/**
 * Exhaustion Registry
 *
 * Tracks which providers are currently quota-exhausted and auto-resets
 * after a configurable cooldown period. Eliminates the need for callers
 * to maintain their own exhaustion maps.
 */
export interface ExhaustionEntry {
    provider: string;
    exhaustedAt: number;
    resetAt: number;
}
export interface ExhaustionRegistrySnapshot {
    version: 1;
    defaultResetMs: number;
    entries: ExhaustionEntry[];
}
export declare class ExhaustionRegistry {
    private entries;
    defaultResetMs: number;
    constructor(defaultResetMs?: number);
    /**
     * Mark a provider as quota-exhausted.
     * Automatically clears after `resetAfterMs` (default: 5 min).
     */
    markExhausted(provider: string, resetAfterMs?: number): void;
    /**
     * Check if a provider is currently exhausted.
     * Automatically clears expired entries.
     */
    isExhausted(provider: string): boolean;
    /** Manually clear exhaustion for a provider. */
    clearExhaustion(provider: string): void;
    /** Get list of currently exhausted providers. */
    getExhaustedProviders(): string[];
    /** Get the entry for a specific provider (if exhausted). */
    getEntry(provider: string): ExhaustionEntry | undefined;
    /** Snapshot non-expired exhaustion state for external persistence. */
    snapshot(): ExhaustionRegistrySnapshot;
    /** Serialize exhaustion state for Workers KV, D1, Redis, etc. */
    serialize(): string;
    /** Restore exhaustion state onto this registry. */
    restore(snapshot: ExhaustionRegistrySnapshot | string): void;
    static deserialize(json: string): ExhaustionRegistry;
    /** Clear all exhaustion state. */
    reset(): void;
}
/** Shared singleton — same pattern as defaultCircuitBreakerManager. */
export declare const defaultExhaustionRegistry: ExhaustionRegistry;
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