Function isRepeated

src/repeat.js:19–29

(value, previousEvents)

//  - Can take up some memory, but it should be cleaned up by
//    `removeListener()`, i.e. once `eventListener` is garbage collected.
export const isRepeated = (value, previousEvents) => {
  const previousEvent = getPreviousEvent(value)

  if (previousEvents.includes(previousEvent)) {
    return true
  }

  // eslint-disable-next-line fp/no-mutating-methods
  previousEvents.push(previousEvent)
  return false
}

// Serialize `value` into a short fingerprint.
// We truncate fingerprints to prevent consuming too much memory in case `value`