errors when running tsc --experimentalDecorators

[Geraldf]

Hi,

when running "tsc --experimentalDecorators" I do get a view errors. I have no idea how to solve them.

src/services/appointmentsservice.ts(6,36): error TS2339: Property 'calendar' does not exist on type 'typeof client'.
src/services/authenticationservice.ts(34,11): error TS2339: Property 'fetch' does not exist on type 'Window'.
src/services/authenticationservice.ts(87,12): error TS2345: Argument of type 'void' is not assignable to parameter of type '{} | Thenable<{}>'.
  Type 'void' is not assignable to type 'Thenable<{}>'.
src/services/authenticationservice.ts(94,12): error TS2345: Argument of type 'void' is not assignable to parameter of type '{} | Thenable<{}>'.
  Type 'void' is not assignable to type 'Thenable<{}>'.
src/services/authenticationservice.ts(101,24): error TS2339: Property 'plus' does not exist on type 'typeof client'.
/u