import type { EngineResult } from "./types.js";
/** Whether error text reads as a quota window rather than a fault. Engine
 *  results are one caller; a settled attempt's stored error is the other, and
 *  both have to reach the same verdict or the same outage reads two ways.
 *
 *  Throttling and allowance are one verdict here: the caller waits either way. */
export declare function isRateLimitMessage(text: string | null | undefined): boolean;
export interface RateLimitDetection {
    limited: boolean;
    /** Unix timestamp in seconds */
    resetsAt?: number;
}
/** Human-facing provider/engine name for rate-limit state and notifications. */
export declare function rateLimitEngineLabel(engine: string): string;
/**
 * Detect whether an engine result indicates a dead/expired session rather than
 * a transient or rate-limit error. A dead session is one where the engine exited
 * with an error but did zero work (no cost, no turns) and there is no rate-limit
 * signal — meaning the --resume ID is stale and should not be retried.
 */
export declare function isDeadSessionError(result: EngineResult): boolean;
export declare function detectRateLimit(result: EngineResult): RateLimitDetection;
export declare function computeRateLimitDeadlineMs(resetsAtSeconds?: number, extraMs?: number): number;
export declare function computeNextRetryDelayMs(resetsAtSeconds?: number): {
    delayMs: number;
    resumeAt?: Date;
};
/**
 * A limit that named no reset gives a parked session nothing to sleep to, so
 * every retry against it is a guess. These two bound the guessing: the wait
 * doubles until it settles at half an hour, and the park gives up well before
 * the six-hour deadline would have let it poke the engine ~360 times.
 *
 * A limit that later does name a reset leaves this path entirely — the stated
 * reset is slept to, exactly as before.
 */
export declare const MAX_UNSTATED_PARK_DELAY_MS: number;
export declare const MAX_UNSTATED_PARK_ATTEMPTS = 12;
/** The next guess: never shorter than the last one, never past the cap. */
export declare function nextUnstatedParkDelayMs(previousDelayMs: number): number;
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