Optional _api
_api: undefined | { answerQuestion: any; chitchat: any; classifyTopic: any; commonsenseReasoning: any; getConceptnetRelations: any; getSentiment: any; matchIntent: any; measureSimilarity: any; paraphraseSentence: any; parseACE: any; parseContext: any; parseText: any; parseTextTokens: any; predictNextTurn: any; renderCSS: any; resolveCoreferences: any; speechToText: any; textToSpeech: any; toVec: any }