counter.js

// counter.js
// Converted from counter.coffee 
//

const getCounterCollection = (collection) => collection.rawCollection()

const callCounter = function (method, collection, ...args) {
  const Counters = getCounterCollection(collection)
  return Meteor.wrapAsync(Counters[method].bind(Counters))(...Array.from(args || []))
}

const _deleteCounters = (collection) =>
  callCounter('remove', collection, {}, { safe: true })

const _incrementCounter = function (collection, counterName, amount) {
  if (amount == null) {
    amount = 1
  }
  const newDoc = callCounter(
    'findAndModify',
    collection,
    { _id: counterName }, // query
    null, // sort
    { $inc: { next_val: amount } }, // update
    { new: true, upsert: true } // options
  ) // callback added by wrapAsync
  if (newDoc && newDoc.value && newDoc.value.next_val) {
    return newDoc.value.next_val
  }
  return null
}

const _decrementCounter = function (collection, counterName, amount) {
  if (amount == null) {
    amount = 1
  }
  return _incrementCounter(collection, counterName, -amount)
}

const _setCounter = function (collection, counterName, value) {
  callCounter('update', collection, { _id: counterName }, { $set: { next_val: value } })
}

// Any variables defined without const/var/let are 'published' for the package... this is
// done in package.js

incrementCounter = _incrementCounter
decrementCounter = _decrementCounter
setCounter = _setCounter
deleteCounters = _deleteCounters