message: Documenting the new util file
diff: import { ReferenceMonth } from '../MonthPicker/MonthPicker'
  +/**
  + * Check if the value matches the month reference model
  + * A value corresponds to the model if it has two digits followed by a slash and four more digits
  + *
  + * @param value Input value
  + */
  export const isValidInput = (value: string) => {
  return /\d\d\/\d\d\d\d/.test(value)
  }
  +/**
  + * Format a reference month value to pt-br model (month/year)
  + *
  + * @param value A reference month to be formatted
  + */
  export const format = (value: ReferenceMonth) => {
  if (!value || !value.year || value.month == null) {
  return null
  