export type IdentityResolver = (req: Request) => Promise<string | null>;
export type IdentityCookieConfig = {
    name: string;
    signingKey: string | Uint8Array;
};
export declare function defaultIdentityResolver(cfg: IdentityCookieConfig): IdentityResolver;
/**
 * Async because `crypto.subtle.sign` is the cross-runtime standard.
 * Callers building a `Set-Cookie` header must `await` this.
 */
export declare function signCookieValue(value: string, signingKey: string | Uint8Array): Promise<string>;
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