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/**
* Implements fast shallow verification of hostnames. This does not perform a
* struct check on the content of labels (classes of Unicode characters, etc.)
* but instead check that the structure is valid (number of labels, length of
* labels, etc.).
*
* If you need stricter validation, consider using an external library.
*/
/**
* Check if a hostname string is valid. It's usually a preliminary check before
* trying to use getDomain or anything else.
*
* Beware: it does not check if the TLD exists.
*/
export default function (hostname: string): boolean;
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