Type Alias Last<T, Options>

Last<T, Options>: IsNever<T, $SelectionBranch> extends infer R
    ? R extends $Then
        ? Options["$never"]
        : R extends $Else
            ? T["length"] extends 0
                ? Options["caseEmptyTuple"]
                : T extends readonly [...unknown[], infer R]
                    ? R
                    : T[0]
            : never
    : never

🦴 utilities

Gets the last entry in the tuple or the type of array T.

Type Parameters

T extends readonly unknown[]
Options extends Last.Options = Last.DefaultOptions

Example

type R = Last<[1, 2, 3]> // 3
type R = Last<string[]> // string

type R = Last<[]> // never

Type Param: Options['$never']

Return type when T is never. Default to never.

Type Param: Options['caseEmptyTuple']

Return type when T is []. Default to never.