Unified Language Server

unified-language-server provides a framework for building language servers based on the unified ecosystem. It allows developers to create editor integrations that format and validate documents using existing unified processors like remark (for Markdown) or rehype (for HTML). The current stable version is 4.0.1, with minor releases typically focusing on dependency updates and bug fixes, and major versions introducing breaking changes such as Node.js version requirements or significant internal refactors (e.g., using `unist-util-lsp`). Key differentiators include its tight integration with `unified-engine` for configuration file support (like `.remarkrc`) and its ability to work with any unified processor, simplifying the creation of LSP-compliant tools for AST transformations. It supports features like document formatting, validation, and quick fixes.