fix: memoize examples to prevent repeated re-renders when typing in …

[keval718]

Problem
When the Template modal was opened, everything loaded correctly initially. However, typing in the search field caused continuous re-renders, leading to performance issues and unexpected repeated rendering of the template cards.

Root Cause
The examples array was being recreated on every render because it was defined using .filter() directly inside the component body.
As a result, the useMemo that initializes the Fuse instance (new Fuse(examples, ...)) was being re-triggered each time since examples received a new array reference.
This caused the useEffect that depends on fuse and examples to run repeatedly, updating state on each render and creating an infinite re-render cycle.

Fix Implemented

• Wrapped the examples filtering logic inside a useMemo to ensure that the array reference remains stable between renders.
• The memoized examples value now only changes when allExamples or currentTab are updated.
• This prevents unnecessary recreation of the Fuse instance and stops the repeated state updates.

Result

• Prevented unnecessary re-renders when typing in the search field.
• Improved performance and responsiveness of the Template modal.
• Search results now update smoothly and efficiently without triggering repeated renders.

Summary by CodeRabbit

• Refactor
  • Improved performance of template examples filtering to reduce unnecessary recomputations during component rendering.

[coderabbitai]

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Walkthrough

The change wraps the computation of filtered examples in useMemo with dependencies on allExamples and currentTab. The filtering logic remains unchanged; only the evaluation timing is optimized to defer computation until dependencies update.

Changes

Cohort / File(s)	Summary
Performance Optimization src/frontend/src/modals/templatesModal/components/TemplateContentComponent/index.tsx	Wraps example filtering logic in useMemo with dependencies on allExamples and currentTab to prevent unnecessary recomputations on each render.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Verify that allExamples and currentTab are the correct and complete set of dependencies for the memoized computation
• Confirm the memoization doesn't introduce stale closure issues or unintended side effects with the filtering logic

Pre-merge checks and finishing touches

❌ Failed checks (3 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.
Test Quality And Coverage	⚠️ Warning	No tests were added or modified to validate the memoization fix for the performance optimization.	Add unit tests covering the filtering behavior, memoization dependency tracking, and prevention of infinite re-render cycles caused by unstable array references.
Test File Naming And Structure	⚠️ Warning	The PR modifies TemplateContentComponent to add useMemo but includes no test file following the *.test.tsx pattern required for component testing.	Add index.test.tsx to verify memoization works correctly and prevents unnecessary re-renders when search input changes.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main fix: memoizing examples to prevent re-renders during search/typing.
Excessive Mock Usage Warning	✅ Passed	No test files exist in this PR that could contain mock usage patterns, as the changes are limited to a performance optimization in the component source code.

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	14.66% (3955/26977)	7.45% (1533/20560)	8.99% (532/5914)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
1588	0 💤	0 ❌	0 🔥	18.188s ⏱️

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 31.40%. Comparing base (91d73e7) to head (4a651ec).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...odal/components/TemplateContentComponent/index.tsx	0.00%	6 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (40.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project status has failed because the head coverage (39.35%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10554      +/-   ##
==========================================
- Coverage   31.47%   31.40%   -0.08%     
==========================================
  Files        1328     1327       -1     
  Lines       60091    60027      -64     
  Branches     8986     8986              
==========================================
- Hits        18912    18849      -63     
  Misses      40272    40272              
+ Partials      907      906       -1     

Flag	Coverage Δ
frontend	13.55% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...odal/components/TemplateContentComponent/index.tsx	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[Adam-Aghili]

LGTM! thank you @keval718

Screen.Recording.2025-11-10.at.4.55.34.PM.mov

[deon-sanchez]

Great Work @keval718