finding most common senders in gmail - apps script

appsscript.json

{
  "timeZone": "America/New_York",
  "oauthScopes": [
    "https://www.googleapis.com/auth/gmail.addons.execute",
    "https://www.googleapis.com/auth/gmail.readonly"
  ],
  "gmail": {
    "name": "find common gmail senders",
    "logoUrl": "https://www.gstatic.com/images/icons/material/system/1x/receipt_black_24dp.png",
    "primaryColor": "#41f470",
    "secondaryColor": "#94f441"
  },
  "exceptionLogging": "STACKDRIVER",
  "runtimeVersion": "V8"
}

Code.gs

// this is pretty quick and rough.. but it works
// script.google.com
// settings to allow editing the appscript.json
// set these two files
// then hit Run with function 'run'


const all = {};

function run() {
  collect();
  const commonsenders = Object.entries(all).sort((a, b) => b[1] - a[1]).filter(ent => ent[1] > 1);
  commonsenders.forEach(sender => {
    console.log(sender.join(':'));
  });
}

function collect() {
  for (const start of [0, 500, 1000, 1500, 2000])
  for (const thread of threads = GmailApp.getInboxThreads(start, 500)) {
    const msgs = thread.getMessages();
    const msg = msgs[0];
    const from = msg.getFrom();
    all[from] = all[from] || 0;
    all[from]++;
  }
}

Yeah, Apps Script is more comfortable than NodeJS terminal, but Apps Script is very limited by Google, it runs too slowly in Google system, it has daily data limit, execution time limit and so on. So, I guess MBOX file and NodeJS seems optimal solution to analyze large mailbox.