SpeechToText.viaApiKey constructor
Creates a SpeechToText interface using a API keys.
Implementation
factory SpeechToText.viaApiKey(String apiKey,
{String? cloudSpeechEndpoint}) =>
SpeechToText._(CallOptions(metadata: {'X-goog-api-key': '$apiKey'}),
cloudSpeechEndpoint: cloudSpeechEndpoint);