/**
 * focusTrap.ts — PAT-061 compliant focus-trap helpers.
 *
 * Plain functions, NOT React hooks. No useXxx exports.
 * Single source of truth for focus-trap logic across all overlay organisms.
 *
 * Consumers: Sheet.tsx, Dialog.tsx, FilterPanel.tsx (incoming Wave 4).
 *
 * Rationale (D-172): The byte-identical 30-LOC block that previously lived
 * in both Sheet.tsx and Dialog.tsx is extracted here to eliminate duplication
 * and guarantee a single fix/update point for ARIA focus-trap behaviour.
 */
export declare const FOCUSABLE_SELECTOR = "button:not([disabled]), [href], input:not([disabled]), select:not([disabled]), textarea:not([disabled]), [tabindex]:not([tabindex=\"-1\"])";
/**
 * Returns all focusable, visible, non-aria-hidden elements within `container`.
 */
export declare function getFocusables(container: HTMLElement | null): HTMLElement[];
/**
 * Traps keyboard Tab / Shift+Tab focus cycling within `container`.
 * Must be attached to a `keydown` event listener on `document`.
 * No-ops on non-Tab keys so callers can pass all keydown events safely.
 */
export declare function trapFocus(e: KeyboardEvent, container: HTMLElement | null): void;
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