svelte-language-server

import { spawn } from 'child_process'; import { resolve } from 'path'; // This quickstart demonstrates how to programmatically launch the Svelte Language Server // and send an 'initialize' request, as a basic example for building an LSP client. // In a typical setup, users interact via editor extensions (e.g., VS Code Svelte extension). const serverExecutable = resolve(__dirname, 'node_modules', 'svelte-language-server', 'bin', 'server.js'); // Spawn the language server process const lsProcess = spawn('node', [serverExecutable], { stdio: ['pipe', 'pipe', 'pipe'] // stdin, stdout, stderr pipes }); let requestId = 1; function sendLSPRequest(method: string, params: any) { const request = { jsonrpc: '2.0', id: requestId++, method, params }; const jsonRequest = JSON.stringify(request); const contentLength = Buffer.byteLength(jsonRequest, 'utf8'); const header = `Content-Length: ${contentLength}\r\n\r\n`; // Simplified header lsProcess.stdin.write(header + jsonRequest); } // Listen for responses (simplified, real clients handle streaming and headers) lsProcess.stdout.on('data', (data) => { console.log('Language Server Output:', data.toString().trim()); }); lsProcess.stderr.on('data', (data) => { console.error('Language Server Error:', data.toString().trim()); }); lsProcess.on('close', (code) => { console.log(`Language Server process exited with code ${code}`); }); // Send the initial 'initialize' request, crucial for LSP setup sendLSPRequest('initialize', { processId: process.pid, clientInfo: { name: 'Svelte LS Quickstart', version: '1.0' }, rootUri: 'file:///home/user/my-svelte-project', // Replace with actual project root capabilities: {}, // Define client capabilities as per LSP spec initializationOptions: { // Pass initial configuration configuration: { svelte: { plugin: { typescript: { enable: true }, html: { enable: true } }, // Other Svelte language server specific settings }, typescript: { /* TypeScript specific settings */ }, javascript: { /* JavaScript specific settings */ }, } } }); // In a real application, you would continue to send requests (e.g., didOpen, textDocument/hover) // and handle responses. For this quickstart, we'll just demonstrate initialization. // Ensure to properly manage the lifecycle of the child process. process.on('exit', () => lsProcess.kill()); // Clean up on parent exit