/**
 * File-based configuration source
 */
import type { ConfigSource } from '../types/index.js';
export declare abstract class FileConfigSource implements ConfigSource {
    readonly name: string;
    readonly priority: number;
    protected readonly filePath: string;
    private watcher?;
    constructor(filePath: string, name?: string, priority?: number);
    load(): Promise<Record<string, unknown>>;
    save(config: Record<string, unknown>): Promise<void>;
    watch(callback: (config: Record<string, unknown>) => void): () => void;
    protected abstract parseContent(content: string): Record<string, unknown>;
    protected abstract stringifyContent(config: Record<string, unknown>): string;
}
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