TypeScript Language Server in clickhouse-js

typescript-language-server is declared as a root devDependency, so after npm install (see the setup skill) it is available via npx and uses the workspace-local typescript (6.x) compiler, matching CI exactly.

The server (6.x) requires Node.js >= 22.22.2, newer than the repository's Node 20 minimum; on Node 20 npm install only warns, but the server isn't supported there.

Starting the server

From the repo root:

npx typescript-language-server --stdio

It speaks LSP (JSON-RPC, Content-Length-framed) over stdio. There is no extra configuration: each packages/* workspace, tests/clickhouse-test-runner, examples/node, and examples/web has its own tsconfig.json, and the server picks the nearest one per opened file automatically.

Protocol essentials

1. Send initialize with rootUri/workspaceFolders pointing at the repo root, then the initialized notification.
2. Send textDocument/didOpen with the full file text for every file you want to query (the server reads dependencies from disk on its own; only files you query positions in need to be opened).
3. Positions are 0-based (line and character).

Verified capabilities (typescript-language-server 5.x, TS 6.x)

Tips

• If your environment provides built-in LSP/code-intelligence tooling, point it at npx typescript-language-server --stdio with the repo root as the workspace folder.
• For one-off scripted queries, spawn the server from Node, frame messages with Content-Length: <bytes>\r\n\r\n<json>, and match responses by id.
• A full workspace typecheck is still npm run build && npm run typecheck (build first — some workspaces import compiled dist/ outputs); the LSP is for targeted, interactive queries, not for CI-equivalent validation.