export interface EnvSyncWarning {
    file: string;
    customKeys: string[];
}
export interface EnvSyncReport {
    sourceRoot: string;
    targetRoot: string;
    copied: string[];
    merged: string[];
    skipped: string[];
    warnings: EnvSyncWarning[];
}
export declare function syncEnvTree(params: {
    sourceRoot: string;
    targetRoot: string;
    dryRun: boolean;
    logger?: (message: string) => void;
}): Promise<EnvSyncReport>;