Welcome react.js

/*
emoji:welcome
*/

var payload = JSON.parse(current.payload);
var message = {
    "text": "Welcome to SNDevs slack",
    "blocks": [{
            "type": "header",
            "text": {
                "type": "plain_text",
                "text": "Hello and welcome to SNDevs slack!"
            }
        },
        {
            "type": "divider"
        },
        {
            "type": "section",
            "text": {
                "type": "mrkdwn",
                "text": "*Here are some tips to get you started*"
            }
        },
        {
            "type": "header",
            "text": {
                "type": "plain_text",
                "text": "Asking Good questions"
            }
        },
        {
            "type": "divider"
        },
        {
            "type": "section",
            "text": {
                "type": "mrkdwn",
                "text": " • Use Threads! #general gets busy so make sure to keep conversation about your question in the original thread. \n • Write a title that summarizes the specific problem. \n • Pretend you're talking to a busy colleague.\n • Spelling, grammar, and punctuation are important! \n • Bad: GlideRecord isn't working \n • Good: Why does str == 'value' evaluate to false when str is set to 'value' in my script? \n • Proof-read before posting! \n • Post the question and respond to feedback"
            }
        },
        {
            "type": "header",
            "text": {
                "type": "plain_text",
                "text": "Posting Code"
            }
        },
        {
            "type": "divider"
        },
        {
            "type": "section",
            "text": {
                "type": "mrkdwn",
                "text": " • Introduce the problem before you post any code. \n • Help others reproduce the problem. Don't just copy in your entire script. \n- Do not post images of code, data, error messages (just copy the text).\n • When posting code wrap it in 1x and 3x back-tick [`] syntax, or use the code editor \n ````your text` = Red highlighted single-line``` \n ``````your text`````` ```= Grey highlighted multi-line``` \n • Or use the </> code button on the text editor in slack."
            }
        },
        {
            "type": "header",
            "text": {
                "type": "plain_text",
                "text": "Give Points to say thank you!"
            }
        },
        {
            "type": "divider"
        },
        {
            "type": "section",
            "text": {
                "type": "mrkdwn",
                "text": "If someone successfully helped you (or ever just help you get closer to the answer) tag them with a ++ in the thread. eg. <@" + payload.event.user + "> ++ will grant that user some community points to show how helpful they were."
            }
        },
        {
            "type": "divider"
        },
        {
            "type": "section",
            "text": {
                "type": "mrkdwn",
                "text": "Looking for more helpful tips? These tips are mostly from https://stackoverflow.com/help/how-to-ask"
            }
        }
    ]
};
//This should find any other payloads where there is already a :welcome: reaction in the thread to prevent the message from firing more than once
var count = new GlideAggregate('x_snc_slackerbot_payload');
count.addQuery('sys_created_on', '>', gs.hoursAgoStart(12));
count.addQuery('payload', 'CONTAINS', '"type": "reaction_added"');
count.addQuery('payload', 'CONTAINS', '"reaction": "welcome"');
count.addQuery('payload', 'CONTAINS', '"item_user": "' + payload.event.item_user);
count.addQuery('payload', 'CONTAINS', '"channel": "' + payload.event.item.channel);
count.query();

if (count.getRowCount() < 2) {
    new x_snc_slackerbot.Slacker().send_chat(current, message, true);
}