export type CacheControlDirectives = Map<string, string | true>;
export interface VaryHeader {
    star: boolean;
    headers: Set<string>;
}
export declare function getHeaderValueCaseInsensitive(headers: Record<string, string>, headerName: string): string | undefined;
export declare function parseCacheControl(headerValue: string | undefined): CacheControlDirectives;
export declare function hasDirective(directives: CacheControlDirectives, directiveName: string): boolean;
export declare function getDirectiveValue(directives: CacheControlDirectives, directiveName: string): string | true | undefined;
export declare function parseNonNegativeInteger(value: string): number | undefined;
export declare function parseVaryHeader(headerValue: string | undefined): VaryHeader;
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