`javascript
import { EventEmitter } from "events";
import {
RequestManager,
EventEmitterTransport,
Client,
} from "@open-rpc/client-js";

const chan1 = "chan1";
const chan2 = "chan2";

const emitter = new EventEmitter();
const transport = new EventEmitterTransport(emitter, chan1, chan2);
const requestManager = new RequestManager([transport]);
const client = new Client(requestManager);

// event emitter server code
emitter.on(chan1, (jsonrpcRequest) => {
const res = {
jsonrpc: "2.0",
result: "potato",
id: jsonrpcRequest.id,
};
emitter.emit(chan2, JSON.stringify(res));
});

const main = async () => {
const result = await client.request({ method: "addition", params: [2, 2] });
console.log(result);
};

main().then(() => {
console.log("DONE");
});
`

`javascript
import { RequestManager, Client, HTTPTransport } from "@open-rpc/client-js";

const transport = new HTTPTransport("http://localhost:3333");
const requestManager = new RequestManager([transport]);
const client = new Client(requestManager);

const main = async () => {
const result = await client.request({ method: "addition", params: [2, 2] });
console.log(result);
};

main().then(() => {
console.log("DONE");
});
`

`javascript
import {
RequestManager,
Client,
WebSocketTransport,
} from "@open-rpc/client-js";

const transport = new WebSocketTransport("ws://localhost:3333");
const requestManager = new RequestManager([transport]);
const client = new Client(requestManager);

const main = async () => {
const result = await client.request({ method: "addition", params: [2, 2] });
console.log(result);
};

main().then(() => {
console.log("DONE");
client.close();
});
`