/**
 * Configuration validation and construction helpers.
 * Extracted from defaults.ts for max-lines compliance.
 */
import type { BabysitterConfig, ConfigValidationResult, LogLevel } from "./defaults";
/**
 * Retrieves configuration with environment variable overrides merged in.
 */
export declare function getConfig(overrides?: Partial<BabysitterConfig>): BabysitterConfig;
/**
 * Validates a configuration object for correctness.
 */
export declare function validateConfig(config: BabysitterConfig): ConfigValidationResult;
/**
 * Creates a frozen copy of the defaults for safe external use.
 */
export declare function getDefaults(): Readonly<BabysitterConfig>;
/**
 * Checks if a value is a valid log level.
 */
export declare function isValidLogLevel(value: unknown): value is LogLevel;
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