[Breaking] Remove deprecated sync access to Dynamic APIs

errors/sync-dynamic-apis.mdx

@@ -26,9 +26,6 @@ function Page({ params }) {
 This also includes enumerating (e.g. `{...params}`, or `Object.keys(params)`) or iterating over the return
 value of these APIs (e.g. `[...headers()]` or `for (const cookie of cookies())`, or explicitly with `cookies()[Symbol.iterator]()`).
 
-In the version of Next.js that issued this warning, access to these properties is still possible directly but will warn.
-In future versions, these APIs will be async and direct access will not work as expected.
-
 ## Possible Ways to Fix It
 
 The [`next-async-request-api` codemod](/docs/app/guides/upgrading/codemods#next-async-request-api) can fix many of these cases automatically:

packages/next/errors.json

@@ -824,5 +824,28 @@
   "823": "Timeout waiting for error state from frontend. The browser may not be responding to HMR messages.",
   "824": "URL is required in MCP browser response. This is a bug in Next.js.",
   "825": "Timeout waiting for response from frontend. The browser may not be responding to HMR messages.",
-  "826": "unknown bundler: %s"
+  "826": "unknown bundler: %s",
+  "827": "Route %s used \\`connection()\\` inside \\`after()\\`. The \\`connection()\\` function is used to indicate the subsequent code must only run when there is an actual Request, but \\`after()\\` executes after the request, so this function is not allowed in this scope. See more info here: https://nextjs.org/docs/canary/app/api-reference/functions/after",
+  "828": "Route %s with \\`dynamic = \"error\"\\` couldn't be rendered statically because it used \\`headers()\\`. See more info here: https://nextjs.org/docs/app/building-your-application/rendering/static-and-dynamic#dynamic-rendering",
+  "829": "Route %s used \"%s\" inside \"use cache\". The enabled status of \\`draftMode()\\` can be read in caches but you must not enable or disable \\`draftMode()\\` inside a cache. See more info here: https://nextjs.org/docs/messages/next-request-in-use-cache",
+  "830": "%sused %s. \\`cookies()\\` returns a Promise and must be unwrapped with \\`await\\` or \\`React.use()\\` before accessing its properties. Learn more: https://nextjs.org/docs/messages/sync-dynamic-apis",
+  "831": "Route %s used \\`cookies()\\` inside \"use cache\". Accessing Dynamic data sources inside a cache scope is not supported. If you need this data inside a cached function use \\`cookies()\\` outside of the cached function and pass the required dynamic data in as an argument. See more info here: https://nextjs.org/docs/messages/next-request-in-use-cache",
+  "832": "%s must not be used within a Client Component. Next.js should be preventing %s from being included in Client Components statically, but did not in this case.",
+  "833": "Route %s used \\`headers()\\` inside \"use cache\". Accessing Dynamic data sources inside a cache scope is not supported. If you need this data inside a cached function use \\`headers()\\` outside of the cached function and pass the required dynamic data in as an argument. See more info here: https://nextjs.org/docs/messages/next-request-in-use-cache",
+  "834": "%sused %s. \\`params\\` is a Promise and must be unwrapped with \\`await\\` or \\`React.use()\\` before accessing its properties. Learn more: https://nextjs.org/docs/messages/sync-dynamic-apis",
+  "835": "%sused %s. \\`draftMode()\\` returns a Promise and must be unwrapped with \\`await\\` or \\`React.use()\\` before accessing its properties. Learn more: https://nextjs.org/docs/messages/sync-dynamic-apis",
+  "836": "%sused %s. \\`headers()\\` returns a Promise and must be unwrapped with \\`await\\` or \\`React.use()\\` before accessing its properties. Learn more: https://nextjs.org/docs/messages/sync-dynamic-apis",
+  "837": "Route %s used \\`connection()\\` inside \"use cache: private\". The \\`connection()\\` function is used to indicate the subsequent code must only run when there is an actual navigation request, but caches must be able to be produced before a navigation request, so this function is not allowed in this scope. See more info here: https://nextjs.org/docs/messages/next-request-in-use-cache",
+  "838": "Route %s used \\`headers()\\` inside a function cached with \\`unstable_cache()\\`. Accessing Dynamic data sources inside a cache scope is not supported. If you need this data inside a cached function use \\`headers()\\` outside of the cached function and pass the required dynamic data in as an argument. See more info here: https://nextjs.org/docs/app/api-reference/functions/unstable_cache",
+  "839": "Route %s used \\`headers()\\` inside \\`after()\\`. This is not supported. If you need this data inside an \\`after()\\` callback, use \\`headers()\\` outside of the callback. See more info here: https://nextjs.org/docs/canary/app/api-reference/functions/after",
+  "840": "Route %s used \\`connection()\\` inside a function cached with \\`unstable_cache()\\`. The \\`connection()\\` function is used to indicate the subsequent code must only run when there is an actual Request, but caches must be able to be produced before a Request so this function is not allowed in this scope. See more info here: https://nextjs.org/docs/app/api-reference/functions/unstable_cache",
+  "841": "Route %s used \\`connection()\\` inside \"use cache\". The \\`connection()\\` function is used to indicate the subsequent code must only run when there is an actual request, but caches must be able to be produced before a request, so this function is not allowed in this scope. See more info here: https://nextjs.org/docs/messages/next-request-in-use-cache",
+  "842": "Route %s used \\`searchParams\\` inside \"use cache\". Accessing dynamic request data inside a cache scope is not supported. If you need some search params inside a cached function await \\`searchParams\\` outside of the cached function and pass only the required search params as arguments to the cached function. See more info here: https://nextjs.org/docs/messages/next-request-in-use-cache",
+  "843": "Route %s used \\`cookies()\\` inside \\`after()\\`. This is not supported. If you need this data inside an \\`after()\\` callback, use \\`cookies()\\` outside of the callback. See more info here: https://nextjs.org/docs/canary/app/api-reference/functions/after",
+  "844": "Route %s used \"%s\" inside a function cached with \\`unstable_cache()\\`. The enabled status of \\`draftMode()\\` can be read in caches but you must not enable or disable \\`draftMode()\\` inside a cache. See more info here: https://nextjs.org/docs/app/api-reference/functions/unstable_cache",
+  "845": "Route %s used \"%s\" inside \\`after()\\`. The enabled status of \\`draftMode()\\` can be read inside \\`after()\\` but you cannot enable or disable \\`draftMode()\\`. See more info here: https://nextjs.org/docs/app/api-reference/functions/after",
+  "846": "Route %s used \\`cookies()\\` inside a function cached with \\`unstable_cache()\\`. Accessing Dynamic data sources inside a cache scope is not supported. If you need this data inside a cached function use \\`cookies()\\` outside of the cached function and pass the required dynamic data in as an argument. See more info here: https://nextjs.org/docs/app/api-reference/functions/unstable_cache",
+  "847": "Route %s with \\`dynamic = \"error\"\\` couldn't be rendered statically because it used \\`connection()\\`. See more info here: https://nextjs.org/docs/app/building-your-application/rendering/static-and-dynamic#dynamic-rendering",
+  "848": "%sused %s. \\`searchParams\\` is a Promise and must be unwrapped with \\`await\\` or \\`React.use()\\` before accessing its properties. Learn more: https://nextjs.org/docs/messages/sync-dynamic-apis",
+  "849": "Route %s with \\`dynamic = \"error\"\\` couldn't be rendered statically because it used \\`cookies()\\`. See more info here: https://nextjs.org/docs/app/building-your-application/rendering/static-and-dynamic#dynamic-rendering"
 }

packages/next/server.d.ts

@@ -16,5 +16,3 @@ export type { ImageResponseOptions } from 'next/dist/compiled/@vercel/og/types'
 export { after } from 'next/dist/server/after'
 export { unstable_rootParams } from 'next/dist/server/request/root-params'
 export { connection } from 'next/dist/server/request/connection'
-export type { UnsafeUnwrappedSearchParams } from 'next/dist/server/request/search-params'
-export type { UnsafeUnwrappedParams } from 'next/dist/server/request/params'

packages/next/src/build/webpack/plugins/next-types-plugin/index.ts

@@ -423,8 +423,6 @@ function createServerDefinitions(
     export type { ImageResponseOptions } from 'next/dist/compiled/@vercel/og/types'
     export { after } from 'next/dist/server/after'
     export { connection } from 'next/dist/server/request/connection'
-    export type { UnsafeUnwrappedSearchParams } from 'next/dist/server/request/search-params'
-    export type { UnsafeUnwrappedParams } from 'next/dist/server/request/params'
     export function unstable_rootParams(): Promise<{ ${rootParams
       .map(
         ({ param, optional }) =>

packages/next/src/client/request/params.browser.dev.ts

@@ -1,7 +1,6 @@
 import type { Params } from '../../server/request/params'
 
 import { ReflectAdapter } from '../../server/web/spec-extension/adapters/reflect'
-import { InvariantError } from '../../shared/lib/invariant-error'
 import {
   describeStringPropertyAccess,
   wellKnownProperties,
@@ -10,63 +9,6 @@ import {
 interface CacheLifetime {}
 const CachedParams = new WeakMap<CacheLifetime, Promise<Params>>()
 
-function makeDynamicallyTrackedExoticParamsWithDevWarnings(
-  underlyingParams: Params
-): Promise<Params> {
-  const cachedParams = CachedParams.get(underlyingParams)
-  if (cachedParams) {
-    return cachedParams
-  }
-
-  // We don't use makeResolvedReactPromise here because params
-  // supports copying with spread and we don't want to unnecessarily
-  // instrument the promise with spreadable properties of ReactPromise.
-  const promise = Promise.resolve(underlyingParams)
-
-  const proxiedProperties = new Set<string>()
-  const unproxiedProperties: Array<string> = []
-
-  Object.keys(underlyingParams).forEach((prop) => {
-    if (wellKnownProperties.has(prop)) {
-      // These properties cannot be shadowed because they need to be the
-      // true underlying value for Promises to work correctly at runtime
-    } else {
-      proxiedProperties.add(prop)
-      ;(promise as any)[prop] = underlyingParams[prop]
-    }
-  })
-
-  const proxiedPromise = new Proxy(promise, {
-    get(target, prop, receiver) {
-      if (typeof prop === 'string') {
-        if (
-          // We are accessing a property that was proxied to the promise instance
-          proxiedProperties.has(prop)
-        ) {
-          const expression = describeStringPropertyAccess('params', prop)
-          warnForSyncAccess(expression)
-        }
-      }
-      return ReflectAdapter.get(target, prop, receiver)
-    },
-    set(target, prop, value, receiver) {
-      if (typeof prop === 'string') {
-        proxiedProperties.delete(prop)
-      }
-      return ReflectAdapter.set(target, prop, value, receiver)
-    },
-    ownKeys(target) {
-      warnForEnumeration(unproxiedProperties)
-      return Reflect.ownKeys(target)
-    },
-  })
-
-  CachedParams.set(underlyingParams, proxiedPromise)
-  return proxiedPromise
-}
-
-// Similar to `makeDynamicallyTrackedExoticParamsWithDevWarnings`, but just
-// logging the sync access without actually defining the params on the promise.
 function makeDynamicallyTrackedParamsWithDevWarnings(
   underlyingParams: Params
 ): Promise<Params> {
@@ -81,7 +23,6 @@ function makeDynamicallyTrackedParamsWithDevWarnings(
   const promise = Promise.resolve(underlyingParams)
 
   const proxiedProperties = new Set<string>()
-  const unproxiedProperties: Array<string> = []
 
   Object.keys(underlyingParams).forEach((prop) => {
     if (wellKnownProperties.has(prop)) {
@@ -112,7 +53,7 @@ function makeDynamicallyTrackedParamsWithDevWarnings(
       return ReflectAdapter.set(target, prop, value, receiver)
     },
     ownKeys(target) {
-      warnForEnumeration(unproxiedProperties)
+      warnForEnumeration()
       return Reflect.ownKeys(target)
     },
   })
@@ -123,55 +64,22 @@ function makeDynamicallyTrackedParamsWithDevWarnings(
 
 function warnForSyncAccess(expression: string) {
   console.error(
-    `A param property was accessed directly with ${expression}. \`params\` is now a Promise and should be unwrapped with \`React.use()\` before accessing properties of the underlying params object. In this version of Next.js direct access to param properties is still supported to facilitate migration but in a future version you will be required to unwrap \`params\` with \`React.use()\`.`
+    `A param property was accessed directly with ${expression}. ` +
+      `\`params\` is a Promise and must be unwrapped with \`React.use()\` before accessing its properties. ` +
+      `Learn more: https://nextjs.org/docs/messages/sync-dynamic-apis`
   )
 }
 
-function warnForEnumeration(missingProperties: Array<string>) {
-  if (missingProperties.length) {
-    const describedMissingProperties =
-      describeListOfPropertyNames(missingProperties)
-    console.error(
-      `params are being enumerated incompletely missing these properties: ${describedMissingProperties}. ` +
-        `\`params\` should be unwrapped with \`React.use()\` before using its value. ` +
-        `Learn more: https://nextjs.org/docs/messages/sync-dynamic-apis`
-    )
-  } else {
-    console.error(
-      `params are being enumerated. ` +
-        `\`params\` should be unwrapped with \`React.use()\` before using its value. ` +
-        `Learn more: https://nextjs.org/docs/messages/sync-dynamic-apis`
-    )
-  }
-}
-
-function describeListOfPropertyNames(properties: Array<string>) {
-  switch (properties.length) {
-    case 0:
-      throw new InvariantError(
-        'Expected describeListOfPropertyNames to be called with a non-empty list of strings.'
-      )
-    case 1:
-      return `\`${properties[0]}\``
-    case 2:
-      return `\`${properties[0]}\` and \`${properties[1]}\``
-    default: {
-      let description = ''
-      for (let i = 0; i < properties.length - 1; i++) {
-        description += `\`${properties[i]}\`, `
-      }
-      description += `, and \`${properties[properties.length - 1]}\``
-      return description
-    }
-  }
+function warnForEnumeration() {
+  console.error(
+    `params are being enumerated. ` +
+      `\`params\` is a Promise and must be unwrapped with \`React.use()\` before accessing its properties. ` +
+      `Learn more: https://nextjs.org/docs/messages/sync-dynamic-apis`
+  )
 }
 
 export function createRenderParamsFromClient(
   clientParams: Params
 ): Promise<Params> {
-  if (process.env.__NEXT_CACHE_COMPONENTS) {
-    return makeDynamicallyTrackedParamsWithDevWarnings(clientParams)
-  }
-
-  return makeDynamicallyTrackedExoticParamsWithDevWarnings(clientParams)
+  return makeDynamicallyTrackedParamsWithDevWarnings(clientParams)
 }

packages/next/src/client/request/params.browser.prod.ts

@@ -1,30 +1,8 @@
 import type { Params } from '../../server/request/params'
-import { wellKnownProperties } from '../../shared/lib/utils/reflect-utils'
 
 interface CacheLifetime {}
 const CachedParams = new WeakMap<CacheLifetime, Promise<Params>>()
 
-function makeUntrackedExoticParams(underlyingParams: Params): Promise<Params> {
-  const cachedParams = CachedParams.get(underlyingParams)
-  if (cachedParams) {
-    return cachedParams
-  }
-
-  const promise = Promise.resolve(underlyingParams)
-  CachedParams.set(underlyingParams, promise)
-
-  Object.keys(underlyingParams).forEach((prop) => {
-    if (wellKnownProperties.has(prop)) {
-      // These properties cannot be shadowed because they need to be the
-      // true underlying value for Promises to work correctly at runtime
-    } else {
-      ;(promise as any)[prop] = underlyingParams[prop]
-    }
-  })
-
-  return promise
-}
-
 function makeUntrackedParams(underlyingParams: Params): Promise<Params> {
   const cachedParams = CachedParams.get(underlyingParams)
   if (cachedParams) {
@@ -40,9 +18,5 @@ function makeUntrackedParams(underlyingParams: Params): Promise<Params> {
 export function createRenderParamsFromClient(
   clientParams: Params
 ): Promise<Params> {
-  if (process.env.__NEXT_CACHE_COMPONENTS) {
-    return makeUntrackedParams(clientParams)
-  }
-
-  return makeUntrackedExoticParams(clientParams)
+  return makeUntrackedParams(clientParams)
 }