Google Apps Script: auto reply `@dependabot merge`

@dependabot merge.js

// MIT LICENSE ©️ azu
// Usage:
// 1. Create `MERGE_REPLY_LABEL`
// 2. Upload GAS
// 3. Update CONFIG
// 4. Execute `createTimeTrigger` function on GAS 
// === CONFIG ====
// Interval hours
const FETCH_INTERVAL_HOURS = 12;
const YOUR_MAIL_ADDRESS = "{yourmail}@gmail.com"
const MERGE_REPLY_LABEL = "dependabot-merge";
function fetchPublishedMails() {
    const now = Math.floor(new Date().getTime() / 1000);
    const timeTerm = now - (60 * 60 * FETCH_INTERVAL_HOURS);
    // -label does not apply thread
    // https://webapps.stackexchange.com/questions/62881/exclude-label-from-a-gmail-search
    // -cc:comment@noreply.github.com
    // ignore comment = thread
    const strTerms = `after:${timeTerm} from:dependabot[bot] <notifications@github.com> deliveredto:${YOUR_MAIL_ADDRESS} -l:${MERGE_REPLY_LABEL} -cc:comment@noreply.github.com`;
    console.log("Search: ", strTerms);
    return GmailApp.search(strTerms);

}

/**
 * Creates time triggers.
 */
function createTimeTrigger() {
    ScriptApp.newTrigger('main')
        .timeBased()
        .everyHours(FETCH_INTERVAL_HOURS)
        .create();
}

function main() {
    const threadList = fetchPublishedMails()
    if (threadList.length === 0) {
        console.log("No new mail");
        return;
    }
    console.log("New mail threads: " + threadList.length);
    if (threadList.length > 100) {
        throw new Error("Too many replyTo");
    }
    threadList.forEach((mainThreads, index) => {
        const message = mainThreads.getMessages()?.[0];
        if (!message) {
            return;
        }
        const replyTo = message.getReplyTo();
        console.log("replyTo", replyTo);
        // need to embed replayTo into body for recognizing by GitHub
        // dependabot[bot] ***@***.***
        message.reply(`@dependabot merge

${new Date().toLocaleString()} ${replyTo}
`);
        mainThreads.addLabel(GmailApp.getUserLabelByName(MERGE_REPLY_LABEL));
        Utilities.sleep(1000);
    });

}