apollo-language-server

/* This quickstart demonstrates how a Language Server Protocol (LSP) client, such as an IDE extension, might theoretically invoke the apollo-language-server as a child process. Direct programmatic use of this package in a typical application is not intended or recommended, especially given its deprecated status. Users seeking Apollo GraphQL language features should install the official 'Apollo GraphQL' VS Code extension or similar editor integrations. */ import { spawn } from 'child_process'; import path from 'path'; const languageServerPath = path.resolve( __dirname, 'node_modules', 'apollo-language-server', 'lib', 'index.js' ); const languageServerProcess = spawn( 'node', [languageServerPath], { stdio: ['pipe', 'pipe', 'pipe'] } ); languageServerProcess.stdout.on('data', (data) => { console.log(`LSP Server stdout: ${data}`); // In a real LSP client, this data would be parsed as LSP messages // and used to update editor features (diagnostics, completions, etc.) }); languageServerProcess.stderr.on('data', (data) => { console.error(`LSP Server stderr: ${data}`); }); languageServerProcess.on('close', (code) => { console.log(`LSP Server process exited with code ${code}`); }); // Example: Sending an initialize request (simplified, actual LSP has headers) const initializeRequest = { jsonrpc: '2.0', id: 1, method: 'initialize', params: { processId: process.pid, rootUri: `file://${process.cwd()}`, capabilities: { /* client capabilities here */ } } }; function sendLSPMessage(message: any) { const content = JSON.stringify(message); const contentLength = Buffer.byteLength(content, 'utf8'); const header = `Content-Length: ${contentLength}\r\nContent-Type: application/json\r\n\r\n`; languageServerProcess.stdin.write(header + content); } // In a real client, you'd send more messages (didOpen, didChange, etc.) // For this quickstart, we'll just demonstrate starting and sending one message. // In a real scenario, there would be a full LSP communication loop. // To prevent the example from hanging indefinitely in a CI environment setTimeout(() => { console.log('Terminating example LSP client after some time.'); languageServerProcess.kill(); }, 5000);