Type Alias StringToNumber<S, Fail>

StringToNumber<S, Fail>: 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

Cast a string to a number literal type if possible.

StringToNumber<'1'> // 1
StringToNumber<'-1'> // -1

Type Parameters

  • S extends string
  • Fail = never

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