Vscode

Building a Language Server Protocol Extension from Scratch

The Language Server Protocol (LSP) lets you write language smarts once and use them in every editor. You build one server that handles autocomplete, diagnostics, hover docs, and go-to-definition. Then you plug it into VS Code, Neovim, Helix, Emacs, or anything else that speaks LSP. This walkthrough shows how to build an LSP server in TypeScript for a custom .config file format, from setup through multi-editor support.

What the Language Server Protocol Actually Is

Before LSP, editor support for a language meant writing a separate plugin for every editor. Want Python support? Write a VS Code extension, an Emacs mode, a Vim plugin, a Sublime plugin. Each one redoes parsing, diagnostics, and completion from scratch. With N editors and M languages, that’s N*M plugins to maintain.

Cursor vs. VS Code Copilot: Best AI Coding Editor 2026

Cursor wins for most coders in 2026. If you write code daily and you’re not using it, you’re leaving real speed on the table. GitHub Copilot in VS Code still wins in specific cases. What decides it isn’t the model. It’s how deep the tool reads your code, and the agent loop around it.

What “Agentic” Means in 2026

“Agentic” gets slapped on every AI coding tool with a chat box, so it helps to be precise. The capability ladder runs from tab completion at the bottom, to inline chat for single-block edits, to multi-file edit suggestions, and at the top, a real agent loop. That top loop reads your project index, edits across ten or twenty files, runs your linter and tests, reads the errors, fixes them, and keeps going until everything is green. That top tier is where Cursor and Copilot diverge most.