variant method
Get variant assigned by flagkey
Implementation
ExperimentVariant? variant(String flagKey) {
final sourceAndVariant = _getSourceAndVariant(flagKey);
final variant = sourceAndVariant?.variant;
if (_config?.automaticExposureTracking != null &&
_config!.automaticExposureTracking!) {
exposure(flagKey);
}
_log('[Experiment] Variant for $flagKey is ${variant?.value}');
return variant;
}