Usage.fromMap constructor
Create the object from a Map<String, dynamic>
Implementation
factory Usage.fromMap(Map<String, dynamic> map) {
return Usage(
promptTokens:
map['promptTokens'] != null ? map['promptTokens'] as int : null,
completionTokens: map['completionTokens'] != null
? map['completionTokens'] as int
: null,
totalTokens:
map['totalTokens'] != null ? map['totalTokens'] as int : null,
);
}