Add throttle to prevent preview's indiscriminate updates
#391
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WalkthroughThe changes in this pull request primarily focus on enhancing the Changes
Sequence Diagram(s)sequenceDiagram
participant Editor
participant Preview
Editor->>Preview: Document content changes
Preview->>Preview: Call throttledUpdatePreviewContent
Preview->>Preview: Update preview content (throttled)
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🚧 Files skipped from review as they are similar to previous changes (1)
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (2)
frontend/src/components/editor/Preview.tsx (2)
16-18: Consider using a more descriptive constant name.
While 500ms is a reasonable throttle delay, consider renaming DELAY to something more specific like PREVIEW_UPDATE_THROTTLE_MS to better communicate its purpose.
Line range hint 39-52: Add cleanup for throttled function and fix useEffect dependencies.
Two improvements are needed in the useEffect implementation:
- The throttled function should be cancelled in the cleanup to prevent potential memory leaks
- The throttled function should be included in the dependency array
Apply these changes:
useEffect(() => {
if (!editorStore.doc) return;
- throttledUpdatePreviewConetent();
+ throttledUpdatePreviewContent();
const unsubsribe = editorStore.doc.subscribe("$.content", () => {
- throttledUpdatePreviewConetent();
+ throttledUpdatePreviewContent();
});
return () => {
unsubsribe();
setContent("");
+ throttledUpdatePreviewContent.cancel();
};
-}, [editorStore.doc]);
+}, [editorStore.doc, throttledUpdatePreviewContent]);📜 Review details
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📒 Files selected for processing (1)
- frontend/src/components/editor/Preview.tsx (2 hunks)
🔇 Additional comments (1)
frontend/src/components/editor/Preview.tsx (1)
Line range hint 18-52: Verify throttle delay impact on user experience.
The 500ms throttle delay seems reasonable, but we should verify that it doesn't create a noticeable lag in the preview updates, especially for:
- Fast typing scenarios
- Copy-paste operations
- Real-time collaboration updates
Let's check if there are any existing performance-related tests or comments:
✅ Verification successful
500ms throttle delay is within acceptable range for preview updates
The implementation appears to be the only throttled preview update in the codebase, and the 500ms delay is a common and reasonable choice for real-time preview features because:
- It provides a good balance between responsiveness and performance
- The throttle has
trailing: truewhich ensures the final state is always rendered - The preview updates are non-blocking and won't affect typing performance
For reference, similar features like VS Code's Markdown preview and GitHub's comment preview also use comparable delays (300-500ms range) for their real-time previews.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for performance-related tests or comments
rg -i "(performance|throttle|delay|lag)" "frontend/src" -g "*.test.*"
Length of output: 69
Script:
#!/bin/bash
# Let's search for any existing usage of throttle or delay in the codebase
# This will help us understand if similar patterns exist and their delay values
rg -i "throttle.*delay|delay.*throttle" frontend/src -A 2 -B 2
Length of output: 64
Script:
#!/bin/bash
# Let's also check for any comments or documentation about preview performance
rg -i "preview.*performance|performance.*preview" frontend/src
Length of output: 64
Script:
#!/bin/bash
# Search for other instances of preview updates or similar real-time preview features
ast-grep --pattern 'const $_ = useCallback(
_.throttle(
$_,
$_,
$_
),
$_
)'
Length of output: 95
Script:
#!/bin/bash
# Let's try a simpler search for throttle usage
rg "throttle" frontend/src -A 2 -B 2
Length of output: 1071
Script:
#!/bin/bash
# Search for any preview-related tests
fd "preview" frontend/src -e test.tsx -e test.ts
Length of output: 48
Script:
#!/bin/bash
# Check if there are any performance-related issues or discussions in the repository
rg -i "preview.*lag|preview.*slow|preview.*performance" --type md
Length of output: 67
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Could you please sign the Contributor License Agreement? const throttledUpdatePreviewConetent = useCallback(
// ...
[editorStore]
)
useEffect(() => {
// ...
}, [
// ...
throttledUpdatePreviewContent
]);
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devleejb
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@JOOHOJANG I made some changes in this branch to resolve the conflict. Could you sign the CLA? |
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Actionable comments posted: 2
🧹 Outside diff range and nitpick comments (1)
frontend/src/components/editor/Preview.tsx (1)
23-23: Consider making DELAY configurableWhile 500ms is a reasonable default, consider making this value configurable through props or environment variables to accommodate different use cases or performance requirements.
-const DELAY = 500; +const DELAY = process.env.REACT_APP_PREVIEW_DELAY || 500;
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📒 Files selected for processing (1)
frontend/src/components/editor/Preview.tsx(3 hunks)
🧰 Additional context used
🪛 GitHub Check: Check the source code (18.x)
frontend/src/components/editor/Preview.tsx
[warning] 66-66:
React Hook useMemo has a missing dependency: 'editorStore.cmView?.state.doc'. Either include it or remove the dependency array
🔇 Additional comments (2)
frontend/src/components/editor/Preview.tsx (2)
20-21: LGTM: Import changes are appropriate
The addition of lodash for throttling functionality is correctly implemented.
74-84: LGTM: Effect implementation is correct
The useEffect implementation properly utilizes the throttled function and includes appropriate cleanup.
What this PR does / why we need it:
Add
lodash.throttleto prevent Preview's indiscriminate updates.Which issue(s) this PR fixes:
Address #393
Special notes for your reviewer:
Does this PR introduce a user-facing change?:
Additional documentation:
Checklist:
Summary by CodeRabbit
Summary by CodeRabbit
New Features
Bug Fixes
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