core(tsc): don't use index signature in LHErrors (#5896)
core(tsc): don't use index signature in LHErrors (#5896)


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