export declare class KeyVault {
    private keyMappings;
    private readonly KEY_PATTERNS;
    /**
     * Generate a random key with the same format as the original
     */
    private generateRandomKey;
    /**
     * Detect and redact API keys in text
     * Returns both redacted text and list of detected keys
     */
    redactKeys(text: string): {
        redactedText: string;
        detectedCount: number;
    };
    /**
     * Restore real API keys in text (for LLM responses and tool calls)
     */
    restoreKeys(text: string): {
        restoredText: string;
        restoredCount: number;
    };
    /**
     * Check if text contains any API keys (real or redacted)
     */
    containsKeys(text: string): boolean;
    /**
     * Get statistics about redacted keys
     */
    getStats(): {
        totalKeys: number;
        byProvider: Record<string, number>;
        oldestKey?: {
            provider: string;
            ageMinutes: number;
        };
        newestKey?: {
            provider: string;
            ageMinutes: number;
        };
        averageAge: number;
    };
    /**
     * Get keys older than specified age in minutes
     */
    getOldKeys(maxAgeMinutes: number): Array<{
        provider: string;
        ageMinutes: number;
        lastUsedMinutes: number;
        useCount: number;
    }>;
    /**
     * Clean up keys older than specified age in minutes
     * Returns number of keys removed
     */
    cleanupOldKeys(maxAgeMinutes: number): number;
    /**
     * Clean up keys not used for specified time in minutes
     * Returns number of keys removed
     */
    cleanupUnusedKeys(unusedMinutes: number): number;
    /**
     * Get age of a specific redacted key in minutes
     */
    getKeyAge(redactedKey: string): number | null;
    /**
     * Get detailed info about all stored keys
     */
    getAllKeysInfo(): Array<{
        provider: string;
        redactedPrefix: string;
        ageMinutes: number;
        lastUsedMinutes: number;
        useCount: number;
    }>;
    /**
     * Get comprehensive statistics for UI display
     */
    getStatistics(): {
        totalKeys: number;
        keys: Array<{
            provider: string;
            redactedPrefix: string;
            detectedAt: Date;
            age: number;
            useCount: number;
        }>;
    };
    /**
     * Clear all stored key mappings (use when starting new chat session)
     */
    clear(): void;
    /**
     * Process a chat message before sending to LLM
     */
    processOutgoingMessage(message: string): string;
    /**
     * Process a response from LLM before showing to user
     */
    processIncomingMessage(message: string): string;
}
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