import type { Nullable } from "../types/index.js";
/**
 * Sets the maximum supported viewport dimensions. Called by browser initialization after detecting the display size and accounting for browser chrome.
 * @param width - Maximum viewport width in pixels.
 * @param height - Maximum viewport height in pixels.
 */
export declare function setMaxSupportedViewport(width: number, height: number): void;
/**
 * Returns the maximum supported viewport dimensions, or null if display detection has not yet completed. Callers should fall back to the configured preset when null
 * is returned.
 * @returns The maximum supported viewport dimensions, or null before detection.
 */
export declare function getMaxSupportedViewport(): Nullable<{
    height: number;
    width: number;
}>;
/**
 * Sets the browser chrome dimensions. Called by browser initialization after measuring the difference between outer and inner window dimensions.
 * @param width - Chrome width in pixels (typically 0 or small for window borders).
 * @param height - Chrome height in pixels (title bar + toolbar).
 */
export declare function setBrowserChrome(width: number, height: number): void;
/**
 * Returns the cached browser chrome dimensions, or null if display detection has not yet completed.
 * @returns The browser chrome dimensions, or null before detection.
 */
export declare function getBrowserChrome(): Nullable<{
    height: number;
    width: number;
}>;