">
+const { data: users } = await useAsyncQuery(['user.list'])
+const { data: posts } = await useAsyncQuery(['post.list'])
+</script>
+```

src/module.ts

@@ -1,9 +1,8 @@
 import { fileURLToPath } from 'url'
-import { dirname, join } from 'pathe'
+import { join, resolve } from 'pathe'
 import { defu } from 'defu'
 
-import { addServerHandler, defineNuxtModule } from '@nuxt/kit'
-import fs from 'fs-extra'
+import { addPlugin, addServerHandler, addTemplate, defineNuxtModule } from '@nuxt/kit'
 
 export interface ModuleOptions {
   baseURL: string
@@ -21,10 +20,13 @@ export default defineNuxtModule<ModuleOptions>({
   },
   async setup(options, nuxt) {
     const runtimeDir = fileURLToPath(new URL('./runtime', import.meta.url))
-    nuxt.options.build.transpile.push(runtimeDir)
+    nuxt.options.build.transpile.push(runtimeDir, '#build/trpc-handler')
 
-    const clientPath = join(nuxt.options.buildDir, 'trpc-client.ts')
     const handlerPath = join(nuxt.options.buildDir, 'trpc-handler.ts')
+    const trpcOptionsPath = join(nuxt.options.rootDir, 'server/trpc')
+
+    // Add vueuse
+    nuxt.options.modules.push('@vueuse/nuxt')
 
     // Final resolved configuration
     const finalConfig = nuxt.options.runtimeConfig.public.trpc = defu(nuxt.options.runtimeConfig.public.trpc, {
@@ -32,43 +34,36 @@ export default defineNuxtModule<ModuleOptions>({
       trpcURL: options.trpcURL,
     })
 
+    nuxt.hook('autoImports:extend', (imports) => {
+      imports.push(
+        { name: 'useClient', from: join(runtimeDir, 'client') },
+        { name: 'useAsyncQuery', from: join(runtimeDir, 'client') },
+        { name: 'useClientHeaders', from: join(runtimeDir, 'client') },
+      )
+    })
+
     addServerHandler({
       route: `${finalConfig.trpcURL}/*`,
       handler: handlerPath,
     })
 
-    nuxt.hook('autoImports:extend', (imports) => {
-      imports.push(
-        { name: 'useClient', from: clientPath },
-        { name: 'useAsyncQuery', from: join(runtimeDir, 'client') },
-      )
-    })
+    addPlugin(resolve(runtimeDir, 'plugin'))
 
-    await fs.ensureDir(dirname(clientPath))
-
-    await fs.writeFile(clientPath, `
-      import * as trpc from '@trpc/client'
-      import type { router } from '~/server/trpc'
-
-      const client = trpc.createTRPCClient<typeof router>({
-        url: '${finalConfig.baseURL}${finalConfig.trpcURL}',
-      })
+    addTemplate({
+      filename: 'trpc-handler.ts',
+      write: true,
+      getContents() {
+        return `
+          import { createTRPCHandler } from 'trpc-nuxt/api'
+          import * as functions from '${trpcOptionsPath}'
     
-      export const useClient = () => client
-    `)
-
-    await fs.writeFile(handlerPath, `
-      import { createTRPCHandler } from 'trpc-nuxt/api'
-      import { useRuntimeConfig } from '#imports'
-      import * as functions from '~/server/trpc'
-
-      const { trpc: { trpcURL } } = useRuntimeConfig().public
-
-      export default createTRPCHandler({
-        ...functions,
-        trpcURL 
-      })
-    `)
+          export default createTRPCHandler({
+            ...functions,
+            trpcURL: '${finalConfig.trpcURL}'
+          })
+        `
+      },
+    })
   },
 })
 

src/runtime/api.ts

@@ -58,8 +58,6 @@ export function createTRPCHandler<Router extends AnyRouter>({
 
     const $url = createURL(req.url)
 
-    event.context.hello = 'world'
-
     const httpResponse = await resolveHTTPResponse({
       router,
       req: {

src/runtime/client.ts

@@ -6,18 +6,16 @@ import type {
   _Transform,
 } from 'nuxt/dist/app/composables/asyncData'
 import type { ProcedureRecord, inferHandlerInput, inferProcedureInput, inferProcedureOutput } from '@trpc/server'
-import type { TRPCClientErrorLike } from '@trpc/client'
+import type { TRPCClient, TRPCClientErrorLike } from '@trpc/client'
 import { objectHash } from 'ohash'
-// @ts-expect-error: Resolved by Nuxt
-import { useAsyncData, useState } from '#imports'
-// @ts-expect-error: Resolved by Nuxt
-import { useClient } from '#build/trpc-client'
-// @ts-expect-error: Resolved by Nuxt
+import type { MaybeRef } from '@vueuse/core'
+import { useStorage } from '@vueuse/core'
+import { useAsyncData, useNuxtApp, useState } from '#app'
 import type { router } from '~/server/trpc'
 
 type AppRouter = typeof router
 
-type inferProcedures<
+export type inferProcedures<
   TObj extends ProcedureRecord<any, any, any, any, any, any>,
 > = {
   [TPath in keyof TObj]: {
@@ -26,11 +24,18 @@ type inferProcedures<
   };
 }
 
-type TQueries = AppRouter['_def']['queries']
-type TError = TRPCClientErrorLike<AppRouter>
+export type TQueries = AppRouter['_def']['queries']
+export type TError = TRPCClientErrorLike<AppRouter>
 
-type TQueryValues = inferProcedures<AppRouter['_def']['queries']>
+export type TQueryValues = inferProcedures<AppRouter['_def']['queries']>
 
+/**
+ * Additional header properties to pass to tRPC client.
+ *
+ * @see https://trpc.io/docs/vanilla
+ * @param pathAndInput tRPC client path and input.
+ * @param options Options to pass to useAsyncData.
+ */
 export async function useAsyncQuery<
   TPath extends keyof TQueryValues & string,
   TOutput extends TQueryValues[TPath]['output'] = TQueryValues[TPath]['output'],
@@ -40,16 +45,16 @@ export async function useAsyncQuery<
   pathAndInput: [path: TPath, ...args: inferHandlerInput<TQueries[TPath]>],
   options: AsyncDataOptions<TOutput, Transform, PickKeys> = {},
 ): Promise<AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, TError>> {
-  const client = useClient()
+  const { $client } = useNuxtApp()
   const key = `${pathAndInput[0]}-${objectHash(pathAndInput[1] ? JSON.stringify(pathAndInput[1]) : '')}`
   const serverError = useState<TError | null>(`error-${key}`, () => null)
   const { error, data, ...rest } = await useAsyncData(
     key,
-    () => client.query(...pathAndInput),
+    () => $client.query(...pathAndInput),
+    // @ts-expect-error: Internal
     options,
   )
 
-  // @ts-expect-error: Resolved by Nuxt
   if (process.server && error.value && !serverError.value)
     serverError.value = error.value as any
 
@@ -62,3 +67,23 @@ export async function useAsyncQuery<
     error: serverError,
   } as any
 }
+
+/**
+ * tRPC Client.
+ *
+ * @see https://trpc.io/docs/vanilla
+ */
+export function useClient(): TRPCClient<AppRouter> {
+  const { $client } = useNuxtApp()
+  return $client
+}
+
+/**
+ * Additional header properties to pass to tRPC client.
+ *
+ * @see https://github.com/trpc/trpc/discussions/1686
+ * @param initialValue
+ */
+export function useClientHeaders(initialValue?: MaybeRef<Record<string, any>>) {
+  return useStorage('trpc-nuxt-header', initialValue || {})
+}

src/runtime/plugin.ts

@@ -0,0 +1,30 @@
+import * as trpc from '@trpc/client'
+import { unref } from 'vue'
+import { useClientHeaders } from './client'
+import { defineNuxtPlugin, useRequestHeaders, useRuntimeConfig } from '#app'
+import type { router } from '~/server/trpc'
+
+declare type AppRouter = typeof router
+
+export default defineNuxtPlugin((nuxtApp) => {
+  const config = useRuntimeConfig().public.trpc
+  const headers = useRequestHeaders()
+  const otherHeaders = useClientHeaders()
+  const client = trpc.createTRPCClient<AppRouter>({
+    url: `${config.baseURL}${config.trpcURL}`,
+    headers: () => {
+      return {
+        ...unref(otherHeaders),
+        ...headers,
+      }
+    },
+  })
+
+  nuxtApp.provide('client', client)
+})
+
+declare module '#app' {
+  interface NuxtApp {
+    $client: trpc.TRPCClient<AppRouter>
+  }
+}