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- Upgrade react/react-dom from ^18.2.0 to ^19.0.0 - Upgrade @types/react/@types/react-dom to ^19.0.0 - Replace react-test-renderer with @testing-library/react (17 test files) - Remove forwardRef wrappers (Input, TextArea, Modal, react-map-gl mock) - Remove propTypes assignments (Collapsible, Toggle, Dropdown, Input) - Remove Deprecated validator from utils/prop-types - Fix useRef() calls to pass explicit initial values (5 files) - Migrate emotion v10 to @emotion/css v11 in CSS pipeline - Replace Context.Provider with Context (React 19 syntax) - Replace useContext with use() hook (React 19 API) - Fix ReactElement<any> type casts for React 19 stricter typing - Fix styleguide webpack chunk filename conflict and router aliases - Remove deprecated TabNavigation page from styleguide - Regenerate all 64 test snapshots - Update peer dependency ranges to support React 19 (<21) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Move console.warn calls out of render into useEffect (Dropdown, Table, FilterGroup, Filter, TabNavigation, Grid) - Remove trivial dev warnings that don't aid debugging (Title, Pagination, NumberInput) - Fix hooks-after-early-return in Dropdown (Rules of Hooks violation) - Move ref.current sync assignments into useEffect (Modal, Popover, InlineEdit) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
React 19 is now the minimum supported version. The React 18 test job swapped in React 18 at runtime but @testing-library/react@16 requires React 19 internals, causing recentlyCreatedOwnerStacks errors. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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