DataGrid: fix ts issues in demos in strict mode

[anna-shakhova]

No description provided.

[Copilot]

Pull request overview

This pull request enables TypeScript strict mode for React demos and addresses TypeScript compilation errors across DataGrid, TreeList, and CardView components. The configuration now uses an include-all with exclusions approach rather than explicitly listing files, making it easier to maintain as new demos are added.

Key changes:

• Enabled strict: true in tsconfig.react-check.json for comprehensive type checking
• Added proper type annotations for state variables, function parameters, and refs
• Implemented null-safety checks using optional chaining and null coalescing operators
• Reorganized imports to separate type imports from value imports

Reviewed changes

Copilot reviewed 78 out of 78 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
apps/demos/tsconfig.react-check.json	Enabled strict mode and switched to include-all/exclude pattern for maintainability
apps/demos/Demos/TreeList/WebAPIService/React(Js)/App.(tsx|js)	Added type import separation and unused parameter handling
apps/demos/Demos/TreeList/LocalReordering/React(Js)/App.(tsx|js)	Added boolean coercion for checkbox-controlled properties
apps/demos/Demos/TreeList/CustomizeKeyboardNavigation/React(Js)/App.(tsx|js)	Added boolean coercion for editOnKeyPress property
apps/demos/Demos/TreeList/ColumnChooser/React(Js)/App.(tsx|js)	Added boolean coercion and formatting fixes
apps/demos/Demos/DataGrid/WebAPIService/React/MasterDetailGrid.tsx	Added proper type annotation for dataSource state
apps/demos/Demos/DataGrid/Toolbar/React(Js)/App.(tsx|js)	Added optional chaining for dataGrid ref access
apps/demos/Demos/DataGrid/StatePersistence/React(Js)/App.(tsx|js)	Added optional chaining for dataGrid ref access
apps/demos/Demos/DataGrid/SignalRService/React(Js)/App.(tsx|js)	Added type annotation and import reorganization
apps/demos/Demos/DataGrid/RowEditing/React/App.tsx	Added type annotation for events array state
apps/demos/Demos/DataGrid/Row/React/DataRow.tsx	Cleaned up import formatting
apps/demos/Demos/DataGrid/RemoteReordering/React/App.tsx	Added event handler types and type casting for onReorder
apps/demos/Demos/DataGrid/RemoteCRUDOperations/React/App.tsx	Added type annotation for requests array state
apps/demos/Demos/DataGrid/PDFHeaderAndFooter/React(Js)/App.(tsx|js)	Added null checks for rect object
apps/demos/Demos/DataGrid/PDFExportMultipleGrids/React(Js)/App.(tsx|js)	Added null checks and optional chaining for grid refs and cells
apps/demos/Demos/DataGrid/PDFExportImages/React(Js)/App.(tsx|js)	Added comprehensive null checks for export callbacks
apps/demos/Demos/DataGrid/PDFCellCustomization/React(Js)/App.(tsx|js)	Added null checks and optional property access
apps/demos/Demos/DataGrid/NewRecordPosition/React(Js)/App.(tsx|js)	Added type annotations and required data property
apps/demos/Demos/DataGrid/MultipleSorting/React(Js)/App.(tsx|js)	Added optional chaining for dataGrid ref
apps/demos/Demos/DataGrid/MultipleRecordSelectionAPI/React(Js)/App.(tsx|js)	Added type annotations and optional chaining
apps/demos/Demos/DataGrid/HorizontalVirtualScrolling/React/data.ts	Improved type definitions for generated data
apps/demos/Demos/DataGrid/FocusedRow/React/App.tsx	Added type annotation for focusedRowKey state
apps/demos/Demos/DataGrid/FilteringAPI/React(Js)/App.(tsx|js)	Added optional chaining for dataGrid operations
apps/demos/Demos/DataGrid/Filtering/React(Js)/App.(tsx|js)	Added comprehensive types and null checks for filter expressions
apps/demos/Demos/DataGrid/FilterPanel/React/data.ts	Added detailed type definitions for order data
apps/demos/Demos/DataGrid/ExcelJSHeaderAndFooter/React(Js)/App.(tsx|js)	Added null-safe property access for cell ranges
apps/demos/Demos/DataGrid/ExcelJSExportMultipleGrids/React(Js)/App.(tsx|js)	Added null checks and optional chaining for export operations
apps/demos/Demos/DataGrid/ExcelJSExportImages/React(Js)/App.(tsx|js)	Added null checks for grid cells and columns
apps/demos/Demos/DataGrid/ExcelJSCellCustomization/React(Js)/App.(tsx|js)	Added comprehensive null checks for cell customization
apps/demos/Demos/DataGrid/DeferredSelection/React(Js)/App.(tsx|js)	Added null coalescing for async data fetching
apps/demos/Demos/DataGrid/CustomEditors/React(Js)/App.(tsx|js)	Fixed lookup dataSource handling and added null checks
apps/demos/Demos/DataGrid/CustomDataSource/React/App.tsx	Separated type imports from value imports
apps/demos/Demos/DataGrid/CommandColumnConfiguration/React(Js)/App.(tsx|js)	Added proper types for button render options and improved null safety
apps/demos/Demos/DataGrid/CellEditing/React/App.tsx	Added type annotation for selection state
apps/demos/Demos/DataGrid/Cell/React(Js)/DiffCell.(tsx|js)	Added null-safe property access for column caption
apps/demos/Demos/DataGrid/CascadingLookups/React(Js)/App.(tsx|js)	Fixed defaultSetCellValue call and added null checks
apps/demos/Demos/DataGrid/AdvancedMasterDetailView/React/*.tsx	Added type annotations for store states
apps/demos/Demos/DataGrid/AIColumns/React(Js)/.	Added null coalescing for AI responses and null-safe property access
apps/demos/Demos/CardView/Selection/React(Js)/App.(tsx|js)	Added boolean coercion for allowSelectAll property
apps/demos/Demos/CardView/ColumnChooser/React(Js)/App.(tsx|js)	Added boolean coercion for multiple checkbox properties