import { Selector } from '../types';
/**
 * leftJoin returns all elements from the left array (leftArray), and the matched elements from the right array (rightArray).
 * The result is NULL from the right side, if there is no match.
 * @param leftArray array for left side in a join
 * @param rightArray array for right side in a join
 * @param leftKey A key from left side array. What can be as a fieldName, multiple fields or key Selector
 * @param rightKey A key from right side array. what can be as a fieldName, multiple fields or key Selector
 * @param resultSelector A callback function that returns result value
 */
export declare function leftJoin(leftArray: any[], rightArray: any[], leftKeySelector: string | string[] | Selector<any, string>, rightKeySelector: string | string[] | Selector<any, string>, resultSelector: (leftItem: any, rightItem: any) => any): any[];
/**
 * innerJoin - Joins two arrays together by selecting elements that have matching values in both arrays.
 * If there are elements in any array that do not have matches in other array, these elements will not be shown!
 * @param leftArray array for left side in a join
 * @param rightArray array for right side in a join
 * @param leftKey A key from left side array. What can be as a fieldName, multiple fields or key Selector
 * @param rightKey A key from right side array. what can be as a fieldName, multiple fields or key Selector
 * @param resultSelector A callback function that returns result value
 */
export declare function innerJoin(leftArray: any[], rightArray: any[], leftKey: string | string[] | Selector<any, string>, rightKey: string | string[] | Selector<any, string>, resultSelector: (leftItem: any, rightItem: any) => any): any[];
/**
 * fullJoin returns all elements from the left array (leftArray), and all elements from the right array (rightArray).
 * The result is NULL from the right/left side, if there is no match.
 * @param leftArray array for left side in a join
 * @param rightArray array for right side in a join
 * @param leftKey A key from left side array. What can be as a fieldName, multiple fields or key Selector
 * @param rightKey A key from right side array. what can be as a fieldName, multiple fields or key Selector
 * @param resultSelector A callback function that returns result value
 */
export declare function fullJoin(leftArray: any[], rightArray: any[], leftKey: string | string[] | Selector<any, string>, rightKey: string | string[] | Selector<any, string>, resultSelector: (leftItem: any, rightItem: any) => any): any[];
/**
 * merges elements from two arrays. It appends source element or overrides to target array based on matching keys provided
 * @param targetArray target array
 * @param sourceArray source array
 * @param targetKey tartget key field, arry of fields or field serlector
 * @param sourceKey source key field, arry of fields or field serlector
 */
export declare function merge(targetArray: any[], sourceArray: any[], targetKey: string | string[] | Selector<any, string>, sourceKey: string | string[] | Selector<any, string>): any[];
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