import { FormControlController } from '../../internal/form.js';
import ShoelaceElement from '../../internal/shoelace-element.js';
import type { CSSResultGroup } from 'lit';
import type { ShoelaceFormControl } from '../../internal/shoelace-element.js';
/**
 * @summary Checkbox groups are used to group multiple [checkboxes](/components/checkbox) so they function as a single form control.
 * @documentation https://shoelace.style/components/checkbox-group
 * @status experimental
 * @since 2.0
 * @pattern stable
 * @figma ready
 *
 * @slot - The default slot where `<sl-checkbox>` elements are placed.
 * @slot label - The checkbox group's label. Required for proper accessibility. Alternatively, you can use the `label` attribute.
 * @slot label-tooltip - Used to add text that is displayed in a tooltip next to the label. Alternatively, you can use the `label-tooltip` attribute.
 * @slot help-text - Text that describes how to use the checkbox group. Alternatively, you can use the `help-text` attribute.
 *
 * @event sl-change - Emitted when the checkbox group's selected value changes.
 * @event sl-input - Emitted when the checkbox group receives user input.
 * @event sl-invalid - Emitted when the form control has been checked for validity and its constraints aren't satisfied.
 *
 * @csspart form-control - The form control that wraps the label, input, and help text.
 * @csspart form-control-label - The label's wrapper.
 * @csspart form-control-input - The input's wrapper.
 * @csspart form-control-help-text - The help text's wrapper.
 */
export default class SlCheckboxGroup extends ShoelaceElement implements ShoelaceFormControl {
    static styles: CSSResultGroup;
    protected readonly formControlController: FormControlController;
    private readonly hasSlotController;
    private customValidityMessage;
    private validationTimeout;
    defaultSlot: HTMLSlotElement;
    validationInput: HTMLInputElement;
    private errorMessage;
    /**
     * The checkbox group's label. Required for proper accessibility. If you need to display HTML, use the `label` slot instead. */
    label: string;
    /** Text that appears in a tooltip next to the label. If you need to display HTML in the tooltip, use the `label-tooltip` slot instead. */
    labelTooltip: string;
    /** The checkbox groups's help text. If you need to display HTML, use the `help-text` slot instead. */
    helpText: string;
    /** The name of the checkbox group, submitted as a name/value pair with form data. */
    name: string;
    /**
     * The current value of the checkbox group, submitted as a name/value pair with form data.
     */
    value: string[];
    /** The checkbox group's size. This size will be applied to all child checkboxes. */
    size: 'small' | 'medium' | 'large';
    /** The checkbox group's orientation. Changes the group's layout from the default (vertical) to horizontal. */
    horizontal: boolean;
    /** The checkbox group's style. Changes the group's style from the default (plain) style to the 'contained' style. This style will be applied to all child checkboxes. */
    contained: boolean;
    /**
     * 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 at least one child checkbox is checked before allowing the containing form to submit. */
    required: boolean;
    /** Gets the validity state object */
    get validity(): ValidityState;
    /** Gets the validation message */
    get validationMessage(): string;
    connectedCallback(): void;
    firstUpdated(): void;
    private getAllCheckboxes;
    private handleCheckboxClick;
    private handleInvalid;
    private syncCheckboxElements;
    private syncCheckboxes;
    private updateCheckboxValidity;
    private getValueFromCheckboxes;
    private addEventListenerToCheckboxes;
    handleSizeChange(): void;
    handleValueChange(): void;
    /** Checks for validity but does not show a validation message. Returns `true` when valid and `false` when invalid. */
    checkValidity(): boolean;
    /** Gets the associated form, if one exists. */
    getForm(): HTMLFormElement | null;
    /** Checks for validity and shows the browser's validation message if the control is invalid. */
    reportValidity(): boolean;
    /** Sets a custom validation message. Pass an empty string to restore validity. */
    setCustomValidity(message?: string): void;
    render(): import("lit-html").TemplateResult<1>;
}