$ show swimlane/ngx-datatable
This is the source code for `@swimlane/ngx-datatable`, an Angular component library for building high-performance, feature-rich data tables. It provides virtual scrolling, client- and server-side sorting/paging, column reordering/resizing, row selection (single, multi, checkbox), tree view, row grouping, summary rows, and extensive custom template support. The library is built with Angular's signals-based reactivity and OnPush change detection, offering a modern reactive API. The repository also includes a comprehensive demo application and a test suite using Vitest, Angular CDK ComponentHarness, and Playwright for E2E. While the codebase demonstrates strong architectural patterns and reusable utilities, it suffers from a high number of open issues (917), some deprecated API surfaces, and a test stack in migration flux, indicating a mature but somewhat stale maintenance state.
The LLM identified 5 files worth highlighting for reuse:
Implements a Fenwick tree (Binary Indexed Tree) for O(log n) row offset computation in virtual scrolling. This is a self-contained utility that can be extracted and reused in any virtual-scroll implementation requiring efficient range sum queries and point updates. It demonstrates non-obvious data structure usage for performance optimization.
Provides algorithms for column width calculation including flex and force-fill modes. The functions compute widths based on column constraints, container size, and distribution rules. This is a self-contained math utility that can be reused in any grid or table component needing intelligent column sizing.
Contains a stable sorting algorithm with support for multi-column sorting, types (single, multi), and custom comparator functions. It uses `getterForProp` for deep property access. The sorting logic is isolated and can be reused in any client-side data grid or list component.
Handles tree data transformation: flattening nested parent-child structures into a flat array with depth and expand/collapse state, and converting back. Includes cycle detection to prevent infinite recursion. This is a reusable utility for any tree-grid or hierarchical data view.
Implements an Angular directive for drag-and-drop column reordering. It tracks drag positions, handles mouse events, and emits reorder changes. This is a self-contained directive that can be extracted and reused in other list or grid components requiring reordering via drag.