import { ObjectLiteral } from "../common/ObjectLiteral";
export declare class OrmUtils {
    static splitClassesAndStrings<T>(clsesAndStrings: T[] | string[]): [T[], string[]];
    static groupBy<T, R>(array: T[], propertyCallback: (item: T) => R): {
        id: R;
        items: T[];
    }[];
    static isObject(item: any): boolean;
    /**
     * Deep Object.assign.
     *
     * @see http://stackoverflow.com/a/34749873
     */
    static mergeDeep(target: any, ...sources: any[]): any;
    /**
     * Deep compare objects.
     *
     * @see http://stackoverflow.com/a/1144249
     */
    static deepCompare(...args: any[]): boolean;
    /**
     * Transforms given value into boolean value.
     */
    static toBoolean(value: any): boolean;
    /**
     * Composes an object from the given array of keys and values.
     */
    static zipObject(keys: any[], values: any[]): ObjectLiteral;
}