Rules Hub
Coding Rules Library
← Back to all rules
Rule priority, scope & exceptions
Use this to align rules with the senior-level structure (P0/P1/P2, scope, exceptions/tradeoffs).
frontend ruleP2universalStack: React
performancefetchreactconditional
Only fetch data when the feature that needs it is shown
Don't eagerly fetch supporting data (e.g. categories) on mount if it's only used by an optional tab/view; guard the fetch behind the condition.
PR: hegnar-components · org-mining-hist-2026-06Created: Jun 18, 2026
Bad example
Old codetypescript
| 1 | useEffect(() => { |
| 2 | fetchNews(); |
| 3 | fetchCategories(); // fetched even when categories tab is never visible |
| 4 | }, [...]); |
Explanation (EN)
Objašnjenje (HR)
Good example
New codetypescript
| 1 | useEffect(() => { |
| 2 | fetchNews(); |
| 3 | if (showCategoriesTab) fetchCategories(); |
| 4 | }, [...]); |
Explanation (EN)
Objašnjenje (HR)