/**
 * ConfigWatcher — watches a YAML config file for changes and emits
 * hot-reloadable config updates.
 *
 * Uses `fs.watch()` with debounce (500ms default) to avoid firing
 * on partial writes. Emits `reload` with the reloadable portion
 * of the config, or `error` on parse failure.
 */
import { EventEmitter } from 'node:events';
export interface HotReloadableConfig {
    maxIterations?: number;
    maxToolCalls?: number;
    ragQueryK?: number;
    toolUnavailableTtlMs?: number;
    showReasoning?: boolean;
    historyAutoSummarizeLimit?: number;
    queryExpansionEnabled?: boolean;
    toolResultCacheTtlMs?: number;
    sessionTokenBudget?: number;
    classificationEnabled?: boolean;
    vectorWeight?: number;
    keywordWeight?: number;
    prompts?: {
        system?: string;
        classifier?: string;
        reasoning?: string;
        ragTranslate?: string;
        historySummary?: string;
    };
    circuitBreaker?: {
        failureThreshold?: number;
        recoveryWindowMs?: number;
    };
    logDir?: string;
}
export interface ConfigWatcherOptions {
    /** Debounce interval in ms. Default: 500 */
    debounceMs?: number;
}
export declare class ConfigWatcher extends EventEmitter {
    private watcher;
    private debounceTimer;
    private readonly debounceMs;
    private readonly filePath;
    constructor(filePath: string, options?: ConfigWatcherOptions);
    /** Start watching the config file. */
    start(): void;
    /** Stop watching. */
    stop(): void;
    private _scheduleReload;
    private _reload;
    private _extractReloadable;
}
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