/**
 * Adds a floating focus indicator to the page. This improves accessibility by providing
 * a visual indicator when using keyboard navigation. The indicator will briefly flash a
 * contrasting gray on the page field that has focus. This indicator will only display during
 * keyboard navigation, not mouse navigation.
 *
 * floatingFocus.lazy.css can be used to modify the appearance of the indicator.
 *
 * We must be careful not to inject styles until the DOM exists because this hook could be
 * called in a preload (such as an injected windowTitlebar). For the same reason, we compile
 * the styles using style-loader's lazy option and dynamically inject them rather than allowing
 * them to be injected as import side effects. This use case relies on floating-focus-a11y's unstyled
 * build: https://github.com/Q42/floating-focus-a11y#separate-stylesheet
 */
export declare const useFloatingFocus: () => void;
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