Changesets is a tool designed to streamline versioning and changelog management, particularly for multi-package repositories (monorepos). It empowers contributors to declare how their changes should be released, automating the process of updating package versions, generating changelogs, and publishing new package versions based on this information. The tool focuses on ensuring that inter-dependent packages within a monorepo remain synchronized and makes it easy to apply changes across groups of packages.
The core concept is a "changeset," which represents an intent to release a set of packages at specific semver bump types, accompanied by a summary of the changes. The `@changesets/cli` package facilitates writing these changeset files, combining them into a release, handling internal dependencies, updating changelogs, and publishing all updated packages from a monorepo with a single command. It can be integrated into CI/CD pipelines for automated checks and releases, offering a robust solution for maintaining consistent and transparent release processes in complex software projects.