Usage.fromJson constructor
Deserialise from JSON.
Implementation
factory Usage.fromJson(Map<String, dynamic> json) => Usage(
inputTokens: json['input_tokens'] as int?,
outputTokens: json['output_tokens'] as int?,
outputTokensBreakdown: (json['output_tokens_breakdown'] as Map<String, dynamic>?)?.map((k, v) => MapEntry(k, v as int)),
totalTokens: json['total_tokens'] as int?,
);