type-plus/esm/number/cast.d.ts

Provides additional types for TypeScript.

/**
 * Cast a string to a number literal type if possible.
 *
 * ```ts
 * StringToNumber<'1'> // 1
 * StringToNumber<'-1'> // -1
 * ```
 */
export type StringToNumber<S extends string, Fail = never> = S extends `-0` ? 0 : S extends `${infer W}.0` ? StringToNumber<W> : S extends `${infer W}.${infer F}0` ? StringToNumber<`${W}.${F}`> : S extends `${infer N extends number}` ? N : Fail;
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