[nodejs][npm] imap-simple npm package not working

[krishna408]

`var imaps = require('imap-simple');

var config = {
imap: {

    user: 'kk123@gmail.com',
    password: 'xxxxxxxxxxxxxxx',
    host: 'imap.gmail.com',
    port: 993,
    tls: true,
 //  tlsOptions: { rejectUnauthorized: false },
    authTimeout: 3000
}

};

imaps.connect(config).then(function (connection) {

return connection.openBox('INBOX').then(function () {
    var searchCriteria = [
        'UNSEEN'
    ];

    var fetchOptions = {
        bodies: ['HEADER', 'TEXT'],
        markSeen: false
    };

    return connection.search(searchCriteria, fetchOptions).then(function (results) {
        var subjects = results.map(function(res){
            return res.parts.filter(function (part) {
                return part.which === 'HEADER';
            })[0].body.subject[0];
        });

        console.log(subjects);
        // =>
        //   [ 'Hey Chad, long time no see!',
        //     'Your amazon.com monthly statement',
        //     'Hacker Newsletter Issue #445' ]
    });
});

});`

Error-(node:19907) UnhandledPromiseRejectionWarning: Error: self signed certificate
at TLSSocket.onConnectSecure (_tls_wrap.js:1497:34)
at TLSSocket.emit (events.js:315:20)
at TLSSocket._finishInit (_tls_wrap.js:932:8)
at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:706:12)
at Socket.ondata (internal/js_stream_socket.js:77:22)
at Socket.emit (events.js:315:20)
at addChunk (internal/streams/readable.js:309:12)
at readableAddChunk (internal/streams/readable.js:284:9)
at Socket.Readable.push (internal/streams/readable.js:223:10)
at TCP.onStreamRead (internal/stream_base_commons.js:188:23)
(Use node --trace-warnings ... to show where the warning was created)
(node:19907) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:19907) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

[puneeth-techie]

This may helpful. https://stackoverflow.com/questions/45088006/nodejs-error-self-signed-certificate-in-certificate-chain