import { ScalarType, Selector } from '..';
/**
 * Checks if array is empty or null or array at all
 * @param array
 */
export declare function isArrayEmptyOrNull(array: any[]): boolean;
/**
 * A simple sort array function with a convenient interface
 * @param array The array to process.
 * @param fields sorts order.
 * @public
 * @example
 * sort(array, 'name ASC', 'age DESC');
 */
export declare function sort(array: any[], ...fields: string[]): any[];
/**
 * Converts array of items to the object map. Where key selector can be defined.
 * @param array to be converted
 * @param keyField a selector or field name for a property name
 */
export declare function toObject(array: any[], keyField: string | string[] | Selector<any, string>): Record<string, any>;
/**
 * Convert array of items to into series array or series record.
 * @param array Array to be converted
 * @param propertyName optional parameter to define a property to be unpacked.
 * If it is string the array with values will be returned, otherwise an object with a list of series map
 */
export declare function toSeries(array: any[], propertyName?: string | string[]): Record<string, ScalarType[]> | ScalarType[];
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