import * as cp from 'child_process';
import * as rpc from 'vscode-jsonrpc';

let childProcess = cp.spawn(...);

// Use stdin and stdout for communication:
let connection = rpc.createMessageConnection(
    new rpc.StreamMessageReader(childProcess.stdout),
    new rpc.StreamMessageWriter(childProcess.stdin));

let notification = new NotificationType<string, void>('testNotification');

connection.listen();

connection.sendNotification(notification, 'Hello World');

import * as rpc from 'vscode-jsonrpc';


let connection = rpc.createMessageConnection(
    new rpc.StreamMessageReader(process.stdin),
    new rpc.StreamMessageWriter(process.stdout));

let notification = new NotificationType<string, void>('testNotification');
connection.onNotification(notification, (param: string) => {
    console.log(param); // This prints Hello World
});

connection.listen();