Is there a method in Typescript that guarantees the value of a number will be less than or greater than a certain threshold? Currently, it permits the specification of a range of values, but I'm unsure about comparison.
This is similar to what I have in mind:
interface Input {
value: number < 1
}
Currently, there are no features in the programming language that enable you to define types in that manner.
This solution may not be the most practical, but it addresses the TypeScript side as well. Despite its unsophisticated nature, I have devised a workaround.
Here are some limitations to consider:
In response to your query, using my utilities, here is the proposed solution:
// Below are the definitions of these variables that you can refer to
interface Input {
value: AllGreaterThan<1, OneToOneHundred>
}
Essentially, this approach mandates that value be an integer ranging from 2 to 99. If you wish to delve deeper, take a look at the provided source code below. Otherwise, simply copy and paste it into an isolated environment for seamless implementation...
// For instance, "0|1|2" -> ["0", "1|2"]
type Decompose<S> = S extends `${infer FirstNumber}|${infer RestOfSet}` ? [FirstNumber, RestOfSet] : never;
// This method utilizes basic array indexing to achieve the desired outcome, although not the optimal choice
type OneHundredNumber= [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99];
type OneToOneHundred = "0"|"1"|"2"|"3"|"4"|"5"|"6"|"7"|"8"|"9"|"10"|"11"|"12"|"13"|"14"|"15"|"16"|"17"|"18"|"19"|"20...
// @ts-expect-error: ignore because typescript requires explicit matches but it's not practical here
type DecomposedNumber<S> = ToNumber<Decompose<S>[0]>
// The maximum value allowed is 44, making this table sufficient for the task
type FortyFive = '0|1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31|32|33|34|35|36|37|38|39|40|41|42|43|44|45|end'
type AllGreaterThan<LessThanThis extends number | string, RangeToReturn extends ...
export type OneToOneHundredNumber = 0|1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31|32|33|34|35|36|37|38|39|40|41|42|43|44|45|46|47|48|49|50|51|52|53|54|55|56|57|58|59|60|61|62|63|64|65|66|67|68|69|70|71|72|73|74|75|76|77|78|79|80|81|82|83|84|85|86|87|88|89|90|91|92|93|94|95|96|97|98|99
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