lerna

Lerna is an open-source command-line tool used to manage JavaScript projects that consist of multiple packages in a single repository, a setup known as a monorepo.

Core features include bootstrapping dependencies and linking local packages, running scripts across packages, and generating and publishing new releases.

Lerna supports two versioning modes: fixed mode, which assigns a single version to all packages; and independent mode, in which each package can be versioned separately.

Dependency management: Lerna can hoist common dependencies to the repository root, reducing duplication and installation time.

Usage and ecosystem: It is commonly used with npm and Yarn-based workflows and integrates with major package managers and CI systems. It aims to improve maintainability and release coordination for multi-package JavaScript projects.