export declare class XTextarea extends HTMLElement {
    #private;
    get value(): string;
    set value(val: string);
    addText(params: {
        text: string;
    }): void;
    setValue(params: {
        value: string;
        index: number;
    }): void;
    sendDelEvent(params: {
        action: number;
        length: number;
    }): void;
    select(): void;
    setSelectionRange(params: {
        selectionStart: number;
        selectionEnd: number;
    }): void;
}