import { ConfigRecord, ConfigValue, MergeOptions } from './types';
/**
 * Configuration merger with multiple strategies.
 */
export declare class ConfigMerger {
    private options;
    constructor(options?: MergeOptions);
    /**
     * Merge multiple configurations.
     */
    merge(...configs: ConfigRecord[]): ConfigRecord;
    /**
     * Merge two configurations.
     */
    mergeTwo(target: ConfigRecord, source: ConfigRecord): ConfigRecord;
    private shallowMerge;
    private deepMerge;
    private mergeArrays;
    private shouldIncludeValue;
    private isPlainObject;
}
/**
 * Deep merge configurations.
 */
export declare function deepMerge(...configs: ConfigRecord[]): ConfigRecord;
/**
 * Shallow merge configurations.
 */
export declare function shallowMerge(...configs: ConfigRecord[]): ConfigRecord;
/**
 * Replace merge (last config wins).
 */
export declare function replaceMerge(...configs: ConfigRecord[]): ConfigRecord;
/**
 * Get a value at a path.
 */
export declare function getValueAtPath<T = ConfigValue>(config: ConfigRecord, path: string, defaultValue?: T): T;
/**
 * Set a value at a path.
 */
export declare function setValueAtPath(config: ConfigRecord, path: string, value: ConfigValue): ConfigRecord;
/**
 * Delete a value at a path.
 */
export declare function deleteValueAtPath(config: ConfigRecord, path: string): ConfigRecord;
/**
 * Check if a path exists.
 */
export declare function hasPath(config: ConfigRecord, path: string): boolean;
/**
 * Get all paths in a configuration.
 */
export declare function getAllPaths(config: ConfigRecord, prefix?: string): string[];
/**
 * Configuration difference.
 */
export interface ConfigDiff {
    readonly added: Record<string, ConfigValue>;
    readonly removed: string[];
    readonly changed: Array<{
        path: string;
        oldValue: ConfigValue;
        newValue: ConfigValue;
    }>;
}
/**
 * Calculate the difference between two configurations.
 */
export declare function diffConfigs(oldConfig: ConfigRecord, newConfig: ConfigRecord): ConfigDiff;
/**
 * Flatten a nested configuration to dot-notation paths.
 */
export declare function flattenConfig(config: ConfigRecord, prefix?: string): Record<string, ConfigValue>;
/**
 * Unflatten a dot-notation configuration to nested structure.
 */
export declare function unflattenConfig(flat: Record<string, ConfigValue>): ConfigRecord;