This D3 v5 zoomable sunburst visualizes the hierarchical structure of the Flare codebase, showing class relationships and their relative sizes. Users click arcs to zoom in and out, with an animated transition of 750ms duration. The visualization uses `d3.hierarchy`, `d3.partition`, and `d3.arc` to compute the layout, with color encoding applied via `d3.scaleOrdinal` and `d3.interpolateRainbow`. Rendering is done through SVG paths and text elements, with transitions managed by `transition.attrTween` and `d3.interpolate` for smooth angular and radial adjustments.