function generateExpiry(headers = {}, defaultCacheControl) {
  const cacheControl = mergeCacheControl(parseCacheControl(headers['cache-control']), defaultCacheControl);

  const now = Date.now();
  let expires = now;

  if (headers.expires) {
    expires = typeof headers.expires === 'string' ? Number(new Date(headers.expires)) : headers.expires;
  }
  if (now >= expires) {
    expires = now + cacheControl.maxAge;
  }

  return {
    expires,
    expiresIfError: expires + cacheControl.staleIfError
  };
}
function generateExpiry(headers = {}, defaultCacheControl) {
  const cacheControl = mergeCacheControl(parseCacheControl(headers['cache-control']), defaultCacheControl);

  const now = Date.now();
  let expires = now;

  if (headers.expires) {
    expires = typeof headers.expires === 'string' ? Number(new Date(headers.expires)) : headers.expires;
  }
  if (now >= expires) {
    expires = now + cacheControl.maxAge;
  }

  return {
    expires,
    expiresIfError: expires + cacheControl.staleIfError
  };
}
function generateExpiry ( headers = { } , defaultCacheControl ) { const cacheControl = mergeCacheControl ( parseCacheControl ( headers [ 'cache-control' ] ) , defaultCacheControl ) ; const now = Date . now ( ) ; let expires = now ; if ( headers . expires ) { expires = typeof headers . expires === 'string' ? Number ( new Date ( headers . expires ) ) : headers . expires ; } if ( now >= expires ) { expires = now + cacheControl . maxAge ; } return { expires , expiresIfError : expires + cacheControl . staleIfError } ; }
Generate expiry object from 'headers'
@param {Object} [headers]
@param {Object} defaultCacheControl
@returns {Number}
Generate expiry object from headers