Apply incremental dom update #397
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Actionable comments posted: 8
🧹 Outside diff range and nitpick comments (3)
frontend/package.json (1)
42-42: Consider implementing dependency monitoringGiven the significant number of new markdown-related dependencies, consider:
- Setting up dependency monitoring for security updates
- Adding a package.json comment documenting the purpose of each markdown-related package
- Creating an upgrade strategy document for these interconnected packages
Consider adding a comment block at the top of package.json:
+ /** + * Markdown Processing Dependencies: + * - markdown-it: Core markdown parser + * - markdown-it-incremental-dom: Enables incremental DOM updates + * - markdown-it-sanitizer: Security sanitization + * - markdown-it-prism: Syntax highlighting + * - @vscode/markdown-it-katex: Math formula rendering + */Also applies to: 89-89
frontend/src/components/editor/preview.css (2)
1-111: Consider adding fallback values for CSS custom properties.The theme implementation is comprehensive, but browser compatibility could be improved by adding fallback values to CSS custom properties.
Example modification:
- --color-fg-default: #c9d1d9; + --color-fg-default: #c9d1d9; /* Add fallback */ + color: #c9d1d9; + color: var(--color-fg-default, #c9d1d9);
302-302: Remove duplicate font names in font-family declarations.The static analysis tool correctly identified redundant font names in the font-family declarations.
Remove duplicate font names:
- font-family: monospace, monospace; + font-family: monospace; - font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace; + font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, Liberation Mono, monospace;Also applies to: 425-425, 471-471, 564-564, 577-577
🧰 Tools
🪛 Biome
[error] 302-302: Duplicate font names are redundant and unnecessary: monospace
Remove duplicate font names within the property
(lint/suspicious/noDuplicateFontNames)
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⛔ Files ignored due to path filters (1)
pnpm-lock.yamlis excluded by!**/pnpm-lock.yaml
📒 Files selected for processing (3)
frontend/package.json(4 hunks)frontend/src/components/editor/Preview.tsx(2 hunks)frontend/src/components/editor/preview.css(1 hunks)
🧰 Additional context used
🪛 GitHub Check: Check the source code (18.x)
frontend/src/components/editor/Preview.tsx
[warning] 72-72:
React Hook useEffect has an unnecessary dependency: 'md'. Either exclude it or remove the dependency array. Outer scope values like 'md' aren't valid dependencies because mutating them doesn't re-render the component
🪛 Biome
frontend/src/components/editor/preview.css
[error] 302-302: Duplicate font names are redundant and unnecessary: monospace
Remove duplicate font names within the property
(lint/suspicious/noDuplicateFontNames)
[error] 425-425: Duplicate font names are redundant and unnecessary: Mono
Remove duplicate font names within the property
(lint/suspicious/noDuplicateFontNames)
[error] 471-471: Duplicate font names are redundant and unnecessary: Mono
Remove duplicate font names within the property
(lint/suspicious/noDuplicateFontNames)
[error] 564-564: Duplicate font names are redundant and unnecessary: Mono
Remove duplicate font names within the property
(lint/suspicious/noDuplicateFontNames)
[error] 577-577: Duplicate font names are redundant and unnecessary: Mono
Remove duplicate font names within the property
(lint/suspicious/noDuplicateFontNames)
🔇 Additional comments (4)
frontend/package.json (3)
57-60: LGTM: Comprehensive markdown-it setup with security considerations
The markdown-it ecosystem setup includes all necessary components for secure and feature-rich markdown rendering, including sanitization, syntax highlighting, and math support.
52-52: LGTM: Supporting utilities are properly configured
The additional utilities (hast-util-to-html and refractor) are appropriate choices for HTML generation and syntax highlighting support.
Also applies to: 79-79
53-53: Verify incremental-dom integration and performance
The incremental-dom setup looks correct, but since this is a major architectural change, we should verify:
- Performance improvements with large documents
- Memory usage patterns
- Compatibility with existing features
Also applies to: 58-58
✅ Verification successful
Incremental-DOM integration appears well-implemented
The implementation in Preview.tsx shows:
- Correct setup with markdown-it and incremental-dom integration
- Proper patch/render cycle in useEffect
- Content updates handled efficiently with subscriptions
- Appropriate sanitization and security measures in place
The integration follows best practices:
- Uses incremental DOM's patch mechanism for efficient updates
- Properly disposes subscriptions on unmount
- Includes necessary security plugins (markdown-it-sanitizer)
- Handles loading states gracefully
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check if there are any known issues or breaking changes with incremental-dom
gh search issues "incremental-dom breaking changes" --repo google/incremental-dom
gh search issues "markdown-it-incremental-dom performance" --repo yhatt/markdown-it-incremental-dom
Length of output: 185
Script:
#!/bin/bash
# Let's check for actual usage of incremental-dom in the codebase
rg -l "incremental-dom" --type js --type ts
# Check for any performance-related code or benchmarks
rg -l "performance|benchmark" --type js --type ts
# Look for DOM manipulation patterns
ast-grep --pattern 'import $_ from "incremental-dom"'
# Check for markdown-it integration
rg -l "markdown-it-incremental-dom" --type js --type ts
Length of output: 411
Script:
#!/bin/bash
# Let's examine the actual implementation in Preview.tsx
cat frontend/src/components/editor/Preview.tsx
# Check if there are any test files related to Preview
fd "Preview.test" --type f
# Look for any error handling related to incremental-dom
rg "error|catch" frontend/src/components/editor/Preview.tsx
Length of output: 2676
frontend/src/components/editor/Preview.tsx (1)
33-35:
Verify sanitizer configuration to prevent XSS vulnerabilities
Enabling html: true in the MarkdownIt configuration allows HTML content, which could introduce XSS risks. Ensure that markdown-it-sanitizer is properly configured to sanitize all potentially malicious input.
Please review the configuration and adjust if necessary to enhance security.
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Actionable comments posted: 0
🧹 Outside diff range and nitpick comments (3)
frontend/src/components/editor/Preview.tsx (3)
19-19: Replace require() with ES6 importUsing
require()in TypeScript/ES6 code is not recommended. Consider converting to an ES6 import statement.-const IncrementalDOM = require("incremental-dom"); +import * as IncrementalDOM from "incremental-dom";
30-31: Improve type safety in highlight functionInstead of using
any, consider creating a proper type for the refractor highlight result.-refractor.highlight(code, lang) as any +refractor.highlight(code, lang) as RootAdd this type import at the top:
import type { Root } from 'hast';
23-41: Consider adding comprehensive test coverageThe new markdown-it with incremental DOM implementation is a significant change that warrants thorough testing.
Consider adding the following types of tests:
- Unit tests for markdown rendering with different content types
- Integration tests for the incremental update behavior
- Performance tests comparing with the previous implementation
- Edge case tests for very large documents and concurrent updates
Would you like me to help create a testing strategy document or generate test templates?
Also applies to: 70-78
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frontend/src/components/editor/Preview.tsx(2 hunks)
🔇 Additional comments (2)
frontend/src/components/editor/Preview.tsx (2)
Line range hint 43-67: LGTM! Clean implementation with proper cleanup
The component structure follows React best practices with proper state management and cleanup in the useEffect hook.
70-78: Verify performance improvements with incremental DOM
While the implementation looks correct, we should verify that it actually improves performance for large documents as intended.
Consider adding performance benchmarks to measure:
- Time to first render for large documents
- Update latency during collaborative editing
- Memory usage comparison with the previous implementation
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Actionable comments posted: 0
🧹 Outside diff range and nitpick comments (4)
frontend/src/components/editor/Preview.tsx (3)
29-31: Improve type safety in highlight functionInstead of using
any, consider creating a proper type for the refractor output.type RefractorNode = { type: string; children?: RefractorNode[]; value?: string; properties?: Record<string, unknown>; };Then replace the type assertion:
-refractor.highlight(code, lang) as any +refractor.highlight(code, lang) as RefractorNode
38-40: Document incremental DOM configurationSetting
incrementalizeDefaultRules: falseneeds documentation explaining why default rules are disabled and potential implications.Add a comment explaining the configuration:
.use(markdownItIncrementalDOM, IncrementalDOM, { + // Disable default rule incrementalization to prevent conflicts with custom renderers incrementalizeDefaultRules: false, })
90-94: Consider memoizing the container elementThe div properties could be memoized to prevent unnecessary re-renders.
+const containerProps = useMemo(() => ({ + 'data-color-mode': currentTheme, + style: { paddingBottom: '2rem' }, + className: 'markdown-preview' +}), [currentTheme]); return ( <div ref={containerRef} - data-color-mode={currentTheme} - style={{ paddingBottom: "2rem" }} - className="markdown-preview" + {...containerProps} /> );frontend/package.json (1)
42-42: Consider bundle size impact.The addition of multiple markdown-related packages could significantly increase the bundle size. Consider:
- Using dynamic imports for the markdown renderer to enable code-splitting
- Analyzing the bundle size impact using tools like
webpack-bundle-analyzer- Setting up size limits with
size-limitto prevent unexpected increasesAlso applies to: 52-53, 57-60, 79-79, 87-87, 90-90
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⛔ Files ignored due to path filters (1)
pnpm-lock.yamlis excluded by!**/pnpm-lock.yaml
📒 Files selected for processing (2)
frontend/package.json(3 hunks)frontend/src/components/editor/Preview.tsx(2 hunks)
🔇 Additional comments (7)
frontend/src/components/editor/Preview.tsx (3)
Line range hint 44-97: Implementation successfully addresses performance objectives
The transition to incremental DOM updates is well-implemented with proper cleanup and error handling. The code structure is clean and maintainable. While there are some minor improvements suggested above, the core implementation is solid and aligns well with the PR objectives to improve preview performance.
71-79: Verify incremental DOM update performance
The implementation aligns with the PR objective to improve preview performance. However, we should verify that the incremental updates are working as expected.
#!/bin/bash
# Search for performance tests
rg -l "Preview.*performance|performance.*Preview" --type=test
# Check for any existing benchmarks
rg -l "benchmark.*Preview|Preview.*benchmark" --type=testConsider adding performance benchmarks to validate the improvements, especially for large documents.
10-10: Consider package stability implications
Using @vscode/markdown-it-katex instead of the original markdown-it-katex package. While this might be more stable, be aware that it could have version synchronization challenges with VSCode updates.
frontend/package.json (4)
57-58: LGTM: Core packages align with incremental DOM implementation goal.
The addition of markdown-it and incremental-dom packages provides the foundation needed for implementing incremental DOM updates, which should significantly improve performance for large document editing scenarios.
Also applies to: 53-53
87-87: LGTM: Type definitions are properly aligned.
The added TypeScript definitions match their package versions and are from the reliable DefinitelyTyped repository.
Also applies to: 90-90
42-42: Verify dependency compatibility.
Please verify that all new packages are compatible with the existing React version (^17.0.0 || ^18.0.0) and check for any conflicting peer dependencies.
Let's check for potential conflicts:
#!/bin/bash
# Description: Check for peer dependency conflicts in new packages
echo "Checking peer dependencies for new packages..."
for pkg in "@vscode/markdown-it-katex" "markdown-it" "markdown-it-incremental-dom" "markdown-it-prism" "markdown-it-sanitizer" "incremental-dom"; do
echo "Package: $pkg"
npm info $pkg peerDependencies
doneAlso applies to: 52-53, 57-60, 79-79
42-42:
Security: Consider alternatives to markdown-it-sanitizer.
While the markdown-it plugins generally look good, markdown-it-sanitizer (v0.4.3) hasn't been updated in 5 years. Consider using DOMPurify or a more actively maintained sanitizer.
Let's check the last commit date and open issues:
Also applies to: 59-60
devleejb
changed the title
What this PR does / why we need it:
Apply incremental DOM update to re-render only the DOM of the parts that have changed, rather than re-rendering all.
Which issue(s) this PR fixes:
Fixes #393
Special notes for your reviewer:
This PR only cares about the performance of DOM updates in markdown rendering process. I think incremental parsing is a more complicated problem, so it would be nice to have a separate discussion on that later.
Does this PR introduce a user-facing change?:
Additional documentation:
Checklist:
Summary by CodeRabbit
New Features
Bug Fixes
Style