Function isAlpha

isAlpha(target: string, locale?: string): Result<boolean | undefined>
Tests whether if the string contains only letters valid for the locale. For the US his would be (a-zA-Z).

Example
```
expect(isAlpha('hello').value).toBeTruthy()
```
Parameters
- target: string
  
  The target string
- locale: string = 'en-US'
  
  The locale argument, defaults to 'en-US'
Returns Result<boolean | undefined>
- Defined in validators/isAlpha.ts:36

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