tsc error on @Event()

[olivier65]

Stencil version:

 @stencil/core@2.6.0

I'm submitting a:
[x] bug report
[ ] feature request
[ ] support request

Current behavior:
tsc puts "Property 'alarmsUpdated' has no initializer and is not definitely assigned in the constructor." when encountering the @Event() alarmsUpdated: EventEmitter<Alarm[]> declaration.

Expected behavior:
No error.

Steps to reproduce:
See the project files in issues stenciljs/store#73.

[olivier65]

The workaround is to declare the event as @Event() alarmsUpdated: EventEmitter<Alarm[]>! (i.e., with a non-null operator at the end) or turn off strictPropertyInitialization in tsconfig. Props to Mark Cianfrani on Slack for the solution.