/**
 * Configuration Loader
 * Loads configuration from ~/.glm/config.json with environment variable fallback
 */
import { GlmConfig } from './types.js';
import type { ApiPlan } from './types.js';
/**
 * Load GLM configuration
 * Priority: Local config > Global config > Environment variables
 */
export declare function loadConfig(): GlmConfig;
/**
 * Check if debug mode is enabled
 */
export declare function isDebugEnabled(): boolean;
/**
 * Check if quality instructions are enabled
 */
export declare function isQualityEnabled(): boolean;
/**
 * Log debug message if debug mode is enabled
 */
export declare function debug(message: string, ...args: unknown[]): void;
/**
 * Check if verbose logging is enabled
 * Default: true
 */
export declare function isVerboseLogEnabled(): boolean;
/**
 * Check if usage logging is enabled
 * Default: true
 */
export declare function isLoggingEnabled(): boolean;
/**
 * Get GLM home directory path
 */
export declare function getGlmHomeDir(): string;
/**
 * Get local .glm directory path (if exists)
 */
export declare function getLocalGlmDir(): string | null;
/**
 * Get API plan from config
 */
export declare function getApiPlan(): ApiPlan;