$ show primer/octicons
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.
The LLM identified 4 files worth highlighting for reuse:
Implements `applyIconMetadata` which enriches raw icon data with alias definitions, deprecation flags, default heights, and cryptographic geometry fingerprints (SHA-256 of normalized AST). Validates configuration thoroughly, prevents duplicate aliases, and rejects icon changes that would alter protected drawings. This module is self-contained, well-typed, and could be extracted for any icon set that needs managed naming evolution and artwork protection.
Generates per-icon React modules from the central `build/data.json` using Babel AST. Each icon is emitted as a finished `React.forwardRef` component that calls a shared `renderOcticon` runtime, avoiding runtime factory calls. This enables true tree-shaking and code-splitting via subpath exports (`@primer/octicons-react/AlertIcon`). The pattern of static compilation of icon data into optimized components is portable to other icon libraries.
Provides an `OcticonSymbols` component that renders a hidden SVG sprite with deduplicated symbol definitions. Uses React context to track which symbols have already been registered, preventing redundant sprite entries when components are nested. Consumers can declaratively register symbols and render lightweight `<use>` references via `IconReference`. This pattern is reusable in any React application that uses SVG symbols for performance.
Filters a list of changed SVG file paths to exclude those that should not be optimized by SVGO (e.g., aliased heights, protected geometry). Returns only eligible files for the SVG optimization workflow. This is a focused utility that prevents automated optimizers from altering pixel-identical compatibility copies or breaking geometry fingerprints. The selection logic is generic and could be reused in any icon repository with similar preservation requirements.