import { ElementRef, NgZone, OnDestroy, OnInit, Renderer2 } from '@angular/core';
import { NgControl } from '@angular/forms';
import { Subscription } from 'rxjs';
import * as i0 from "@angular/core";
export declare class UsaCharacterCountDirective implements OnInit, OnDestroy {
    private element;
    private renderer2;
    private zone;
    private control;
    /** Directive's main input - max length of characters allowed */
    usaCharacterCount: number;
    /**
     * Id to use for character count message text. Will be auto-generated if not passed in
     */
    messageId: string;
    private readonly MESSAGE_CLASS;
    private readonly MESSAGE_INVALID_CLASS;
    /**
     * Subscription to form control's value changes if one exists
     * Allows us to unsubscribe during cleanup
     */
    valueSubscription: Subscription;
    /** Reference to character count text being displayed to users */
    characterCounterText: string;
    /**
     * Watch for resize event changes to the host element. We want to keep the character
     * counter's width attribute in line with host's width for resizable input
     */
    private _inputResizeObserver;
    /**
     * Reference to character counter message element. This will be created during init if
     * one with provided messageId does not already exist as sibling.
     */
    private _messageElement;
    constructor(element: ElementRef, renderer2: Renderer2, zone: NgZone, control: NgControl);
    ngOnInit(): void;
    ngOnDestroy(): void;
    /** Gets reference to span element that will be used to display character counter text. If one does not exists, it will be created
     * and attached as sibling to host form element
     */
    private getMessageElement;
    private inputEventHandler;
    /**
     * Sets character counter message based on current number of characters.
     * The message is appended as sibling element to the element this character count directive
     * is attached through reference of shared parent element.
     * @param currentLength
     */
    private setCharacterCountText;
    /**
     * Follows logic from USWDS' character counter's JS file so that messaging is consistent
     * @param currentLength
     * @param maxLength
     * @returns - string message to display based on current characters and max characters allowed
     */
    private generateCharacterCounterText;
    static ɵfac: i0.ɵɵFactoryDeclaration<UsaCharacterCountDirective, [null, null, null, { optional: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<UsaCharacterCountDirective, "[usaCharacterCount]", never, { "usaCharacterCount": { "alias": "usaCharacterCount"; "required": false; }; "messageId": { "alias": "messageId"; "required": false; }; }, {}, never, never, false, never>;
}