/**
 * Transient, self-dismissing message on `.ran-player-gesture-flash` — the
 * show/hide-with-timer logic `core/gestures.ts`'s double-tap seek indicator
 * already needed, extracted so a second caller (the remote-playback-failure
 * notice in `core/chrome.ts`) doesn't hand-roll its own copy of the same
 * three lines. Position is caller-supplied via `className` (one of the
 * `ran-player-gesture-flash-{left,right,center}` modifiers in `index.less`)
 * since different callers anchor the message differently — seek flashes sit
 * over the half of the video that was tapped, a general notice sits centered.
 */
export interface FlashController {
    show: (text: string, className?: string) => void;
    destroy: () => void;
}
export declare function createFlashController(el: HTMLElement, visibleMs: number): FlashController;