Type 'number[]' is missing the following properties from type '[number, number, number]': 0, 1, 2

[skaletaPL]

Type 'number[]' is missing the following properties from type '[number, number, number]': 0, 1, 2

[generalProf]

I faced this and found the solution to it.

The problem is, when you're setting the event variable, you write the start property like so:
const event = { start: [0, 0, 0, 0, 0] }

Typescript will see "start" as number[] which is correct because it inferred the type, it's an array of numbers. But the createEvent method expects an array with 5 numbers like [Number, Number, Number, Number, Number].

To resolve the issue you have to set the type of the event object to the EventAttributes:
const event:ics.EventAttributes = { start: [0, 0, 0, 0, 0] }

This will make typescript not infer the type. As far as I'm aware this is the correct behavior from typescript.