/**
 * @fileoverview Config loader and defaults merging.
 *
 * Search order: explicit `--config <path>`, then `textavia.config.json`,
 * `.textaviarc`, `.textaviarc.json` in the current working directory. Config
 * files are external input and validated with the schemas package.
 */
import { type TextaviaConfig } from '@textavia/core';
/** Built-in defaults (lowest precedence). */
export declare const BUILTIN_DEFAULTS: Readonly<Record<string, unknown>>;
/** Returns a parsed config or null when no config file is found. */
export declare function loadConfig(cwd: string, explicitPath?: string): Promise<TextaviaConfig | null>;
/**
 * Merges built-in defaults, config defaults, and a tool-specific defaults
 * override into a single defaults map. Explicit CLI flags are applied by the
 * caller (they are highest precedence) because the caller knows which flags
 * were present.
 */
export declare function mergeDefaults(config: TextaviaConfig | null, toolDefaults?: Readonly<Record<string, unknown>>): Record<string, unknown>;
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