import type { ContentSecurityPolicyOptions, HeaderValue, StrictTransportSecurityOptions } from "./types";
export declare function assertNoCrlf(value: string, context: string): void;
export declare function assertSafeHeaderValue(name: string, value: string): void;
export declare function validateHeaders(headers: Record<string, HeaderValue> | undefined): void;
export declare function validateCspOptions(options: ContentSecurityPolicyOptions | undefined): void;
export declare function validateStrictTransportSecurityOptions(options: StrictTransportSecurityOptions | undefined): void;