Open Source Library Stack (TypeScript, Vitest, Changesets, GitHub Actions, npm) overview

A lean open source library development stack optimized for publishing high-quality TypeScript packages to npm. Vitest provides fast unit and integration testing with native TypeScript support. Changesets manages semantic versioning, changelogs, and coordinated releases across packages. GitHub Actions automates CI (lint, test, build) and CD (publish to npm on merge to main). tsup bundles ESM and CJS outputs with declaration files. Designed for individual maintainers and small teams shipping reusable libraries. The tradeoff is maintenance burden — open source libraries attract issues, PRs, and support requests that scale unpredictably, and the CI/CD pipeline must handle contributor forks with varying environment configurations.