/**
 * Checks whether `element` is focusable or not.
 *
 * @memberof tabbable
 *
 * @example
 * import { isFocusable } from "reakit-utils";
 *
 * isFocusable(document.querySelector("input")); // true
 * isFocusable(document.querySelector("input[tabindex='-1']")); // true
 * isFocusable(document.querySelector("input[hidden]")); // false
 * isFocusable(document.querySelector("input:disabled")); // false
 */
export declare function isFocusable(element: Element): boolean;
/**
 * Returns all the focusable elements in `container`.
 *
 * @memberof tabbable
 *
 * @param {Element} container
 *
 * @returns {Element[]}
 */
export declare function getAllFocusableIn<T extends Element>(container: T): T[];
/**
 * Returns the first focusable element in `container`.
 *
 * @memberof tabbable
 *
 * @param {Element} container
 *
 * @returns {Element|null}
 */
export declare function getFirstFocusableIn<T extends Element>(container: T): T | null;
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