async function getResult(data, context) {
  const result = await Interactive.request(data, context);
  return /** @type {LH.Artifacts.LanternMetric} */ (result);
}
Simple wrapper to just coerce return type to LanternMetric.
@param {LH.Artifacts.MetricComputationDataInput} data
@param {LH.Artifacts.ComputedContext} context
@return {Promise<LH.Artifacts.LanternMetric>}