core: add type checking to pwmetrics-events (#6980)
core: add type checking to pwmetrics-events (#6980)


wardpeet/lighthouse,GoogleChrome/lighthouse,GoogleChrome/lighthouse,GoogleChrome/lighthouse,wardpeet/lighthouse,ev1stensberg/lighthouse,wardpeet/lighthouse,GoogleChrome/lighthouse,ev1stensberg/lighthouse,deepanjanroy/lighthouse,deepanjanroy/lighthouse,wardpeet/lighthouse,umaar/lighthouse,umaar/lighthouse,deepanjanroy/lighthouse,ev1stensberg/lighthouse,umaar/lighthouse,deepanjanroy/lighthouse,wardpeet/lighthouse,umaar/lighthouse,GoogleChrome/lighthouse,deepanjanroy/lighthouse,ev1stensberg/lighthouse