Function isValidUsPostalCode

isValidUsPostalCode(postalCode?: string | null): boolean
Checks whether a value is a valid US postal code, in either ZIP (12345) or ZIP+4 (12345-6789) form. Surrounding whitespace is ignored.
Parameters
- OptionalpostalCode: string | null
  The postal code to check.
Returns boolean
True when the value is a well-formed US postal code.
Example
```
isValidUsPostalCode("33132"); // true
isValidUsPostalCode("33132-3204"); // true
isValidUsPostalCode("H2K 3H4"); // false
```
- Defined in utils/address/postalCodes.ts:27