Langium Language Engineering Tool

Langium is an open-source, TypeScript-based framework designed for language engineering, offering first-class support for the Language Server Protocol (LSP). It enables developers to create Domain-Specific Languages (DSLs) and low-code platforms with deep integration into environments like VS Code and Eclipse Theia. The current stable version is 4.2.2, with frequent minor releases occurring roughly monthly or bi-monthly, and major versions typically released annually. Key differentiators include its declarative grammar language (similar to Xtext but relying on TypeScript interfaces instead of EMF), a robust dependency injection system for extensibility, high performance powered by Chevrotain, and the ability to generate typed Abstract Syntax Trees (ASTs). Langium supports execution in both Node.js environments and web browsers, making it versatile for various language tooling needs.