/**
 * Photon Configuration
 *
 * Manages config.json for unified Photon configuration.
 * Contains both per-photon env vars and MCP server configs.
 *
 * Location follows ncp-paths pattern:
 * - Local: .ncp/config.json (if .ncp exists in project)
 * - Global: ~/.ncp/config.json (fallback)
 */
export interface MCPServerConfig {
    command?: string;
    args?: string[];
    url?: string;
    transport?: 'stdio' | 'sse' | 'websocket';
    env?: Record<string, string>;
}
export interface PhotonConfig {
    /** Per-photon environment variable configuration */
    photons: Record<string, Record<string, string>>;
    /** MCP server configurations */
    mcpServers: Record<string, MCPServerConfig>;
}
/**
 * Get the config file path (local or global)
 */
export declare function getConfigFilePath(): string;
/**
 * Load photon configuration from config.json
 */
export declare function loadPhotonConfig(): Promise<PhotonConfig>;
/**
 * Save photon configuration to config.json
 */
export declare function savePhotonConfig(config: PhotonConfig): Promise<void>;
/**
 * Get configuration for a specific photon
 */
export declare function getPhotonEnvVars(photonName: string): Promise<Record<string, string>>;
/**
 * Set configuration for a specific photon
 */
export declare function setPhotonEnvVars(photonName: string, envVars: Record<string, string>): Promise<void>;
/**
 * Apply photon env vars to process.env
 */
export declare function applyPhotonEnvVars(envVars: Record<string, string>): void;
/**
 * Resolve environment variable references in a value
 * Supports ${VAR_NAME} syntax
 */
export declare function resolveEnvValue(value: string): string;
/**
 * Resolve all env var references in a server config
 */
export declare function resolveEnvVars(serverConfig: MCPServerConfig): MCPServerConfig;
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