Typesafing Recursion Through Generics?

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I'm trying to find a way to typesafe a recursion (which returns a number by the end) using generics.

What I tried:

function recursion<N,T>(value:N, lim:N):T|N {
        if(value < lim) return recursion<N, T>(value+1,lim);

        return value;
}

recursion<number, Function>(0,10);

Despite passing type number, Typescript decided to give me an error:

TSError: ⨯ Unable to compile TypeScript:
src/main.ts:2:41 - error TS2365: Operator '+' cannot be applied to types 'N' and 'number'.

2  if(value < lim) return recursion<N, T>(value+1,lim);

I assumed that operations were possible as long as I passed number type on the generic, but it doesn't seem to be the case. Why is that and is there any possible workaround?



from Recent Questions - Stack Overflow https://ift.tt/3amAEXw
https://ift.tt/eA8V8J

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