Package textdocument is a slim wrapper around lsp.TextDocumentItem that contains useful methods such as PositionAt See: https://github.com/microsoft/vscode-languageserver-node/blob/master/textDocument/src/main.ts.

CreateInstance will instantiate a JSON-RPC server.

New instantiates a language server to be used in a JSON-RPC context.

LanguageServer contains definitions of JSON-RPC options, context, and logger to be used when instantiating a new language server.