import { AfterViewInit, ElementRef, NgZone, OnDestroy, Renderer2 } from '@angular/core';
import { Platform } from '@angular/cdk/platform';
import { UntypedFormControl } from '@angular/forms';
import * as i0 from "@angular/core";
/**
 * Highly inspired by CdkTextareaAutosize
 * this directive allows to automatically adjust a paTextarea height according to its content.
 */
export declare class PaTextareaAutoHeightDirective implements AfterViewInit, OnDestroy {
    private _elementRef;
    private _platform;
    private _ngZone;
    private renderer;
    set enabled(value: any);
    get enabled(): boolean;
    set maxHeight(value: number | null | undefined);
    formControl?: UntypedFormControl;
    /** Class that should be applied to the textarea while it's being measured. */
    readonly _measuringClass: string;
    readonly _textarea: HTMLTextAreaElement;
    readonly _heightSafetynet = 4;
    private _previousHeight;
    private _previousValue?;
    private _maxHeight;
    private _enabled;
    private _autoSizingChanged$;
    constructor(_elementRef: ElementRef<HTMLElement>, _platform: Platform, _ngZone: NgZone, renderer: Renderer2);
    ngAfterViewInit(): void;
    ngOnDestroy(): void;
    /**
     * Resize the textarea to fit its content.
     */
    resizeToFitContent(): void;
    private _measureAutoHeight;
    private _toggleAutoHeight;
    private _trackChanges;
    static ɵfac: i0.ɵɵFactoryDeclaration<PaTextareaAutoHeightDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<PaTextareaAutoHeightDirective, "[paTextareaAutoHeight]", never, { "enabled": { "alias": "paTextareaAutoHeight"; "required": false; }; "maxHeight": { "alias": "paTextareaMaxHeight"; "required": false; }; "formControl": { "alias": "formControl"; "required": false; }; }, {}, never, never, false, never>;
}