Function apiTypeOf

apiTypeOf(index: Index, target: unknown): string | null
The indexed type of a live SDK object, or null when it carries no brand the index knows.
Parameters
- index: Index
- target: unknown
Returns string | null

Remarks
SDK objects answer true for an isI<Name> brand per interface they implement — the SDK's own convention for runtime type checks — so the brand names are the type names. An object usually carries several (a named range is an INamedRange AND an ICellRange); the most derived one wins, because its listing reaches the others through extends and the reverse is not true.