@yummacss/language-server

Language server for Yumma CSS. Brings completion, hover, unknown-class diagnostics, conflict detection, color decorators, and class sorting to any editor that speaks the Language Server Protocol - Zed, Neovim, Helix, Sublime Text, and more.

This is the same engine behind the VS Code extension, exposed over LSP instead of the VS Code API. Both consume @yummacss/intellisense, so features never drift between editors.

Usage

Most users will get this through an editor extension (e.g. the Zed extension) rather than running it directly. To run it manually:

npx @yummacss/language-server --stdio

The server communicates over stdio and expects the client to send a standard LSP initialize request. It looks for yumma.config.mjs in the first workspace folder and reloads it automatically on change.

Capabilities

• textDocument/completion - class name completion inside class/className attributes.
• textDocument/hover - the generated CSS declaration for the class under the cursor.
• textDocument/publishDiagnostics - warns on conflicting utilities (e.g. two classes setting the same property) and classes that are not part of the Yumma CSS canon, with "Did you mean" suggestions.
• textDocument/codeAction - quick fixes for both diagnostic kinds.
• textDocument/documentColor - color swatches for color utilities.
• textDocument/formatting - sorts classes in a document (bind to your editor's "Format Document" action).

Programmatic API

import { createConnection, ProposedFeatures } from "vscode-languageserver/node";
import { createServer } from "@yummacss/language-server";

const connection = createConnection(ProposedFeatures.all, process.stdin, process.stdout);
createServer(connection);