import NileElement from '../internal/nile-element';
import type { CSSResultGroup, PropertyValues } from 'lit';
/**
 * @summary Radio groups are used to group multiple [radios](/components/radio) or [radio buttons](/components/radio-button) so they function as a single form control.
 *
 * @dependency nile-button-group
 *
 * @slot - The default slot where `<nile-radio>` or `<nile-radio-button>` elements are placed.
 * @slot label - The radio group's label. Required for proper accessibility. Alternatively, you can use the `label`
 *  attribute.
 *
 * @event change - Emitted when the radio group's selected value changes.
 * @event input - Emitted when the radio group receives user input.
 * @event invalid - Emitted when the form control has been checked for validity and its constraints aren't satisfied.
 * @csspart button-group - The button group that wraps radio buttons.
 * @csspart button-group__base - The button group's `base` part.
 */
export declare class NileRadioGroup extends NileElement {
    static styles: CSSResultGroup;
    private readonly hasSlotController;
    private customValidityMessage;
    defaultSlot: HTMLSlotElement;
    private hasButtonGroup;
    defaultValue: string;
    /**
     * The radio group's label. Required for proper accessibility. If you need to display HTML, use the `label` slot
     * instead.
     */
    label: string;
    /** The name of the radio group, submitted as a name/value pair with form data. */
    name: string;
    /** The current value of the radio group, submitted as a name/value pair with form data. */
    value: string;
    /**
     * By default, form controls are associated with the nearest containing `<form>` element. This attribute allows you
     * to place the form control outside of a form and associate it with the form that has this `id`. The form must be in
     * the same document or shadow root for this to work.
     */
    form: string;
    /** Ensures a child radio is checked before allowing the containing form to submit. */
    required: boolean;
    /** Used to show radio in inline or not */
    labelInline: boolean;
    /** Used to disabled or not */
    disabled: boolean;
    helpText: string;
    errorMessage: string;
    /** The radio's labelborder for whole gp. */
    islabelborder: boolean;
    /** Allow the radio to be unchecked. */
    allowUncheckGroup: boolean;
    connectedCallback(): void;
    disconnectedCallback(): void;
    private getAllRadios;
    private handleRadioClick;
    protected updated(changedProperties: PropertyValues): void;
    handleDisabledChange(): void;
    private handleInitialDisabledState;
    private handleKeyDown;
    private handleLabelClick;
    private handleSlotChange;
    private updateCheckedRadio;
    handleValueChange(): void;
    render(): import("lit-html").TemplateResult<1>;
}
export default NileRadioGroup;
declare global {
    interface HTMLElementTagNameMap {
        'nile-radio-group': NileRadioGroup;
    }
}