import { type CSSProperties } from "react";
/** Whether the newest in-thread consent presents as the bottom sheet (1-H):
 *  mobile width AND enough viewport height for the sheet to slide over the
 *  page without burying it. False falls back to the in-list ApprovalCard. */
export declare function useApprovalSheetPresentation(): boolean;
export interface MobileTakeover {
    /** True below the mobile breakpoint — append `fl-takeover` to the surface. */
    active: boolean;
    /** Pixels of visual viewport the virtual keyboard covers (0 when closed). */
    keyboardInset: number;
    /** Spread onto the takeover surface: carries `--fl-kb-inset` so the
     *  stylesheet can lift the composer above the virtual keyboard. Undefined
     *  when the takeover is inactive, leaving desktop styles untouched. */
    style: CSSProperties | undefined;
}
/**
 * Mobile takeover driver (ENG-228): the chrome surfaces (overlay panel, page,
 * palette) go full-bleed below 768px — the designed `.fl-takeover` mode. The
 * hook tracks the breakpoint via matchMedia and, while active, follows
 * `window.visualViewport` so the on-screen keyboard's height is published as
 * a `--fl-kb-inset` CSS variable on the surface. Environments without
 * matchMedia or visualViewport (SSR, jsdom, old WebViews) degrade to the
 * desktop presentation.
 */
export declare function useMobileTakeover(): MobileTakeover;