Primer Octicons is a monorepo containing GitHub's official SVG icon set and its idiomatic packages for Node.js (JavaScript), React (with styled-system variants), and Ruby (gem, Rails helper, Jekyll plugin). The core build pipeline (`script/build.ts`) ingests raw SVG files from the `icons/` directory, validates their structure (filename, width/height, viewBox), parses them into an AST via svgson, and produces a consolidated `data.json` along with optimized SVG copies. A metadata layer (`script/icon-metadata.ts`) handles icon naming and backward compatibility: it supports aliases (e.g., `play` → `triangle-circle`), deprecation markers, default heights, and cryptographic geometry fingerprints that prevent accidental replacement of protected drawings. Each platform package is then generated from this shared data. The React package (`@primer/octicons-react`) uses a sophisticated build script that emits per-icon modules as pre-compiled `React.forwardRef` components, enabling tree-shaking and dynamic imports without runtime factory calls. The test suite is comprehensive, covering build validation, metadata integrity, React rendering, code-splitting, and Ruby library behavior. The repository exhibits excellent craftsmanship in its handling of naming stability, deprecation, and cross-platform icon delivery while maintaining a consistent design language across all packages.