/**
 * Adapted from Angular Material Form Field Control
 * Source: https://github.com/angular/components/blob/main/src/material/form-field/form-field-control.ts
 *
 * @license MIT
 * Copyright (c) 2025 Google LLC
 * See LICENSE file in the project root for full license text.
 */
/** An interface which allows a control to work inside of a `M3eFormField`. */
export interface FormFieldControl extends HTMLElement {
    /** A value indicating whether the control is disabled. */
    disabled: boolean;
    /** The value of the control. */
    value?: unknown;
    /** A value indicating whether the control is required. */
    required?: boolean;
    /** A value indicated whether the content of the control is read-only. */
    readonly?: boolean;
    /** A value indicating whether the form field's label should try to float. */
    readonly shouldLabelFloat?: boolean;
    /** The error message that would be displayed if the user submits the form, or an empty string if no error message. */
    readonly validationMessage?: string;
    /** The `HTMLFormElement` associated with this element. */
    readonly form?: HTMLFormElement | null;
    /**
     * Handles the click event on the control's container.
     * @param {MouseEvent} event The `MouseEvent`.
     */
    onContainerClick?: (event: MouseEvent) => void;
    /**
     * Returns `true` if the element has no validity problems; otherwise,
     * returns `false`, fires an invalid event.
     */
    checkValidity?: () => boolean;
}
/**
 * Determines whether a value is a `FormFieldControl`.
 * @param {unknown} value The value to test.
 * @returns {value is FormFieldControl} A value indicating whether `value` is a `FormFieldControl`.
 */
export declare function isFormFieldControl(value: unknown): value is FormFieldControl;
/**
 * Locates the first `FormFieldControl` in a given slot.
 * @param {HTMLSlotElement} slot The slot in which to locate a `FormFieldControl`.
 * @returns {FormFieldControl | null} The `FormFieldControl` located in `slot`.
 */
export declare function findFormFieldControl(slot: HTMLSlotElement): FormFieldControl | null;
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