Bare Export.js

{
  "translatorID": "4760d5ea-7bbf-4fce-a29c-f88e508eecd7",
  "label": "Bare Export",
  "description": "Dumps Zotero export objects to JSON",
  "creator": "Emiliano Heyns",
  "target": "json",
  "minVersion": "4.0.27",
  "maxVersion": "",
  "configOptions": {
    "getCollections": true
  },
  "displayOptions": {
    "exportNotes": true,
    "exportFileData": false
  },
  "translatorType": 2,
  "browserSupport": "gcsv",
  "priority": 49,
  "inRepository": false
}

function doExport() {
  const items = [];
  let item;
  while (item = Zotero.nextItem()) {
    items.push(item);
  }

  const collections = [];
  let collection;
  while (collection = Zotero.nextCollection()) {
    collections.push(collection)
  }

  Zotero.write(JSON.stringify({ items, collections }, null, 2));
}