Function isStringYearValue

isStringYearValue(value: unknown): value is string
Check if given is a string representing a CronYearValue.

Example
```
isStringYearValue("1989"); // true
isStringYearValue("3000"); // false
```
Returns
Returns true if is a string representing a CronYearValue, false otherwise.
Parameters
- value: unknown
  
  Value to check.
Returns value is string
- Defined in src/validations/isStringYearValue.ts:15