Function fromGuard

fromGuard<T>(guard, reason): Validator<T>

Turn a type guard into a validator

Type Parameters

T
The validated type

Parameters

guard: Guard<T>
The guard to convert
reason: string
The failure explanation if invalid

Returns Validator<T>

Example

const guard = (input): input is number =>
    typeof input === "number" && !isNaN(input);

  const isNumber = fromGuard(guard, "Not a number");

  isNumber(1) >>
    {
      valid: true,
      parsed: 1,
    };