Can template literal types be utilized to verify if one numeric value is greater than another?

I am attempting to define the Record for migration functions, which use the direction of the migration as the key: v${number}-v${number},

Considering that these migrations are all UP, they need to be validated as

v${first-number}-v${first-number + 1}
and first-number + 1 should not exceed a predefined limit if possible.

Can this be accomplished using template literals or does it have to be done at runtime?

Answer №1

Here is a solution that should work fine. Another option is to utilize a more universal approach to Next using tuples, but this may lead to reduced performance.

type NSeq<
    Start extends number,
    End extends number,
    Result extends number = never
> = Start extends End ? Result & number
    : NSeq<NextNum<Start>, End, Result | Start>;

type NextNum<N extends number> = [1,2,3,4,5,6,7,8,9,10,11,12][N];

type VersionMigration<From extends number, To extends number> =
    `v${From}-v${NSeq<NextNum<From>, To>}`


type V = VersionMigration<2,7>

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