/**
 * UI overlays for the piano roll canvas: tooltip and help panel.
 * Kept DOM-only to avoid coupling with Pixi internals.
 */
/**
 * Create and attach the note tooltip overlay to the canvas parent.
 * Returns the created tooltip div.
 */
export declare function initializeTooltipOverlay(canvas: HTMLCanvasElement, container?: HTMLElement): HTMLDivElement;
export interface HelpOverlay {
    button: HTMLButtonElement;
    panel: HTMLDivElement;
}
/** Create and attach a top-right help button with hover panel. */
export declare function initializeHelpOverlay(canvas: HTMLCanvasElement, container?: HTMLElement): HelpOverlay;
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