What applies here

All packages use Vitest as the testing framework and collect coverage using @vitest/coverage-v8.

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Code quality is automatically enforced through ESLint configured for TypeScript, Prettier for formatting, and lint-staged running these tools on staged files via husky.

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Every geometric type in this library provides multiple static factory functions for construction from different coordinate representations (e.g., from angles, degrees, vertices, or identifiers).

packages/s2 · layering

Internal packages are prefixed with @s2js and are listed as regular dependencies of the packages that consume them.

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Root devDependencies contain monorepo orchestration (Nx, Changesets) and code quality tools (ESLint, Prettier, Husky, lint-staged), while individual package devDependencies contain build (tsup, TypeScript) and test (Vitest) tools.

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Root package.json owns devDependencies for shared tooling (linting, formatting, versioning, CI tools); individual package.json files own devDependencies for package-specific build and test tools.

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Testing across all packages is executed via Vitest within GitHub Actions CI.

usage-convention

The monorepo is organized with core packages in the packages/ directory and example applications in the examples/ directory.

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The monorepo uses Nx for orchestration and Husky with lint-staged for pre-commit hooks to enforce code quality via ESLint and Prettier, all declared as root devDependencies.

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Structural duplication: packages/r2/vitest.config.ts, packages/r3/vitest.config.ts, packages/earth/vitest.config.ts, packages/s1/vitest.config.ts, packages/r1/vitest.config.ts, packages/s2/vitest.config.ts — ONE concept: vitest configuration with v8 coverage and uniform 95% thresholds | drift: no drift in shown windows; all files identical | lockstep: changing any coverage threshold, reporter, or exclude pattern…

Structural Duplication · medium