export declare const SECRET_HOST_PATTERN_RE: RegExp;
export declare const SECRET_HOST_MAX = 253;
export declare const SECRET_HOSTS_MAX = 64;
export declare const normalizeHostPattern: (raw: string) => string | undefined;
export declare const normalizeHost: (raw: string) => string | undefined;
export declare const hostMatches: (pattern: string, host: string) => boolean;
export declare const hostCovers: (entry: string, host: string) => boolean;
export declare const hostAllowed: (patterns: readonly string[], host: string) => boolean;
export interface HostGuardSetting {
    readonly guard: boolean;
    readonly hosts: readonly string[];
}
export declare const tightensHostGuard: (current: HostGuardSetting | undefined, next: HostGuardSetting) => boolean;
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