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This interactive tree diagram visualizes the hierarchical structure of the flare codebase, with each node representing a class or category and its size indicating relative importance. Users can expand and collapse branches, zoom and pan the view, and rearrange nodes by dragging them to new positions within the hierarchy. The visualization is built with D3.js version 3, using the tree layout, SVG rendering, and a custom drag-and-drop implementation that temporarily removes and reattaches nodes. Data comes from the bundled flare.json file, and the interface supports smooth animated transitions between states.