/**
 * ConfigService - Unified configuration management
 *
 * Loads configuration from:
 * 1. ~/.foundation/config.yaml (global)
 * 2. .foundation/config.yaml (project-level overrides)
 * 3. Environment variables
 *
 * Environment variable interpolation: ${VAR_NAME} in YAML values
 */
import type { FoundationConfig, DefaultsConfig, ProvidersConfig, RoleConfig, ArgusConfig, WorktreeConfig } from '../types/index.js';
export declare class ConfigService {
    private static instance;
    private config;
    private globalConfigPath;
    private initialized;
    private constructor();
    static getInstance(): ConfigService;
    /**
     * Initialize configuration by loading from files
     */
    init(): Promise<void>;
    /**
     * Get the full configuration
     */
    getConfig(): FoundationConfig;
    /**
     * Get defaults configuration
     */
    getDefaults(): DefaultsConfig;
    /**
     * Get providers configuration
     */
    getProviders(): ProvidersConfig;
    /**
     * Get a specific role configuration
     */
    getRole(role: string): RoleConfig | undefined;
    /**
     * Get all roles
     */
    getRoles(): Record<string, RoleConfig>;
    /**
     * Get Argus configuration
     */
    getArgusConfig(): ArgusConfig;
    /**
     * Get worktree configuration
     */
    getWorktreeConfig(): WorktreeConfig;
    /**
     * Get the global config directory path
     */
    getGlobalConfigDir(): string;
    /**
     * Get the project config directory path
     */
    getProjectConfigDir(): string;
    /**
     * Ensure global config directory exists
     */
    ensureGlobalConfigDir(): void;
    /**
     * Ensure project config directory exists
     */
    ensureProjectConfigDir(): void;
    /**
     * Save current config to global config file
     */
    saveGlobalConfig(): void;
    /**
     * Create default config file if it doesn't exist
     */
    createDefaultConfig(): void;
    /**
     * Load and parse a YAML file
     */
    private loadYamlFile;
    /**
     * Deep merge two configs, with source overriding target
     */
    private mergeConfig;
    /**
     * Recursively interpolate ${VAR_NAME} patterns with environment variables
     */
    private interpolateEnvVars;
}
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