$ExpirationPolicy.fromJson constructor
      
      $ExpirationPolicy.fromJson(
    
    
- Map json_
 
Implementation
$ExpirationPolicy.fromJson(core.Map json_)
  : this(ttl: json_['ttl'] as core.String?);
$ExpirationPolicy.fromJson(core.Map json_)
  : this(ttl: json_['ttl'] as core.String?);