/**
 * @fileoverview Loads, validates, and exports application configuration.
 * This module centralizes configuration management, sourcing values from
 * environment variables and `package.json`. It uses Zod for schema validation
 * to ensure type safety and correctness of configuration parameters.
 *
 * Key responsibilities:
 * - Load environment variables from a `.env` file.
 * - Read `package.json` for default server name and version.
 * - Define a Zod schema for all expected environment variables.
 * - Validate environment variables against the schema.
 * - Construct and export a comprehensive `config` object.
 * - Export individual configuration values like `logLevel` and `environment` for convenience.
 *
 * @module src/config/index
 */
/**
 * Main application configuration object.
 * Aggregates settings from validated environment variables and `package.json`.
 */
export declare const config: {
    /** MCP server name. Env `MCP_SERVER_NAME` > `package.json` name > "mcp-ts-template". */
    mcpServerName: string;
    /** MCP server version. Env `MCP_SERVER_VERSION` > `package.json` version > "0.0.0". */
    mcpServerVersion: string;
    /** Logging level. From `MCP_LOG_LEVEL` env var. Default: "debug". */
    logLevel: string;
    /** Defines the logging output mode ('file' or 'stdout'). From `LOG_OUTPUT_MODE`. */
    logOutputMode: "file" | "stdout";
    /** Absolute path to the logs directory (if logOutputMode is 'file'). From `LOGS_DIR`. */
    logsPath: string | null;
    /** Runtime environment. From `NODE_ENV` env var. Default: "development". */
    environment: string;
    /** MCP transport type ('stdio' or 'http'). From `MCP_TRANSPORT_TYPE` env var. Default: "stdio". */
    mcpTransportType: "stdio" | "http";
    /** HTTP server port (if http transport). From `MCP_HTTP_PORT` env var. Default: 3010. */
    mcpHttpPort: number;
    /** HTTP server host (if http transport). From `MCP_HTTP_HOST` env var. Default: "127.0.0.1". */
    mcpHttpHost: string;
    /** Array of allowed CORS origins (http transport). From `MCP_ALLOWED_ORIGINS` (comma-separated). */
    mcpAllowedOrigins: string[] | undefined;
    /** Auth secret key (JWTs, http transport). From `MCP_AUTH_SECRET_KEY`. CRITICAL. */
    mcpAuthSecretKey: string | undefined;
    /** Auth mode ('jwt' or 'oauth'). From `MCP_AUTH_MODE`. */
    mcpAuthMode: "jwt" | "oauth";
    /** OAuth Issuer URL. From `OAUTH_ISSUER_URL`. */
    oauthIssuerUrl: string | undefined;
    /** OAuth Audience. From `OAUTH_AUDIENCE`. */
    oauthAudience: string | undefined;
    /** OAuth JWKS URI. From `OAUTH_JWKS_URI`. */
    oauthJwksUri: string | undefined;
    /** NCBI API Key. From `NCBI_API_KEY`. */
    ncbiApiKey: string | undefined;
    /** NCBI Tool Identifier. From `NCBI_TOOL_IDENTIFIER`. Defaults to server name/version. */
    ncbiToolIdentifier: string;
    /** NCBI Admin Email. From `NCBI_ADMIN_EMAIL`. */
    ncbiAdminEmail: string | undefined;
    /** NCBI Request Delay in MS. From `NCBI_REQUEST_DELAY_MS`. Dynamically set based on API key presence. */
    ncbiRequestDelayMs: number;
    /** NCBI Max Retries. From `NCBI_MAX_RETRIES`. */
    ncbiMaxRetries: number;
    /** OAuth Proxy configurations. Undefined if no related env vars are set. */
    oauthProxy: {
        authorizationUrl: string | undefined;
        tokenUrl: string | undefined;
        revocationUrl: string | undefined;
        issuerUrl: string | undefined;
        serviceDocumentationUrl: string | undefined;
        defaultClientRedirectUris: string[] | undefined;
    } | undefined;
};
/**
 * Configured logging level for the application.
 * Exported for convenience.
 */
export declare const logLevel: string;
/**
 * Configured runtime environment ("development", "production", etc.).
 * Exported for convenience.
 */
export declare const environment: string;