VSCode JSON RPC

This npm module implements the base messaging protocol spoken between a VSCode language server and a VSCode language client.

The npm module can also be used standalone to establish a JSON-RPC channel between a client and a server. Below an example how to setup a JSON-RPC connection. First the client side.

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');

The server side looks very symmetrical:

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();

History

3.0.0:

• converted the NPM module to use TypeScript 2.0.3.
• added strict null support.
• support for passing more than one parameter to a request or notification.
• Breaking changes:
  • due to the use of TypeScript 2.0.3 and differences in d.ts generation users of the new version need to move to TypeScript 2.0.3 as well.

License

MIT