Comments (1)
jamesbrobb
commented on July 4, 2024
1
A couple of solutions.
The first creates a Tuple the length of the low number and a Tuple the length of the high number (both populated with numbers), converts them both to unions using T[number] and then uses Exclude to remove the overlap of low and high.
type TupleOfLength<N extends number, R extends number[] = []> = R['length'] extends N ? R : TupleOfLength<N, [...R, R['length']]>
type NumberRange<
L extends number,
H extends number,
LT extends number[] = TupleOfLength<L>,
HT extends number[] = TupleOfLength<H>
> = Exclude<HT[number] | H, LT[number]>
The second uses the same idea as your solution (starting with nevers and then filling the rest with numbers), but uses a single utility type to achieve it
type NumberRange<L extends number, H extends number, FillWithNums extends boolean = false,
R extends number[] = []> =
R['length'] extends H ?
L | R[number] | H:
NumberRange<
L,
H,
FillWithNums extends true ? true : R['length'] extends L ? true : false,
[...R, FillWithNums extends true ? R['length'] : never]
>
from type-challenges-solutions.
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