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							|  | /**
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							|  |  * Tries to resolve the hostname. Returns true if succeeds.
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							|  |  *
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							|  |  * @param {String} host is the hostname from the URL.
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							|  |  * @return {Boolean}
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							|  |  */
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							|  | export default function isResolvable(host: string): Promise<boolean>;
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