⚡ Bolt: Optimize BackToTop scroll listener#40
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…Frame - Replaces synchronous scroll handler with requestAnimationFrame throttle. - Adds `passive: true` to scroll event listener for improved scrolling performance. - Adds unit tests for `BackToTop` component covering visibility logic and scroll-to-top behavior. - Updates package-lock.json to align with package.json dependencies. Co-authored-by: anyulled <100741+anyulled@users.noreply.github.com>
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Summary of ChangesHello @anyulled, 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 enhances the user experience by optimizing the Highlights
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Code Review
This pull request introduces a great performance optimization to the BackToTop component by throttling the scroll listener using requestAnimationFrame and adding a passive event listener. The addition of tests is also a valuable improvement. I have a few suggestions regarding type safety and test practices to further enhance the code quality.
| if (targetElement) { | ||
| window.scrollTo({ | ||
| top: (targetElement as HTMLElement).offsetTop, | ||
| behavior: "smooth", | ||
| }); |
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Using a type assertion with as HTMLElement works, but it's not the safest approach as it bypasses some type checking. A safer alternative is to use an instanceof check to ensure targetElement is indeed an HTMLElement before accessing its offsetTop property. This makes the code more robust.
| if (targetElement) { | |
| window.scrollTo({ | |
| top: (targetElement as HTMLElement).offsetTop, | |
| behavior: "smooth", | |
| }); | |
| if (targetElement instanceof HTMLElement) { | |
| window.scrollTo({ | |
| top: targetElement.offsetTop, | |
| behavior: "smooth", | |
| }); |
| expect(container.querySelector(".paginacontainer")).not.toBeInTheDocument(); | ||
| }); | ||
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| it("should scroll to top when clicked", () => { |
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This test suite is very thorough! To make it even more robust, consider adding a test case for the scenario where an invalid target selector is provided. This would ensure the fallback behavior (scrolling to the top) is explicitly tested.
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| it("should scroll to top when clicked", () => { | ||
| // Mock the target element | ||
| document.body.innerHTML = '<div id="top"></div>'; |
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Modifying document.body.innerHTML directly can lead to side effects between tests. For better test isolation, consider cleaning up the DOM after this test. A good way to do this is by adding an afterEach hook within your describe block to reset document.body.innerHTML.
…Frame - Replaces synchronous scroll handler with requestAnimationFrame throttle. - Adds `passive: true` to scroll event listener for improved scrolling performance. - Adds unit tests for `BackToTop` component covering visibility logic and scroll-to-top behavior. Co-authored-by: anyulled <100741+anyulled@users.noreply.github.com>
- Downgrades `eslint` from `^10.0.0` to `^9.17.0` in `package.json` to resolve incompatibility with `eslint-plugin-react` (via `eslint-config-next`) which was causing `TypeError: contextOrFilename.getFilename is not a function` in CI lint checks. - Updates `package-lock.json` to reflect the dependency change. - Includes previous optimization for `BackToTop` component (throttled scroll listener). Co-authored-by: anyulled <100741+anyulled@users.noreply.github.com>
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Closing as duplicate of #118. |
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💡 What: Optimized the
BackToTopcomponent by throttling the scroll event listener usingrequestAnimationFrameand adding{ passive: true }.🎯 Why: The scroll event fires frequently on the main thread. Throttling reduces the frequency of checks, and passive listeners allow the browser to optimize scrolling behavior, especially on mobile devices.
📊 Impact: Reduced main thread overhead during scrolling.
🔬 Measurement: Added
__tests__/components/elements/BackToTop.test.tsxwhich verifies the component logic remains correct (appears after 100px, scrolls to top on click). Validated withnpm test.PR created automatically by Jules for task 8596607948951691347 started by @anyulled