import type { RateLimitInfoCallback } from "./rate_limit_fetch.js";
/**
 * Default usage thresholds (80%, 90%, 95%) at which the observer emits a log.
 */
export declare const DEFAULT_RATE_LIMIT_THRESHOLDS: readonly number[];
/**
 * Configuration for the LoggingRateLimitObserver.
 */
export interface LoggingRateLimitObserverOptions {
    /** Usage fractions (0.0 - 1.0) that should produce a log line. */
    thresholds?: readonly number[];
    /**
     * Function used to emit the log line. Defaults to `console.warn`.
     * Useful when injecting a structured logger.
     */
    log?: (message: string) => void;
}
/**
 * Returns a ready-to-use `onRateLimitInfo` callback that logs a warning each
 * time rate limit usage crosses one of the configured thresholds.
 *
 * Example:
 *
 * ```ts
 * import { Client } from "@getlago/lago-javascript-client";
 * import { loggingRateLimitObserver } from "@getlago/lago-javascript-client";
 *
 * const client = Client(apiKey, {
 *   rateLimitRetry: { onRateLimitInfo: loggingRateLimitObserver() },
 * });
 * ```
 */
export declare function loggingRateLimitObserver(options?: LoggingRateLimitObserverOptions): RateLimitInfoCallback;