export interface UrlPolicy {
    /** Only these hosts (and their subdomains) may be opened. */
    allowedHosts?: string[];
    /** Refuse localhost, link-local and private-network addresses written as IPs. Default true. */
    blockPrivateNetworks?: boolean;
}
/** Normalises an address the model asked to open and refuses anything but
 *  http(s) on an allowed host. A missing scheme means https. */
export declare function checkUrl(input: string, policy?: UrlPolicy): string;
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