⚡ Bolt: Optimize LogsView rendering with React.memo#85
⚡ Bolt: Optimize LogsView rendering with React.memo#85Dexploarer wants to merge 1 commit intomainfrom
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Extracted log entries into a memoized `LogEntryRow` component to prevent re-renders of the entire list when unrelated state (e.g., search query, filters) changes. Implemented a custom comparison function `areLogEntriesEqual` to handle deep equality checks for log entry objects, ensuring efficient updates even with new object references. Impact: - Reduces re-renders of log rows when filtering or receiving new logs. - Improves responsiveness of the logs view, especially with large log volumes.
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Summary of ChangesHello @Dexploarer, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly improves the rendering performance of the Highlights
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| filteredLogs.map((entry: LogEntry) => ( | ||
| <div | ||
| <LogEntryRow | ||
| key={`${entry.timestamp}-${entry.source}-${entry.level}-${entry.message}`} |
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The key for each LogEntryRow is constructed as ${entry.timestamp}-${entry.source}-${entry.level}-${entry.message}. This approach does not guarantee uniqueness if multiple log entries share the same values for these fields, which could lead to React key collisions and rendering inconsistencies.
Recommendation: If possible, use a unique identifier (such as a log entry ID) for the key. If such an ID is not available, consider including an array index as a fallback, or ensure that the combination of fields used is always unique.
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| if (pTags.length !== nTags.length) return false; | ||
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| for (let i = 0; i < pTags.length; i++) { | ||
| if (pTags[i] !== nTags[i]) return false; | ||
| } |
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The tag comparison in areLogEntriesEqual is order-sensitive: it returns false if the order of tags differs, even if the sets are otherwise identical. If the tags array is not guaranteed to be ordered, this could cause unnecessary re-renders or missed updates.
Recommendation: If tag order is not significant, compare tags as sets (e.g., by sorting before comparison or using a Set for equality check). If order is significant, document this assumption clearly.
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Code Review
This pull request effectively optimizes the LogsView component by extracting LogEntryRow and memoizing it with React.memo. This is a great performance improvement that will prevent unnecessary re-renders. The implementation is well done. I've pointed out a potential bug in the list key generation that could lead to issues with duplicate keys, and I've also suggested a small improvement for better code maintainability and typing.
| filteredLogs.map((entry: LogEntry) => ( | ||
| <div | ||
| <LogEntryRow | ||
| key={`${entry.timestamp}-${entry.source}-${entry.level}-${entry.message}`} |
There was a problem hiding this comment.
The current key generation might not be unique. If two log entries are identical except for their tags, they will end up with the same key, which can lead to rendering issues and warnings in React. To ensure uniqueness, the tags should also be included in the key.
key={`${entry.timestamp}-${entry.source}-${entry.level}-${entry.message}-${(entry.tags ?? []).join(',')}`}
| function areLogEntriesEqual( | ||
| prevProps: { entry: LogEntry }, | ||
| nextProps: { entry: LogEntry }, | ||
| ) { | ||
| const p = prevProps.entry; | ||
| const n = nextProps.entry; | ||
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| if (p === n) return true; | ||
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| if ( | ||
| p.timestamp !== n.timestamp || | ||
| p.level !== n.level || | ||
| p.source !== n.source || | ||
| p.message !== n.message | ||
| ) { | ||
| return false; | ||
| } | ||
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| const pTags = p.tags ?? []; | ||
| const nTags = n.tags ?? []; | ||
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| if (pTags.length !== nTags.length) return false; | ||
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| for (let i = 0; i < pTags.length; i++) { | ||
| if (pTags[i] !== nTags[i]) return false; | ||
| } | ||
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| return true; | ||
| } | ||
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| // Optimized row component to prevent re-renders when parent state changes (e.g. search filter) | ||
| const LogEntryRow = memo(function LogEntryRow({ entry }: { entry: LogEntry }) { |
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For better type safety and reusability, it's a good practice to define a Props type for the LogEntryRow component and use it in both the component definition and the areLogEntriesEqual comparison function.
type LogEntryRowProps = {
entry: LogEntry;
};
function areLogEntriesEqual(
prevProps: LogEntryRowProps,
nextProps: LogEntryRowProps,
) {
const p = prevProps.entry;
const n = nextProps.entry;
if (p === n) return true;
if (
p.timestamp !== n.timestamp ||
p.level !== n.level ||
p.source !== n.source ||
p.message !== n.message
) {
return false;
}
const pTags = p.tags ?? [];
const nTags = n.tags ?? [];
if (pTags.length !== nTags.length) return false;
for (let i = 0; i < pTags.length; i++) {
if (pTags[i] !== nTags[i]) return false;
}
return true;
}
// Optimized row component to prevent re-renders when parent state changes (e.g. search filter)
const LogEntryRow = memo(function LogEntryRow({ entry }: LogEntryRowProps) {
1 participant
💡 What: Extracted
LogEntryRowcomponent and wrapped it inReact.memowith a custom comparison function.🎯 Why: To prevent unnecessary re-renders of log entries when the parent component updates, improving performance in the logs view.
📊 Impact: Reduces re-renders significantly during filtering and log updates.
🔬 Measurement: Verified with
tscto ensure type correctness. Full test suite could not be run due to environment issues, but the change is a standard React optimization pattern.PR created automatically by Jules for task 15666202315655600775 started by @Dexploarer