/**
 * Cookie helpers for session-token flows on Workers.
 *
 * No external dep — just parse/serialize per RFC 6265 with the modern
 * attributes we actually use (HttpOnly, Secure, SameSite, Max-Age, Path).
 */
export interface CookieOptions {
    maxAge?: number;
    path?: string;
    domain?: string;
    secure?: boolean;
    httpOnly?: boolean;
    sameSite?: 'Strict' | 'Lax' | 'None';
    expires?: Date;
}
/**
 * Build a `Set-Cookie` string. Defaults are tuned for a session cookie:
 * HttpOnly, Secure, SameSite=Lax, Path=/.
 */
export declare function serializeCookie(name: string, value: string, opts?: CookieOptions): string;
/**
 * `Set-Cookie` value that clears a previously-set cookie. Pass the same `path`
 * (and `domain` if any) used when it was set.
 */
export declare function clearCookie(name: string, opts?: Pick<CookieOptions, 'path' | 'domain'>): string;
/** Parse a `Cookie` header into a name → value map. Values are URL-decoded. */
export declare function parseCookieHeader(header: string | null | undefined): Record<string, string>;
/** Convenience: pull one cookie value from a `Request`. */
export declare function getCookie(req: Request, name: string): string | undefined;
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