export interface ConditionalResponseOptions {
    /** Entity tag to attach and compare using HTTP weak comparison for GET/HEAD. */
    readonly etag?: string;
    /** Last-modified validator to attach and compare at one-second HTTP date precision. */
    readonly lastModified?: Date;
}
/** Apply validators to a response and produce a standards-compliant 304 when it is fresh. */
export declare function conditionalResponse(request: Request, response: Response, options?: ConditionalResponseOptions): Response;
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