Function defaultMaskMiddleware

defaultMaskMiddleware(value?, maskOptions?): undefined | null | string
Takes a string and masks values in quotes if at least one keyword is present in value string.
Parameters
- Optional value: null | string
  
  string value to be masked.
- Optional maskOptions: MaskOptions
  
  Options to determine how masking should be performed.
Returns undefined | null | string
either a masked string or an original string if keywords array is empty or undefined.
Example
```
const maskedString = defaultMaskMiddleware('Mask "this value" because string has a secret keyword', { keywords: ['secret'] });

console.log(maskedString); //'Mask ****** because string has a secret keyword'
```

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