vscode-extension-samples/lsp-multi-server-sample/server/src/server.ts

/* --------------------------------------------------------------------------------------------
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License. See License.txt in the project root for license information.
 * ------------------------------------------------------------------------------------------ */

import {
	createConnection, TextDocuments, ProposedFeatures, TextDocumentSyncKind
} from 'vscode-languageserver';

// Creates the LSP connection
let connection = createConnection(ProposedFeatures.all);

// Create a manager for open text documents
let documents = new TextDocuments();

// The workspace folder this server is operating on
let workspaceFolder: string | null;

documents.onDidOpen((event) => {
	connection.console.log(`[Server(${process.pid}) ${workspaceFolder}] Document opened: ${event.document.uri}`);
})
documents.listen(connection);

connection.onInitialize((params) => {
	workspaceFolder = params.rootUri;
	connection.console.log(`[Server(${process.pid}) ${workspaceFolder}] Started and initialize received`);
	return {
		capabilities: {
			textDocumentSync: {
				openClose: true,
				change: TextDocumentSyncKind.None
			}
		}
	}
});
connection.listen();