export function flattenMessages(nestedMessages: { [key: string]: any }, prefix = ''): { [key: string]: string } {
  return Object.keys(nestedMessages).reduce((messages, key) => {
    const value = nestedMessages[key]
    const prefixedKey = prefix ? `${prefix}.${key}` : key

    if (typeof value === 'string') {
      messages[prefixedKey] = value
    } else {
      Object.assign(messages, flattenMessages(value, prefixedKey))
    }

    return messages
  }, {})
}