message: Fix usage of const causing UglifyJS fail on date-fns (closes
diff: -export const protectedTokens = ['D', 'DD', 'YY', 'YYYY']
  +export var protectedTokens = ['D', 'DD', 'YY', 'YYYY']
  export function isProtectedToken(token) {
  return protectedTokens.indexOf(token) !== -1
  