[Flight] Log error if prod elements are rendered #34189
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github-actions bot added the React Core Team 
eps1lon commented Aug 12, 2025
| 'Attempted to render <span key="one"> without development properties. This is not supported. It can happen if:' + | ||
| '\n- The element is created with a production version of React but rendered in development.' + | ||
| '\n- The element was cloned with a custom function instead of `React.cloneElement`.\n' + | ||
| "The props of this element may help locate this element: { children: 'Free!', [key]: [Getter] }", |
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Not the prettiest to include the legacy key getter but it gets the job done.
eps1lon commented Aug 12, 2025
| key = ' key="' + element.key + '"'; | ||
| } | ||
| | ||
| console.error( |
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We usually don't do conditional throws but maybe this here is a valid exception since we'll throw later anyway in dev when accessing .stack?
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We might fix that to not throw though and then it would become unbalanced.
sebmarkbage approved these changes Aug 13, 2025
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ch4og pushed a commit to csmplay/csm-mapban that referenced this pull request Nov 18, 2025
This PR contains the following updates: | Package | Change | Age | Confidence | |---|---|---|---| | [@types/react](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/react) ([source](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react)) | [`19.1.10` -> `19.2.6`](https://renovatebot.com/diffs/npm/@types%2freact/19.1.10/19.2.6) | [](https://docs.renovatebot.com/merge-confidence/) | [](https://docs.renovatebot.com/merge-confidence/) | | [@types/react-dom](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/react-dom) ([source](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-dom)) | [`19.1.7` -> `19.2.3`](https://renovatebot.com/diffs/npm/@types%2freact-dom/19.1.7/19.2.3) | [](https://docs.renovatebot.com/merge-confidence/) | [](https://docs.renovatebot.com/merge-confidence/) | | [react](https://react.dev/) ([source](https://github.com/facebook/react/tree/HEAD/packages/react)) | [`19.1.1` -> `19.2.0`](https://renovatebot.com/diffs/npm/react/19.1.1/19.2.0) | [](https://docs.renovatebot.com/merge-confidence/) | [](https://docs.renovatebot.com/merge-confidence/) | | [react-dom](https://react.dev/) ([source](https://github.com/facebook/react/tree/HEAD/packages/react-dom)) | [`19.1.1` -> `19.2.0`](https://renovatebot.com/diffs/npm/react-dom/19.1.1/19.2.0) | [](https://docs.renovatebot.com/merge-confidence/) | [](https://docs.renovatebot.com/merge-confidence/) | --- ### Release Notes <details> <summary>facebook/react (react)</summary> ### [`v19.2.0`](https://github.com/facebook/react/blob/HEAD/CHANGELOG.md#1920-October-1st-2025) [Compare Source](facebook/react@v19.1.1...v19.2.0) Below is a list of all new features, APIs, and bug fixes. Read the [React 19.2 release post](https://react.dev/blog/2025/10/01/react-19-2) for more information. ##### New React Features - [`<Activity>`](https://react.dev/reference/react/Activity): A new API to hide and restore the UI and internal state of its children. - [`useEffectEvent`](https://react.dev/reference/react/useEffectEvent) is a React Hook that lets you extract non-reactive logic into an [Effect Event](https://react.dev/learn/separating-events-from-effects#declaring-an-effect-event). - [`cacheSignal`](https://react.dev/reference/react/cacheSignal) (for RSCs) lets your know when the `cache()` lifetime is over. - [React Performance tracks](https://react.dev/reference/dev-tools/react-performance-tracks) appear on the Performance panel’s timeline in your browser developer tools ##### New React DOM Features - Added resume APIs for partial pre-rendering with Web Streams: - [`resume`](https://react.dev/reference/react-dom/server/resume): to resume a prerender to a stream. - [`resumeAndPrerender`](https://react.dev/reference/react-dom/static/resumeAndPrerender): to resume a prerender to HTML. - Added resume APIs for partial pre-rendering with Node Streams: - [`resumeToPipeableStream`](https://react.dev/reference/react-dom/server/resumeToPipeableStream): to resume a prerender to a stream. - [`resumeAndPrerenderToNodeStream`](https://react.dev/reference/react-dom/static/resumeAndPrerenderToNodeStream): to resume a prerender to HTML. - Updated [`prerender`](https://react.dev/reference/react-dom/static/prerender) APIs to return a `postponed` state that can be passed to the `resume` APIs. ##### Notable changes - React DOM now batches suspense boundary reveals, matching the behavior of client side rendering. This change is especially noticeable when animating the reveal of Suspense boundaries e.g. with the upcoming `<ViewTransition>` Component. React will batch as much reveals as possible before the first paint while trying to hit popular first-contentful paint metrics. - Add Node Web Streams (`prerender`, `renderToReadableStream`) to server-side-rendering APIs for Node.js - Use underscore instead of `:` IDs generated by useId ##### All Changes ##### React - `<Activity />` was developed over many years, starting before `ClassComponent.setState` ([@​acdlite](https://github.com/acdlite) [@​sebmarkbage](https://github.com/sebmarkbage) and many others) - Stringify context as "SomeContext" instead of "SomeContext.Provider" ([@​kassens](https://github.com/kassens) [#​33507](facebook/react#33507)) - Include stack of cause of React instrumentation errors with `%o` placeholder ([@​eps1lon](https://github.com/eps1lon) [#​34198](facebook/react#34198)) - Fix infinite `useDeferredValue` loop in popstate event ([@​acdlite](https://github.com/acdlite) [#​32821](facebook/react#32821)) - Fix a bug when an initial value was passed to `useDeferredValue` ([@​acdlite](https://github.com/acdlite) [#​34376](facebook/react#34376)) - Fix a crash when submitting forms with Client Actions ([@​sebmarkbage](https://github.com/sebmarkbage) [#​33055](facebook/react#33055)) - Hide/unhide the content of dehydrated suspense boundaries if they resuspend ([@​sebmarkbage](https://github.com/sebmarkbage) [#​32900](facebook/react#32900)) - Avoid stack overflow on wide trees during Hot Reload ([@​sophiebits](https://github.com/sophiebits) [#​34145](facebook/react#34145)) - Improve Owner and Component stacks in various places ([@​sebmarkbage](https://github.com/sebmarkbage), [@​eps1lon](https://github.com/eps1lon): [#​33629](facebook/react#33629), [#​33724](facebook/react#33724), [#​32735](facebook/react#32735), [#​33723](facebook/react#33723)) - Add `cacheSignal` ([@​sebmarkbage](https://github.com/sebmarkbage) [#​33557](facebook/react#33557)) ##### React DOM - Block on Suspensey Fonts during reveal of server-side-rendered content ([@​sebmarkbage](https://github.com/sebmarkbage) [#​33342](facebook/react#33342)) - Use underscore instead of `:` for IDs generated by `useId` ([@​sebmarkbage](https://github.com/sebmarkbage), [@​eps1lon](https://github.com/eps1lon): [#​32001](facebook/react#32001), [#​33342](https://github.com/facebook/react/pull/33342)[#​33099](https://github.com/facebook/react/pull/33099), [#​33422](facebook/react#33422)) - Stop warning when ARIA 1.3 attributes are used ([@​Abdul-Omira](https://github.com/Abdul-Omira) [#​34264](facebook/react#34264)) - Allow `nonce` to be used on hoistable styles ([@​Andarist](https://github.com/Andarist) [#​32461](facebook/react#32461)) - Warn for using a React owned node as a Container if it also has text content ([@​sebmarkbage](https://github.com/sebmarkbage) [#​32774](facebook/react#32774)) - s/HTML/text for for error messages if text hydration mismatches ([@​rickhanlonii](https://github.com/rickhanlonii) [#​32763](facebook/react#32763)) - Fix a bug with `React.use` inside `React.lazy`-ed Component ([@​hi-ogawa](https://github.com/hi-ogawa) [#​33941](facebook/react#33941)) - Enable the `progressiveChunkSize` option for server-side-rendering APIs ([@​sebmarkbage](https://github.com/sebmarkbage) [#​33027](facebook/react#33027)) - Fix a bug with deeply nested Suspense inside Suspense fallback when server-side-rendering ([@​gnoff](https://github.com/gnoff) [#​33467](facebook/react#33467)) - Avoid hanging when suspending after aborting while rendering ([@​gnoff](https://github.com/gnoff) [#​34192](facebook/react#34192)) - Add Node Web Streams to server-side-rendering APIs for Node.js ([@​sebmarkbage](https://github.com/sebmarkbage) [#​33475](facebook/react#33475)) ##### React Server Components - Preload `<img>` and `<link>` using hints before they're rendered ([@​sebmarkbage](https://github.com/sebmarkbage) [#​34604](facebook/react#34604)) - Log error if production elements are rendered during development ([@​eps1lon](https://github.com/eps1lon) [#​34189](facebook/react#34189)) - Fix a bug when returning a Temporary reference (e.g. a Client Reference) from Server Functions ([@​sebmarkbage](https://github.com/sebmarkbage) [#​34084](facebook/react#34084), [@​denk0403](https://github.com/denk0403) [#​33761](facebook/react#33761)) - Pass line/column to `filterStackFrame` ([@​eps1lon](https://github.com/eps1lon) [#​33707](facebook/react#33707)) - Support Async Modules in Turbopack Server References ([@​lubieowoce](https://github.com/lubieowoce) [#​34531](facebook/react#34531)) - Add support for .mjs file extension in Webpack ([@​jennyscript](https://github.com/jennyscript) [#​33028](facebook/react#33028)) - Fix a wrong missing key warning ([@​unstubbable](https://github.com/unstubbable) [#​34350](facebook/react#34350)) - Make console log resolve in predictable order ([@​sebmarkbage](https://github.com/sebmarkbage) [#​33665](facebook/react#33665)) ##### React Reconciler - [createContainer](https://github.com/facebook/react/blob/v19.2.0/packages/react-reconciler/src/ReactFiberReconciler.js#L255-L261) and [createHydrationContainer](https://github.com/facebook/react/blob/v19.2.0/packages/react-reconciler/src/ReactFiberReconciler.js#L305-L312) had their parameter order adjusted after `on*` handlers to account for upcoming experimental APIs </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 👻 **Immortal**: This PR will be recreated if closed unmerged. Get [config help](https://github.com/renovatebot/renovate/discussions) if that's undesired. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4xNDguNCIsInVwZGF0ZWRJblZlciI6IjQyLjEwLjUiLCJ0YXJnZXRCcmFuY2giOiJtYWluIiwibGFiZWxzIjpbXX0=--> Reviewed-on: https://git.in.csmpro.ru/csmpro/csm-mapban/pulls/36 Co-authored-by: Renovate Bot <renovate@csmpro.ru> Co-committed-by: Renovate Bot <renovate@csmpro.ru>
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We previously encountered these errors with MDX. The newest issue was a
lodash.cloneDeep(objWithReactElements).Example: