react-best-practices

Provides React patterns for hooks, effects, refs, and component design. Covers escape hatches, anti-patterns, and correct effect usage. Must use when reading or writing React components (.tsx, .jsx files with React imports).

1.07x

Quality

91%

Does it follow best practices?

Impact

96%

1.07x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Evaluation results

100%

15%

Refactor a Buggy Task Management Component

Effect anti-patterns avoidance

Criteria

Without context

With context

No derived state Effect

100%

useMemo for expensive calc

100%

No event logic in Effect

100%

No parent notification Effect

100%

No Effect chains

100%

No linter suppression

100%

Updater function usage

100%

key prop for state reset

100%

Derived value in render

100%

Effects used for external sync only

50%

100%

Without context: $0.3570 · 1m 29s · 18 turns · 25 in / 5,467 out tokens

With context: $0.5066 · 1m 43s · 23 turns · 280 in / 5,212 out tokens

88%

Build a Real-Time Chat Room Component

Effect dependencies and cleanup

Criteria

Without context

With context

Options object inside Effect

80%

useEffectEvent for theme/config

50%

useEffectEvent for callback prop

20%

100%

Connection cleanup

100%

Event listener cleanup

100%

Ignore flag for fetch

90%

100%

No didInit ref guard

100%

No linter suppression

100%

Updater function in Effect

100%

Minimal dependency arrays

100%

Without context: $0.3779 · 1m 54s · 17 turns · 24 in / 6,755 out tokens

With context: $0.6197 · 2m 58s · 20 turns · 25 in / 10,014 out tokens

100%

Build an Interactive Ingredient Checklist with Smart Focus

Refs and custom hooks patterns

Criteria

Without context

With context

Ref for non-render value

100%

No ref.current in render

100%

Ref callback with Map

100%

useImperativeHandle used

100%

Limited API exposed

100%

No useXxx without hooks

100%

No lifecycle hook abstractions

100%

Focused custom hooks

100%

Scroll in event handler

100%

Ref cleanup in callback

100%

Composition over prop drilling

100%

Without context: $0.4421 · 2m 6s · 23 turns · 29 in / 7,388 out tokens

With context: $1.3850 · 6m 47s · 42 turns · 79 in / 20,631 out tokens

Repository: freekmurze/dotfiles
Commit: 355d067

Evaluated: 13 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Refactor a Buggy Task Management Component Build a Real-Time Chat Room Component Build an Interactive Ingredient Checklist with Smart Focus

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