const { client, close } = await FeatureBoardService.init('env-api-key', ['audiences', 'of', 'user'], {
const featureValue = client.getFeatureValue('my-feature-key', fallbackValue)
const unsubscribe = subscribeToFeatureValue('my-feature-key', fallbackValue, (onValue) => {
// Will be called with the initial value and subsiquent updates