import { IData } from "./db";
import { ISigned } from './user';
import { Event } from './events';
export declare const events: {
    dataChangesIngested: Event<{
        updatedData: IData;
        dataBeforeChange?: IData;
        dataChange: IDataChange;
    }>;
};
export type IChange = [string, any?];
export declare function isObj(x: any): boolean;
export declare function isLeaf(x: unknown): boolean;
export declare function isEmptyObj(x: any): x is {};
export declare function isEmptyArray(x: any): x is [];
export declare function getChanges(objFrom: any, objTo: any): IChange[];
export declare function applyChanges(toObj: any, changes: IChange[]): any;
export interface IDataChange extends ISigned {
    id: string;
    group: string;
    subject: string;
    modified: number;
    changes: IChange[];
    subjectDeleted?: boolean;
}
export declare function getDataChange<T extends IData, U extends IData>(dataFrom?: T, dataTo?: U): IDataChange;
export declare function validateDataChange(dataChange: IDataChange, dbData?: IData): Promise<IData>;
export declare function ingestChange(dataChange: IDataChange, dbData?: IData, skipValidation?: boolean): Promise<IData>;
export declare function commitChange<T extends IData>(data: T, options?: {
    preserveModified?: boolean;
}): Promise<IDataChange[]>;
export declare function deleteData(id: string): Promise<IDataChange>;