Metro not recognized as keyof EventTypes

[beetroop]

Hi

Small issue, but the typescript type for "metro" event is not recognized by the type engine despite working at runtime.

Would you accept a PR to fix this? Also happy to help with any other work you need done on the javascript side of things.

Cheers

[nick-thompson]

Hey @beetroop apologies for the delay here! I'd happily take a PR for that if you're willing!