export interface FocusOptions {
    /**
     * enables focus
     */
    enabled?: boolean;
    /**
     * determines whether or not to assign `area-hidden="true"` to elements
     * outside of the trap
     */
    assignAriaHidden?: boolean;
    /**
     * focusable indicates whether or not to make the containing element
     * focusable
     */
    focusable?: boolean;
    /**
     * the element to focus upon.
     *
     * If the element is not tabbable and `focusable` is set to `true`, the
     * element with `use:focus` will be granted focus. If `focusable` is falsy,
     * the first tabbable child node will be granted focus.
     *
     * `string` values will be considered query selectors
     */
    element?: HTMLElement | string;
    /**
     * focusDelay can either be a number or a function which resolves with a promise
     * when it is appropriate to set focus on the target Element
     *
     * Defaults to `tick`
     */
    focusDelay?: number | (() => Promise<void>);
    /**
     * delay can either be a number or an async function which resolves
     * when it is appropriate to set assign tab indexes and ariaHidden (if applicable)
     *
     * Defaults to `tick`
     */
    delay?: number | (() => Promise<void>);
    /** A Boolean value indicating whether or not the browser should scroll the
     * document to bring the newly-focused element into view. A value of false
     * for preventScroll (the default) means that the browser will scroll the
     * element into view after focusing it. If preventScroll is set to true, no
     * scrolling will occur. */
    preventScroll?: boolean;
}
export interface FocusAction {
    update(enabled: boolean): void;
    update(opts: FocusOptions): void;
    destroy(): void;
}
export declare function focus(trap: HTMLElement, opts: FocusOptions | boolean): FocusAction;