import { EventEmitter, OnInit, OnChanges, SimpleChanges } from '@angular/core';
import { RealsoftSort } from './sort';
import * as i0 from "@angular/core";
/**
 * Directive for automatically sorting alphabetical/string columns in a table.
 * This directive extends the base RealsoftSort functionality
 * and automatically handles string sorting.
 *
 * Usage:
 * <table realsoftAlphabeticalSort
 *        [data]="products"
 *        (sortedData)="sortedProducts = $event">
 *   <th realsoft-sort-header="name">Name</th>
 * </table>
 */
export declare class RealsoftAlphabeticalSort extends RealsoftSort implements OnInit, OnChanges {
    /**
     * The data array to be sorted.
     * When this changes or sort changes, the data will be automatically sorted.
     */
    data: any[];
    /**
     * Event emitted with the sorted data.
     * This fires whenever the sort changes or the input data changes.
     */
    sortedData: EventEmitter<any[]>;
    /**
     * Whether the comparison should be case-sensitive.
     * Default is case-insensitive sorting.
     */
    caseSensitive: boolean;
    /**
     * Locale to use for string comparison.
     * Uses the browser's default locale if not specified.
     */
    locale?: string | string[];
    /**
     * Whether to use natural sort order (e.g., "item2" before "item10").
     * This handles numeric portions within strings intelligently.
     */
    naturalSort: boolean;
    /**
     * How to handle null/undefined values.
     * 'first' - null values appear first
     * 'last' - null values appear last
     */
    nullHandling: 'first' | 'last';
    /**
     * Whether to trim whitespace before comparison.
     */
    trimWhitespace: boolean;
    /**
     * Whether to sort immediately when data is provided.
     * If false, data will only be sorted when user clicks a column header.
     */
    sortOnInit: boolean;
    ngOnInit(): void;
    ngOnChanges(changes?: SimpleChanges): void;
    /**
     * Performs the actual sorting and emits the result
     */
    private performSort;
    /**
     * Compares two string values based on sort direction
     */
    private compareAlphabetical;
    /**
     * Helper to get nested object properties using dot notation
     */
    private getNestedProperty;
    /**
     * Public method to trigger a re-sort with current settings
     */
    resort(): void;
    /**
     * Public method to clear sorting and return original data
     */
    clearSort(): void;
    /**
     * Utility method to filter and sort strings that start with a specific letter
     */
    filterByFirstLetter(letter: string): any[];
    static ɵfac: i0.ɵɵFactoryDeclaration<RealsoftAlphabeticalSort, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<RealsoftAlphabeticalSort, "[realsoftAlphabeticalSort]", ["realsoftAlphabeticalSort"], { "data": { "alias": "data"; "required": false; }; "caseSensitive": { "alias": "caseSensitive"; "required": false; }; "locale": { "alias": "locale"; "required": false; }; "naturalSort": { "alias": "naturalSort"; "required": false; }; "nullHandling": { "alias": "nullHandling"; "required": false; }; "trimWhitespace": { "alias": "trimWhitespace"; "required": false; }; "sortOnInit": { "alias": "sortOnInit"; "required": false; }; }, { "sortedData": "sortedData"; }, never, never, true, never>;
}