import type { Handler } from "../types";
export interface HelmetOptions {
    contentSecurityPolicy?: boolean | ContentSecurityPolicyOptions;
    crossOriginEmbedderPolicy?: boolean | {
        policy?: string;
    };
    crossOriginOpenerPolicy?: boolean | {
        policy?: string;
    };
    crossOriginResourcePolicy?: boolean | {
        policy?: string;
    };
    dnsPrefetchControl?: boolean | {
        allow?: boolean;
    };
    frameguard?: boolean | {
        action?: "deny" | "sameorigin";
    };
    hidePoweredBy?: boolean;
    hsts?: boolean | HstsOptions;
    ieNoOpen?: boolean;
    noSniff?: boolean;
    originAgentCluster?: boolean;
    permittedCrossDomainPolicies?: boolean | {
        permittedPolicies?: string;
    };
    referrerPolicy?: boolean | {
        policy?: string | string[];
    };
    xssFilter?: boolean;
}
interface ContentSecurityPolicyOptions {
    directives?: Record<string, string | string[]>;
    reportOnly?: boolean;
}
interface HstsOptions {
    maxAge?: number;
    includeSubDomains?: boolean;
    preload?: boolean;
}
export declare function helmet(options?: HelmetOptions): Handler;
export {};
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