import { type AuditLogger } from './audit-log.js';
export interface ConfigGuardServerFields {
    host: string;
    port: number;
    auth: {
        username: string;
        password?: string;
    };
}
export interface ConfigBackup {
    path: string;
    timestamp: number;
    sha256: string;
}
export interface ConfigGuardIO {
    readFile?: (filePath: string) => Promise<string>;
    writeFile?: (filePath: string, content: string) => Promise<void>;
    rename?: (fromPath: string, toPath: string) => Promise<void>;
    mkdir?: (dirPath: string) => Promise<void>;
    exists?: (filePath: string) => Promise<boolean>;
}
export interface ApplyConfigGuardOptions {
    configPath: string;
    serverFields: ConfigGuardServerFields;
    level2Template?: Record<string, unknown>;
    audit?: AuditLogger;
    io?: ConfigGuardIO;
}
export interface ApplyConfigGuardResult {
    backup: ConfigBackup;
    appliedLevel: 'level1' | 'level2';
}
export interface RollbackConfigOptions {
    configPath: string;
    backup: ConfigBackup;
    audit?: AuditLogger;
    io?: ConfigGuardIO;
}
export declare function applyConfigGuardWithFallback(options: ApplyConfigGuardOptions): Promise<ApplyConfigGuardResult>;
export declare function rollbackConfigFromBackup(options: RollbackConfigOptions): Promise<void>;
export declare function createConfigBackup(configPath: string, customIO?: ConfigGuardIO): Promise<ConfigBackup>;
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