import { McpStrategy } from '../types';
/**
 * Merge native and incoming MCP server configurations according to strategy.
 * @param base Existing native MCP config object.
 * @param incoming Ruler MCP config object.
 * @param strategy Merge strategy: 'merge' to union servers, 'overwrite' to replace.
 * @param serverKey The key to use for servers in the output (e.g., 'servers' for Copilot, 'mcpServers' for others).
 * @returns Merged MCP config object.
 */
export declare function mergeMcp(base: Record<string, unknown>, incoming: Record<string, unknown>, strategy: McpStrategy, serverKey: string): Record<string, unknown>;