DefinitelyTyped/types/sockjs-client/sockjs-client-tests.ts

import SockJS = require('sockjs-client');

let sockJs: any;

sockJs = new SockJS('url');
sockJs = SockJS('url');
sockJs = SockJS('url', null, {
    server: '1233445',
    sessionId: 23,
    transports: 'websocket'
});
sockJs = SockJS('url', null, {
    sessionId: () => 'SID',
    transports: ['websocket', 'eventsource']
});

const listener = (e: any) => e;
const listenerObj = {
    handleEvent: (e: any) => e
};

sockJs.addEventListener('onopen', listener);
sockJs.addEventListener('onclose', listener, true);
sockJs.addEventListener('onopen', listenerObj);
sockJs.addEventListener('onclose', listenerObj, true);

sockJs.removeEventListener('onopen', listener);
sockJs.removeEventListener('onclose', listener, true);
sockJs.removeEventListener('onopen', listenerObj);
sockJs.removeEventListener('onclose', listenerObj, true);

sockJs.onopen = (e: any) => console.log(e);
sockJs.onmessage = (e: any) => console.log(e.data);
sockJs.onclose = (e: any) => console.log(e.code, e.reason, e.wasClean);

const num = -1 as number;
const testStates = SockJS.CONNECTING !== num && SockJS.OPEN !== num && SockJS.CLOSING !== num && SockJS.CLOSED !== num;

sockJs.send('send');
sockJs.send({x: 1});

sockJs.close(100, 'reason');
sockJs.close(200);
sockJs.close();

type MessageEvent = SockJS.MessageEvent;