How to get Type of Array in Typescript generics

Question

I have a method like this:

public select(fieldName: keyof TType)

Where TType could be an array type. In case of an array type

Answer 1

Using TType[0] as the type is working for me in practice. So, in your example:

public select(fieldName: keyof TType[0])

As ugly as that is, it seems to work!