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Rule priority, scope & exceptions

Use this to align rules with the senior-level structure (P0/P1/P2, scope, exceptions/tradeoffs).

PriorityP1 — maintainability, architecture, long-term qualityScopeUniversal — language-agnostic, broadly applicable

Exceptions / tradeoffs (EN)Iznimke / tradeoffi (HR)

frontend ruleP1universalStack: javascript

defensive-codingguardsbugs

Place dependent side effects inside their existence/crash guard

Code that depends on a global or object being present must sit inside the guard that checks for it, otherwise the crash-prevention check is bypassed. Split into separate conditions when one guard can't cover both concerns.

PR: frontpage-web · org-mining-hist-2026-06Created: Jun 18, 2026

Bad example

Old codetypescript

1	`const user = window.tp.pianoId.getUser(); // runs even when window/tp is undefined`
2	`if (window) { ... }`

Explanation (EN)

Objašnjenje (HR)

Good example

New codetypescript

1	`if (window?.tp?.pianoId) {`
2	`const user = window.tp.pianoId.getUser();`
3	`...`
4	`}`

Explanation (EN)

Objašnjenje (HR)

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