import { AttrState, FormTextareaParams, FormItem } from './help';
export declare class FormTextarea implements FormItem<string> {
    private config;
    elementRef: HTMLDivElement;
    name: string;
    private input;
    private sub?;
    private readonly btn?;
    private readonly feedbackEle;
    constructor(config: FormTextareaParams);
    reset(): void;
    update(value?: any): void;
    getAttr(): AttrState<string>;
    validate(): boolean;
    private uploaded;
}