React performance

React JSX performance rules from eslint-plugin-react-perf. Detects freshly-allocated reference values (arrays, objects, functions, JSX elements) passed as JSX props. A new reference invalidates React.memo / useMemo shallow checks on every render. Useful for performance-critical render paths; usually unnecessary for top-level pages. Diagnostics only fire on .tsx source files, JSX heuristics rely on the file extension, so .ts files are skipped even when they contain JSX-like syntax. Each rule accepts nativeAllowList?: "all" | string[] to skip lowercase/native JSX elements globally or by prop name while still checking custom components.

Source: eslint-plugin-react-perf (MIT).

• react-perf/jsx-no-new-array-as-prop: Reject array literals ([...]) passed inline as a JSX prop.
• react-perf/jsx-no-new-function-as-prop: Reject inline function expressions / arrow functions passed as a JSX prop.
• react-perf/jsx-no-new-object-as-prop: Reject inline object literals ({...}) passed as a JSX prop.
• react-perf/jsx-no-jsx-as-prop: Reject JSX expressions and fragments passed as a JSX prop. Each evaluation creates a new React element.