Type Alias PrivateIntRange<Start, End, Step, Gap, List, EndLengthTuple>

PrivateIntRange: Gap extends 0
    ? List["length"] extends End
        ? Exclude<List[number], never>
        : PrivateIntRange<Start, End, Step, Gap, [...List, List["length"]]>
    : List extends [...(infer U), ...EndLengthTuple]
        ? Exclude<List[number], never>
        : PrivateIntRange<
            Start,
            End,
            Step,
            Gap,
            [...List, List["length"], ...TupleOf<Gap, never>],
        >

The actual implementation of IntRange. It's private because it has some arguments that don't need to be exposed.

Type Parameters

Start extends number
End extends number
Step extends number
Gap extends number = Subtract<Step, 1>
List extends unknown[] = TupleOf<Start, never>
EndLengthTuple extends unknown[] = TupleOf<End>

Type Alias PrivateIntRange<Start, End, Step, Gap, List, EndLengthTuple>

Type Parameters

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