/**
 * Configuration Manager for Smart Tiered Cache
 * Handles loading configuration from files (JSON/YAML) and environment variables.
 * Requirements: 10.1, 10.2, 10.3, 10.4, 10.5
 */
/**
 * Eviction policy types supported by the cache engine.
 */
export type PolicyType = 'lru' | 'lfu' | 'hybrid';
/**
 * Complete cache configuration interface.
 * Contains all configurable options for the Smart Tiered Cache system.
 */
export interface CacheConfig {
    redisPort: number;
    dashboardPort: number;
    maxConnections: number;
    ramTierMaxBytes: number;
    ssdTierMaxBytes: number;
    hotThreshold: number;
    warmThreshold: number;
    coldThreshold: number;
    evictionPolicy: PolicyType;
    snapshotIntervalMs: number;
    predictionEnabled: boolean;
    maxPrefetchCount: number;
    accessWindowMs: number;
    tierMovementIntervalMs: number;
    dbConnectionString: string;
}
/**
 * Validation result for configuration validation.
 */
export interface ValidationResult {
    valid: boolean;
    errors: ValidationError[];
}
/**
 * Individual validation error.
 */
export interface ValidationError {
    key: string;
    message: string;
    value: unknown;
}
/**
 * Default configuration values.
 */
export declare const DEFAULT_CONFIG: CacheConfig;
/**
 * ConfigManager class for managing cache configuration.
 * Supports loading from JSON/YAML files and environment variables.
 */
export declare class ConfigManager {
    private config;
    constructor();
    /**
     * Load configuration from a JSON or YAML file.
     * @param filePath - Path to the configuration file
     * @throws Error if file cannot be read or parsed
     */
    loadFromFile(filePath: string): Promise<void>;
    /**
     * Load configuration from environment variables.
     * Environment variables are prefixed with CACHE_ (e.g., CACHE_REDIS_PORT).
     */
    loadFromEnv(): void;
    /**
     * Get a specific configuration value by key.
     * @param key - The configuration key
     * @returns The configuration value
     */
    get<T>(key: string): T;
    /**
     * Get the complete configuration object.
     * @returns A copy of the current configuration
     */
    getAll(): CacheConfig;
    /**
     * Update a configuration value at runtime.
     * @param key - The configuration key to update
     * @param value - The new value
     * @returns true if update was successful, false otherwise
     */
    update(key: string, value: unknown): boolean;
    /**
     * Validate the current configuration.
     * @returns ValidationResult with any errors found
     */
    validate(): ValidationResult;
    /**
     * Validate configuration and apply defaults for invalid values.
     * Logs errors for each invalid value before resetting to default.
     * This method fulfills requirement 10.5: log error and use default values for invalid configuration.
     * @returns ValidationResult with errors that were found and corrected
     */
    validateAndApplyDefaults(): ValidationResult;
    /**
     * Merge partial configuration into current config.
     */
    private mergeConfig;
    /**
     * Parse an environment variable value to the appropriate type.
     */
    private parseEnvValue;
    /**
     * Validate a single configuration value.
     */
    private validateSingleValue;
    /**
     * Check if a port number is valid.
     */
    private isValidPort;
}
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