nuxt · pi0 · Jul 7, 2022 · May 12, 2022 · May 12, 2022 · May 12, 2022
diff --git a/.eslintrc b/.eslintrc
@@ -22,6 +22,7 @@
     "jsdoc/require-param": "off",
     "jsdoc/require-returns": "off",
     "jsdoc/require-param-type": "off",
+    "no-redeclare": "off",
     "import/no-restricted-paths": [
       "error",
       {

diff --git a/docs/content/3.api/1.composables/use-async-data.md b/docs/content/3.api/1.composables/use-async-data.md
@@ -5,13 +5,17 @@ Within your pages, components, and plugins you can use useAsyncData to get acces
 ## Type
 
 ```ts [Signature]
+function useAsyncData(
+  handler: (nuxtApp?: NuxtApp) => Promise<DataT>,
+  options?: AsyncDataOptions<DataT>
+): AsyncData<DataT>
 function useAsyncData(
   key: string,
   handler: (nuxtApp?: NuxtApp) => Promise<DataT>,
-  options?: AsyncDataOptions
-): Promise<DataT>
+  options?: AsyncDataOptions<DataT>
+): Promise<AsyncData<DataT>>
 
-type AsyncDataOptions = {
+type AsyncDataOptions<DataT> = {
   server?: boolean
   lazy?: boolean
   default?: () => DataT | Ref<DataT>
@@ -21,7 +25,7 @@ type AsyncDataOptions = {
   initialCache?: boolean
 }
 
-type DataT = {
+type AsyncData<DataT> = {
   data: Ref<DataT>
   pending: Ref<boolean>
   refresh: () => Promise<void>
@@ -31,7 +35,7 @@ type DataT = {
 
 ## Params
 
-* **key**: a unique key to ensure that data fetching can be properly de-duplicated across requests
+* **key**: a unique key to ensure that data fetching can be properly de-duplicated across requests. If you do not provide a key, then a key that is unique to the file name and line number of the instance of `useAsyncData` will be generated for you.
 * **handler**: an asynchronous function that returns a value
 * **options**:
   * _lazy_: whether to resolve the async function after loading the route, instead of blocking navigation (defaults to `false`)

diff --git a/docs/content/3.api/1.composables/use-fetch.md b/docs/content/3.api/1.composables/use-fetch.md
@@ -6,9 +6,9 @@ This composable provides a convenient wrapper around [`useAsyncData`](/api/compo
 
 ```ts [Signature]
 function useFetch(
-  url: string | Request,
-  options?: UseFetchOptions
-): Promise<DataT>
+  url: string | Request | Ref<string | Request> | () => string | Request,
+  options?: UseFetchOptions<DataT>
+): Promise<AsyncData<DataT>>
 
 type UseFetchOptions = {
   key?: string,
@@ -25,7 +25,7 @@ type UseFetchOptions = {
   watch?: WatchSource[]
 }
 
-type DataT = {
+type AsyncData<DataT> = {
   data: Ref<DataT>
   pending: Ref<boolean>
   refresh: () => Promise<void>
@@ -51,6 +51,10 @@ type DataT = {
   * `watch`: watch reactive sources to auto-refresh
   * `transform`: A function that can be used to alter `handler` function result after resolving.
 
+::alert{type=warning}
+If you provide a function or ref as the `url` parameter, or if you provide functions as arguments to the `options` parameter, then the `useFetch` call will not match other `useFetch` calls elsewhere in your codebase, even if the options seem to be identical. If you wish to force a match, you may provide your own key in `options`.
+::
+
 ## Return values
 
 * **data**: the result of the asynchronous function that is passed in

diff --git a/docs/content/3.api/1.composables/use-state.md b/docs/content/3.api/1.composables/use-state.md
@@ -1,10 +1,11 @@
 # `useState`
 
 ```ts
+useState<T>(init?: () => T | Ref<T>): Ref<T>
 useState<T>(key: string, init?: () => T | Ref<T>): Ref<T>
 ```
 
-* **key**: A unique key ensuring that data fetching is properly de-duplicated across requests
+* **key**: A unique key ensuring that data fetching is properly de-duplicated across requests. If you do not provide a key, then a key that is unique to the file and line number of the instance of `useState` will be generated for you.
 * **init**: A function that provides initial value for the state when not initiated. This function can also return a `Ref`.
 * **T**: (typescript only) Specify the type of state
 

diff --git a/examples/composables/use-async-data/components/CounterExample.vue b/examples/composables/use-async-data/components/CounterExample.vue
@@ -1,6 +1,6 @@
 <script setup>
 const ctr = ref(0)
-const { data, pending, refresh } = await useAsyncData('/api/hello', () => $fetch(`/api/hello/${ctr.value}`), { watch: [ctr] })
+const { data, pending, refresh } = await useAsyncData(() => $fetch(`/api/hello/${ctr.value}`), { watch: [ctr] })
 
 </script>
 

diff --git a/package.json b/package.json
@@ -20,8 +20,8 @@
     "lint": "eslint --ext .vue,.ts,.js,.mjs .",
     "lint:docs": "markdownlint ./docs/content && case-police 'docs/content**/*.md'",
     "lint:docs:fix": "markdownlint ./docs/content --fix && case-police 'docs/content**/*.md' --fix",
-    "nuxi": "NUXT_TELEMETRY_DISABLED=1 node ./packages/nuxi/bin/nuxi.mjs",
-    "nuxt": "NUXT_TELEMETRY_DISABLED=1 node ./packages/nuxi/bin/nuxi.mjs",
+    "nuxi": "NUXT_TELEMETRY_DISABLED=1 JITI_ESM_RESOLVE=1 node ./packages/nuxi/bin/nuxi.mjs",
+    "nuxt": "NUXT_TELEMETRY_DISABLED=1 JITI_ESM_RESOLVE=1 node ./packages/nuxi/bin/nuxi.mjs",
     "play": "echo use yarn dev && exit 1",
     "release": "yarn && yarn lint && FORCE_COLOR=1 lerna publish -m \"chore: release\" && yarn stub",
     "stub": "lerna run prepack -- --stub",

diff --git a/packages/nuxt/src/app/composables/asyncData.ts b/packages/nuxt/src/app/composables/asyncData.ts
@@ -46,7 +46,15 @@ export interface _AsyncData<DataT, ErrorT> {
 export type AsyncData<Data, Error> = _AsyncData<Data, Error> & Promise<_AsyncData<Data, Error>>
 
 const getDefault = () => null
-
+export function useAsyncData<
+  DataT,
+  DataE = Error,
+  Transform extends _Transform<DataT> = _Transform<DataT, DataT>,
+  PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>
+> (
+  handler: (ctx?: NuxtApp) => Promise<DataT>,
+  options?: AsyncDataOptions<DataT, Transform, PickKeys>
+): AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, DataE | null | true>
 export function useAsyncData<
   DataT,
   DataE = Error,
@@ -55,14 +63,26 @@ export function useAsyncData<
 > (
   key: string,
   handler: (ctx?: NuxtApp) => Promise<DataT>,
-  options: AsyncDataOptions<DataT, Transform, PickKeys> = {}
-): AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, DataE | null | true> {
+  options?: AsyncDataOptions<DataT, Transform, PickKeys>
+): AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, DataE | null | true>
+export function useAsyncData<
+  DataT,
+  DataE = Error,
+  Transform extends _Transform<DataT> = _Transform<DataT, DataT>,
+  PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>
+> (...args): AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, DataE | null | true> {
+  const autoKey = typeof args[args.length - 1] === 'string' ? args.pop() : undefined
+  if (typeof args[0] !== 'string') { args.unshift(autoKey) }
+
+  // eslint-disable-next-line prefer-const
+  let [key, handler, options = {}] = args as [string, (ctx?: NuxtApp) => Promise<DataT>, AsyncDataOptions<DataT, Transform, PickKeys>]
+
   // Validate arguments
   if (typeof key !== 'string') {
-    throw new TypeError('asyncData key must be a string')
+    throw new TypeError('[nuxt] [asyncData] key must be a string.')
   }
   if (typeof handler !== 'function') {
-    throw new TypeError('asyncData handler must be a function')
+    throw new TypeError('[nuxt] [asyncData] handler must be a function.')
   }
 
   // Apply defaults
@@ -180,7 +200,15 @@ export function useAsyncData<
 
   return asyncDataPromise as AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, DataE>
 }
-
+export function useLazyAsyncData<
+  DataT,
+  DataE = Error,
+  Transform extends _Transform<DataT> = _Transform<DataT, DataT>,
+  PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>
+> (
+  handler: (ctx?: NuxtApp) => Promise<DataT>,
+  options?: Omit<AsyncDataOptions<DataT, Transform, PickKeys>, 'lazy'>
+): AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, DataE | null | true>
 export function useLazyAsyncData<
   DataT,
   DataE = Error,
@@ -189,9 +217,19 @@ export function useLazyAsyncData<
 > (
   key: string,
   handler: (ctx?: NuxtApp) => Promise<DataT>,
-  options: Omit<AsyncDataOptions<DataT, Transform, PickKeys>, 'lazy'> = {}
-): AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, DataE | null | true> {
-  return useAsyncData(key, handler, { ...options, lazy: true })
+  options?: Omit<AsyncDataOptions<DataT, Transform, PickKeys>, 'lazy'>
+): AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, DataE | null | true>
+export function useLazyAsyncData<
+  DataT,
+  DataE = Error,
+  Transform extends _Transform<DataT> = _Transform<DataT, DataT>,
+  PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>
+> (...args): AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, DataE | null | true> {
+  const autoKey = typeof args[args.length - 1] === 'string' ? args.pop() : undefined
+  if (typeof args[0] !== 'string') { args.unshift(autoKey) }
+  const [key, handler, options] = args as [string, (ctx?: NuxtApp) => Promise<DataT>, AsyncDataOptions<DataT, Transform, PickKeys>]
+  // @ts-ignore
+  return useAsyncData(key, handler, { ...options, lazy: true }, null)
 }
 
 export function refreshNuxtData (keys?: string | string[]): Promise<void> {

diff --git a/packages/nuxt/src/app/composables/fetch.ts b/packages/nuxt/src/app/composables/fetch.ts
@@ -1,8 +1,7 @@
 import type { FetchOptions, FetchRequest } from 'ohmyfetch'
 import type { TypedInternalResponse, NitroFetchRequest } from 'nitropack'
-import { hash } from 'ohash'
 import { computed, isRef, Ref } from 'vue'
-import type { AsyncDataOptions, _Transform, KeyOfRes } from './asyncData'
+import type { AsyncDataOptions, _Transform, KeyOfRes, AsyncData, PickFrom } from './asyncData'
 import { useAsyncData } from './asyncData'
 
 export type FetchResult<ReqT extends NitroFetchRequest> = TypedInternalResponse<ReqT, unknown>
@@ -24,12 +23,30 @@ export function useFetch<
   PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>
 > (
   request: Ref<ReqT> | ReqT | (() => ReqT),
-  opts: UseFetchOptions<_ResT, Transform, PickKeys> = {}
+  opts?: UseFetchOptions<_ResT, Transform, PickKeys>
+): AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, ErrorT | null | true>
+export function useFetch<
+  ResT = void,
+  ErrorT = Error,
+  ReqT extends NitroFetchRequest = NitroFetchRequest,
+  _ResT = ResT extends void ? FetchResult<ReqT> : ResT,
+  Transform extends (res: _ResT) => any = (res: _ResT) => _ResT,
+  PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>
+> (
+  request: Ref<ReqT> | ReqT | (() => ReqT),
+  arg1?: string | UseFetchOptions<_ResT, Transform, PickKeys>,
+  arg2?: string
 ) {
-  if (process.dev && !opts.key && Object.values(opts).some(v => typeof v === 'function' || v instanceof Blob)) {
-    console.warn('[nuxt] [useFetch] You should provide a key when passing options that are not serializable to JSON:', opts)
+  const [opts, autoKey] = typeof arg1 === 'string' ? [{}, arg1] : [arg1, arg2]
+  const _key = opts.key || autoKey
+  if (!_key || typeof _key !== 'string') {
+    throw new TypeError('[nuxt] [useFetch] key must be a string: ' + _key)
   }
-  const key = '$f_' + (opts.key || hash([request, { ...opts, transform: null }]))
+  if (!request) {
+    throw new Error('[nuxt] [useFetch] request is missing.')
+  }
+  const key = '$f' + _key
+
   const _request = computed(() => {
     let r = request as Ref<FetchRequest> | FetchRequest | (() => FetchRequest)
     if (typeof r === 'function') {
@@ -83,10 +100,26 @@ export function useLazyFetch<
   PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>
 > (
   request: Ref<ReqT> | ReqT | (() => ReqT),
-  opts: Omit<UseFetchOptions<_ResT, Transform, PickKeys>, 'lazy'> = {}
+  opts?: Omit<UseFetchOptions<_ResT, Transform, PickKeys>, 'lazy'>
+): AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, ErrorT | null | true>
+export function useLazyFetch<
+  ResT = void,
+  ErrorT = Error,
+  ReqT extends NitroFetchRequest = NitroFetchRequest,
+  _ResT = ResT extends void ? FetchResult<ReqT> : ResT,
+  Transform extends (res: _ResT) => any = (res: _ResT) => _ResT,
+  PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>
+> (
+  request: Ref<ReqT> | ReqT | (() => ReqT),
+  arg1?: string | Omit<UseFetchOptions<_ResT, Transform, PickKeys>, 'lazy'>,
+  arg2?: string
 ) {
+  const [opts, autoKey] = typeof arg1 === 'string' ? [{}, arg1] : [arg1, arg2]
+
   return useFetch<ResT, ErrorT, ReqT, _ResT, Transform, PickKeys>(request, {
     ...opts,
     lazy: true
-  })
+  },
+  // @ts-ignore
+  autoKey)
 }
diff --git a/packages/nuxt/src/app/composables/state.ts b/packages/nuxt/src/app/composables/state.ts
@@ -8,7 +8,20 @@ import { useNuxtApp } from '#app'
  * @param key a unique key ensuring that data fetching can be properly de-duplicated across requests
  * @param init a function that provides initial value for the state when it's not initiated
  */
-export const useState = <T> (key: string, init?: (() => T | Ref<T>)): Ref<T> => {
+export function useState <T> (key?: string, init?: (() => T | Ref<T>)): Ref<T>
+export function useState <T> (init?: (() => T | Ref<T>)): Ref<T>
+export function useState <T> (...args): Ref<T> {
+  const autoKey = typeof args[args.length - 1] === 'string' ? args.pop() : undefined
+  if (typeof args[0] !== 'string') { args.unshift(autoKey) }
+  const [_key, init] = args as [string, (() => T | Ref<T>)]
+  if (!_key || typeof _key !== 'string') {
+    throw new TypeError('[nuxt] [useState] key must be a string: ' + _key)
+  }
+  if (init !== undefined && typeof init !== 'function') {
+    throw new Error('[nuxt] [useState] init must be a function: ' + init)
+  }
+  const key = '$s' + _key
+
   const nuxt = useNuxtApp()
   const state = toRef(nuxt.payload.state, key)
   if (state.value === undefined && init) {

diff --git a/packages/vite/package.json b/packages/vite/package.json
@@ -29,13 +29,15 @@
     "defu": "^6.0.0",
     "esbuild": "^0.14.48",
     "escape-string-regexp": "^5.0.0",
+    "estree-walker": "^3.0.1",
     "externality": "^0.2.2",
     "fs-extra": "^10.1.0",
     "get-port-please": "^2.5.0",
     "h3": "^0.7.10",
     "knitwork": "^0.1.2",
     "magic-string": "^0.26.2",
     "mlly": "^0.5.4",
+    "ohash": "^0.1.0",
     "pathe": "^0.3.2",
     "perfect-debounce": "^0.1.3",
     "postcss": "^8.4.14",

diff --git a/packages/vite/src/plugins/composable-keys.ts b/packages/vite/src/plugins/composable-keys.ts
@@ -0,0 +1,55 @@
+import { pathToFileURL } from 'node:url'
+import { createUnplugin } from 'unplugin'
+import { isAbsolute, relative } from 'pathe'
+import { walk } from 'estree-walker'
+import MagicString from 'magic-string'
+import { hash } from 'ohash'
+import type { CallExpression } from 'estree'
+import { parseURL } from 'ufo'
+
+export interface ComposableKeysOptions {
+  sourcemap?: boolean
+  rootDir?: string
+}
+
+const keyedFunctions = [
+  'useState', 'useFetch', 'useAsyncData', 'useLazyAsyncData', 'useLazyFetch'
+]
+const KEYED_FUNCTIONS_RE = new RegExp(`(${keyedFunctions.join('|')})`)
+
+export const composableKeysPlugin = createUnplugin((options: ComposableKeysOptions = {}) => {
+  return {
+    name: 'nuxt:composable-keys',
+    enforce: 'post',
+    transform (code, id) {
+      const { pathname } = parseURL(decodeURIComponent(pathToFileURL(id).href))
+      if (!pathname.match(/\.(m?[jt]sx?|vue)/)) { return }
+      if (!KEYED_FUNCTIONS_RE.test(code)) { return }
+      const { 0: script = code, index: codeIndex = 0 } = code.match(/(?<=<script[^>]*>)[\S\s.]*?(?=<\/script>)/) || []
+      const s = new MagicString(code)
+      // https://github.com/unjs/unplugin/issues/90
+      const relativeID = isAbsolute(id) ? relative(options.rootDir, id) : id
+      walk(this.parse(script, {
+        sourceType: 'module',
+        ecmaVersion: 'latest'
+      }), {
+        enter (node: CallExpression) {
+          if (node.type !== 'CallExpression' || node.callee.type !== 'Identifier') { return }
+          if (keyedFunctions.includes(node.callee.name) && node.arguments.length < 4) {
+            const end = (node as any).end
+            s.appendLeft(
+              codeIndex + end - 1,
+              (node.arguments.length ? ', ' : '') + "'$" + hash(`${relativeID}-${codeIndex + end}`) + "'"
+            )
+          }
+        }
+      })
+      if (s.hasChanged()) {
+        return {
+          code: s.toString(),
+          map: options.sourcemap && s.generateMap({ source: id, includeContent: true })
+        }
+      }
+    }
+  }
+})
diff --git a/packages/vite/src/utils/index.ts b/packages/vite/src/utils/index.ts
@@ -1,5 +1,5 @@
-import { createHash } from 'node:crypto'
 import { promises as fsp, readdirSync, statSync } from 'node:fs'
+import { hash } from 'ohash'
 import { join } from 'pathe'
 
 export function uniq<T> (arr: T[]): T[] {
@@ -28,13 +28,6 @@ export function hashId (id: string) {
   return '$id_' + hash(id)
 }
 
-export function hash (input: string, length = 8) {
-  return createHash('sha256')
-    .update(input)
-    .digest('hex')
-    .slice(0, length)
-}
-
 export function readDirRecursively (dir: string) {
   return readdirSync(dir).reduce((files, file) => {
     const name = join(dir, file)