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GitHub engineering shares how they optimized the React-based Files changed tab in pull requests to handle large diffs with millions of lines.
•In v1, a single diff line required 10-15 DOM elements, 8-13 React components, and 20+ event handlers, causing JavaScript heap usage to exceed 1 GB and DOM node counts to surpass 400,000 on large PRs.
•v2 reduced components per diff line from 8 to 2 by eliminating thin wrapper components and giving Split and Unified views their own dedicated components.
•Event handling was consolidated into a single top-level handler using data-attributes, replacing per-line event handler attachment.
•State for comments and context menus was moved into conditionally rendered child components, reducing unnecessary state on lines that never receive comments.
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O(n) data lookups were replaced with JavaScript Map-based O(1) lookups, and useEffect hooks were restricted to top-level diff files with linting rules enforced.
•Results on a 10,000-line split diff: comp
This summary was automatically generated by AI based on the original article and may not be fully accurate.
GitHub
CSS-Tricks
WebKit