Mark app container ready after initial render#79
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Note Other AI code review bot(s) detectedCodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review. WalkthroughAdds a client-side React component that, after mount, uses a double requestAnimationFrame to set Changes
Sequence Diagram(s)sequenceDiagram
participant Root as RootLayout
participant Effect as AppReadyEffect
participant DOM as #app (DOM)
Root->>DOM: render <div id="app" data-ready="false">children + <AppReadyEffect/>
Note over Effect,DOM: on mount
Effect->>DOM: requestAnimationFrame (frame A)
Note right of Effect: schedules second rAF inside first
Effect->>DOM: requestAnimationFrame (frame B) (inside A)
Effect->>DOM: setAttribute data-ready="true" (on B)
Note over Effect,DOM: on unmount
Effect-->>DOM: cancel pending rAF(s) and setAttribute data-ready="false"
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Poem
Pre-merge checks and finishing touches❌ Failed checks (2 warnings)
✅ Passed checks (1 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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| <Providers> | ||
| {children} | ||
| <div id="app" data-ready="false"> | ||
| {children} | ||
| <AppReadyEffect /> | ||
| </div> |
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The wrapper sets data-ready="false" in JSX while AppReadyEffect flips it to true only once inside a useEffect([]). When Providers re-renders (for example on any client-side navigation or provider state change), React will reapply this JSX and set the attribute back to false, but the effect will not run again to mark it ready. Any CSS or scripts that rely on data-ready will see the app stuck in a non-ready state after the first navigation. Consider deriving the attribute from React state or rerunning the effect on updates so the flag remains accurate.
Useful? React with 👍 / 👎.
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Actionable comments posted: 2
📜 Review details
Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro
📒 Files selected for processing (2)
frontend/src/app/components/app-ready-effect.tsx(1 hunks)frontend/src/app/layout.tsx(2 hunks)
🧰 Additional context used
🧬 Code graph analysis (1)
frontend/src/app/layout.tsx (1)
frontend/src/app/components/app-ready-effect.tsx (1)
AppReadyEffect(13-34)
🔇 Additional comments (2)
frontend/src/app/layout.tsx (2)
28-28: AppReadyEffect placement is correct.Placing
<AppReadyEffect />after{children}ensures the effect hook runs after the children are rendered and mounted. This guarantees that thedata-readyattribute flip happens only after the initial content is in the DOM, which aligns with the PR objective.
26-29: Verify the new wrapper doesn't break existing CSS or duplicate IDs.The new
div#appwrapper changes the DOM structure. Ensure that:
- No other element uses
id="app"(which would cause duplicate IDs)- No CSS selectors depend on the previous DOM structure (e.g., direct child selectors targeting
Providers > *)Run the following script to check for potential conflicts:
| export default function AppReadyEffect() { | ||
| useEffect(() => { | ||
| const appRoot = document.getElementById('app') | ||
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| if (!appRoot) { | ||
| return | ||
| } | ||
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| let frame = requestAnimationFrame(() => { | ||
| frame = requestAnimationFrame(() => { | ||
| markReady(appRoot) | ||
| }) | ||
| }) | ||
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| return () => { | ||
| cancelAnimationFrame(frame) | ||
| resetReady(appRoot) | ||
| } | ||
| }, []) | ||
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| return null | ||
| } |
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🧹 Nitpick | 🔵 Trivial
Consider simplifying to single requestAnimationFrame.
The double requestAnimationFrame pattern defers execution until after the next browser paint. While this ensures all DOM updates are complete, a single requestAnimationFrame is typically sufficient for marking an element as ready after render. The double-rAF pattern is more commonly used when you need to read layout properties that must reflect applied CSS changes.
If you confirm that single rAF is sufficient, apply this diff:
- let frame = requestAnimationFrame(() => {
- frame = requestAnimationFrame(() => {
- markReady(appRoot)
- })
+ let frame = requestAnimationFrame(() => {
+ markReady(appRoot)
})However, if you need to guarantee that all layout effects and paints have completed before marking ready (e.g., for third-party tools or analytics), the double-rAF is appropriate and can remain as-is.
📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| export default function AppReadyEffect() { | |
| useEffect(() => { | |
| const appRoot = document.getElementById('app') | |
| if (!appRoot) { | |
| return | |
| } | |
| let frame = requestAnimationFrame(() => { | |
| frame = requestAnimationFrame(() => { | |
| markReady(appRoot) | |
| }) | |
| }) | |
| return () => { | |
| cancelAnimationFrame(frame) | |
| resetReady(appRoot) | |
| } | |
| }, []) | |
| return null | |
| } | |
| export default function AppReadyEffect() { | |
| useEffect(() => { | |
| const appRoot = document.getElementById('app') | |
| if (!appRoot) { | |
| return | |
| } | |
| let frame = requestAnimationFrame(() => { | |
| markReady(appRoot) | |
| }) | |
| return () => { | |
| cancelAnimationFrame(frame) | |
| resetReady(appRoot) | |
| } | |
| }, []) | |
| return null | |
| } |
🤖 Prompt for AI Agents
In frontend/src/app/components/app-ready-effect.tsx around lines 13 to 34 the
component uses a double requestAnimationFrame to defer markReady, which can be
simplified: replace the nested requestAnimationFrame calls with a single
requestAnimationFrame that calls markReady(appRoot), store that frame id in the
same variable, and keep the existing cleanup to cancelAnimationFrame(frame) and
call resetReady(appRoot); ensure you still bail out if appRoot is missing and
that frame is defined before canceling.
| let frame = requestAnimationFrame(() => { | ||
| frame = requestAnimationFrame(() => { | ||
| markReady(appRoot) | ||
| }) | ||
| }) | ||
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| return () => { | ||
| cancelAnimationFrame(frame) | ||
| resetReady(appRoot) | ||
| } |
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Fix frame cancellation to handle nested requestAnimationFrame.
The current cleanup logic has a subtle race condition. When frame is reassigned on line 22, the outer requestAnimationFrame ID is lost. If the component unmounts between the first and second frame callback, only the second frame will be canceled, leaving the first callback to execute and potentially call markReady on an unmounted component.
Apply this diff to track both frame IDs separately:
- let frame = requestAnimationFrame(() => {
- frame = requestAnimationFrame(() => {
+ let frame1: number | undefined
+ let frame2: number | undefined
+
+ frame1 = requestAnimationFrame(() => {
+ frame2 = requestAnimationFrame(() => {
markReady(appRoot)
})
})
return () => {
- cancelAnimationFrame(frame)
+ if (frame1 !== undefined) cancelAnimationFrame(frame1)
+ if (frame2 !== undefined) cancelAnimationFrame(frame2)
resetReady(appRoot)
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| let frame = requestAnimationFrame(() => { | |
| frame = requestAnimationFrame(() => { | |
| markReady(appRoot) | |
| }) | |
| }) | |
| return () => { | |
| cancelAnimationFrame(frame) | |
| resetReady(appRoot) | |
| } | |
| let frame1: number | undefined | |
| let frame2: number | undefined | |
| frame1 = requestAnimationFrame(() => { | |
| frame2 = requestAnimationFrame(() => { | |
| markReady(appRoot) | |
| }) | |
| }) | |
| return () => { | |
| if (frame1 !== undefined) cancelAnimationFrame(frame1) | |
| if (frame2 !== undefined) cancelAnimationFrame(frame2) | |
| resetReady(appRoot) | |
| } |
🤖 Prompt for AI Agents
In frontend/src/app/components/app-ready-effect.tsx around lines 21 to 30, the
cleanup cancels only the last requestAnimationFrame ID because the outer frame
ID is overwritten; store the outer and inner frame IDs in separate variables
(e.g., outerFrame and innerFrame), assign outerFrame from the first
requestAnimationFrame and innerFrame from the nested one, and in the return
cleanup cancel both cancelAnimationFrame(outerFrame) and
cancelAnimationFrame(innerFrame) and still call resetReady(appRoot).
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Actionable comments posted: 1
♻️ Duplicate comments (1)
frontend/src/app/components/app-ready-effect.tsx (1)
21-30: Reminder: Frame cancellation issue remains unresolved.The frame ID reassignment issue flagged in previous reviews still exists. When
frameis reassigned on line 22, the outerrequestAnimationFrameID is lost, creating a race condition if the component unmounts between callbacks.Refer to the previous review comment for the suggested fix using separate variables for both frame IDs.
| useEffect(() => { | ||
| const appRoot = document.getElementById('app') | ||
|
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||
| if (!appRoot) { | ||
| return | ||
| } | ||
|
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| let frame = requestAnimationFrame(() => { | ||
| frame = requestAnimationFrame(() => { | ||
| markReady(appRoot) | ||
| }) | ||
| }) | ||
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| return () => { | ||
| cancelAnimationFrame(frame) | ||
| resetReady(appRoot) | ||
| } | ||
| }) |
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Critical: Add empty dependency array to run effect only on mount.
The useEffect lacks a dependency array, causing it to execute after every render. This creates performance issues and unnecessary DOM manipulations, as new requestAnimationFrame callbacks are scheduled on each render cycle.
According to the PR objectives ("after the header and hero render"), the effect should run once on mount.
Apply this diff to fix the issue:
- useEffect(() => {
+ useEffect(() => {
const appRoot = document.getElementById('app')
if (!appRoot) {
return
}
let frame = requestAnimationFrame(() => {
frame = requestAnimationFrame(() => {
markReady(appRoot)
})
})
return () => {
cancelAnimationFrame(frame)
resetReady(appRoot)
}
- })
+ }, [])📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| useEffect(() => { | |
| const appRoot = document.getElementById('app') | |
| if (!appRoot) { | |
| return | |
| } | |
| let frame = requestAnimationFrame(() => { | |
| frame = requestAnimationFrame(() => { | |
| markReady(appRoot) | |
| }) | |
| }) | |
| return () => { | |
| cancelAnimationFrame(frame) | |
| resetReady(appRoot) | |
| } | |
| }) | |
| useEffect(() => { | |
| const appRoot = document.getElementById('app') | |
| if (!appRoot) { | |
| return | |
| } | |
| let frame = requestAnimationFrame(() => { | |
| frame = requestAnimationFrame(() => { | |
| markReady(appRoot) | |
| }) | |
| }) | |
| return () => { | |
| cancelAnimationFrame(frame) | |
| resetReady(appRoot) | |
| } | |
| }, []) |
🤖 Prompt for AI Agents
In frontend/src/app/components/app-ready-effect.tsx around lines 14 to 31, the
useEffect has no dependency array and therefore runs on every render; change the
hook to run only once on mount by adding an empty dependency array as the second
argument to useEffect (useEffect(() => { ... }, [])); keep the existing
requestAnimationFrame scheduling and the cleanup that cancels the frame and
calls resetReady(appRoot); if your linter complains, add an inline
eslint-disable-next-line react-hooks/exhaustive-deps comment above the effect or
explicitly include any stable values needed.
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Note Docstrings generation - SUCCESS |
…ect` Docstrings generation was requested by @shayancoin. * #79 (comment) The following files were modified: * `frontend/src/app/components/app-ready-effect.tsx` * `frontend/src/app/layout.tsx`
…ect` (#135) Docstrings generation was requested by @shayancoin. * #79 (comment) The following files were modified: * `frontend/src/app/components/app-ready-effect.tsx` * `frontend/src/app/layout.tsx` Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
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https://chatgpt.com/codex/tasks/task_e_68f12bec1ca0833097eeed4b15d11abe
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