The CloudAnt server says it is using CouchDB 3.4.2, and ES6 support was added to CouchDB in version 3.0…, but I am not able to use fat arrow function syntax in the online view editor for my database. Is this a limitation of the editor, or of CloudAnt?

for example:

function (keys, values, rereduce) {
  const uniqWith = (arr, fn) =>
    arr.filter(
        (element, index) => arr.findIndex((step) => fn(element, step)) === index
    );
  return uniqWith(values, (a, b) => a.moves === b.moves )
}

I get an error saying this is not a function.