How to use the monaco-languageclient.createConnection function in monaco-languageclient

get: (errorHandler, closeHandler) => {
        return Promise.resolve(createConnection(connection, errorHandler, closeHandler));
      },
    },

get: function (errorHandler, closeHandler) {
                var connection = monaco_languageclient_1.createConnection(messageConnection, errorHandler, closeHandler);
                diagramServer.listen(connection);
                return Promise.resolve(connection);
            }
        }

get: (errorHandler, closeHandler) => {
                return Promise.resolve(createConnection(connection, errorHandler, closeHandler))
            }
        }

get: (errorHandler, closeHandler) =>
        Promise.resolve(createConnection(connection, errorHandler, closeHandler))
    }

get: (errorHandler, closeHandler) => {
                const connection = createConnection(messageConnection, errorHandler, closeHandler)
                diagramServer.listen(connection)
                return Promise.resolve(connection)
            }
        }

get: (errorHandler, closeHandler) => {
                            return Promise.resolve(createConnection(connection, errorHandler, closeHandler));
                        },
                    },

get: (errorHandler, closeHandler) => {
        return Promise.resolve(createConnection(messageConnection, errorHandler, closeHandler))
      }
    }

get: (errorHandler, closeHandler) => {
                return Promise.resolve(createClientConnection(connection, errorHandler, closeHandler));
            },
        },

get: (errorHandler, closeHandler) =>
        Promise.resolve(createConnection(connection, errorHandler, closeHandler)),
    },

get: (errorHandler, closeHandler) => {
        return Promise.resolve(createConnection(connection, errorHandler, closeHandler));
      },
    },