LSP Text Document Implementation

The `vscode-languageserver-textdocument` package provides a lightweight and immutable in-memory representation of a text document, specifically designed for use within Node.js-based Language Server Protocol (LSP) servers. It abstracts away the complexities of file system interactions, offering a consistent model for document content, versioning, and change tracking. This is a foundational utility within the larger `vscode-languageserver-node` monorepo, which is actively maintained by Microsoft. While the monorepo sees frequent `next` releases (e.g., `10.0.0-next.x` for server components), `vscode-languageserver-textdocument` itself is currently stable at version `1.0.12`, indicating a mature and less frequently changing API for its core document management functions. It is written in TypeScript and ships with comprehensive type definitions, making it well-suited for TypeScript-first development environments. Its primary differentiator is its focus on being a simple, efficient, and reliable document model optimized for LSP server operations like diagnostics, completions, and refactoring.