Can the length of an array be determined based on a numerical variable? For example:
func(1); // outputs [string]
func(2); // outputs [string, string]
func(5); // outputs [string, string, string, string, string]
Can the length of an array be determined based on a numerical variable? For example:
func(1); // outputs [string]
func(2); // outputs [string, string]
func(5); // outputs [string, string, string, string, string]
To generate string tuples of a specific length N, you can define a recursive conditional type called StringTuple:
type StringTuple<N extends number, T extends string[] = []> =
N extends T['length'] ? T : StringTuple<N, [...T, string]>
The StringTuple type constructs the desired string tuple by adding an extra string to an accumulating parameter
T</code until its length equals <code>Ntype Test = StringTuple<3>
// type Test = [string, string, string]
With StringToTuple in place, defining the func signature is simple:
declare const func: <N extends number>(length: N) => StringTuple<N>
const t1 = func(1)
// const t1: [string]
const t2 = func(2)
// const t2: [string, string]
const t5 = func(5)
// const t5: [string, string, string, string, string]
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