import type { ElnoraConfig } from "../types.js";
import type { TokenStore } from "./token-store.js";
/**
 * Validate an API key against the Elnora platform.
 *
 * Uses a short-lived cache (TTL {@link CACHE_TTL_SECONDS}s) keyed by an
 * HMAC of the raw key so repeated validations within the window skip the
 * platform round-trip. The raw key is never persisted. Only successful
 * validations are cached; failures always re-hit the platform so a user
 * who regenerates a revoked key isn't stuck with a stale 'no' answer.
 *
 * Cache errors (read or write) are logged but never block the request —
 * the function falls through to the direct validation path, matching
 * pre-cache behavior.
 */
export declare function validateApiKey(token: string, config: ElnoraConfig, store: Pick<TokenStore, "getApiKeyValidation" | "setApiKeyValidation">): Promise<{
    userId: string;
} | null>;
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